diff --git a/first week/Minesweeper Game/Minesweeper Game.md b/first week/Minesweeper Game/Minesweeper Game.md
new file mode 100644
index 0000000..45f9eae
--- /dev/null
+++ b/first week/Minesweeper Game/Minesweeper Game.md	
@@ -0,0 +1,44 @@
+# Minesweeper Game
+
+## 题目描述
+
+扫雷游戏是一款十分经典的单机小游戏。在 n 行 m 列的雷区中有一些格子含有地雷（称之为地雷格），其他格子不含地雷（称之为非地雷格）。玩家翻开一个非地雷格时，该格将会出现一个数字——提示周围格子中有多少个是地雷格。游戏的目标是在不翻出任何地雷格的条件下，找出所有的非地雷格。
+
+现在给出 n 行 m 列的雷区中的地雷分布，要求计算出每个非地雷格周围的地雷格数。
+
+注：一个格子的周围格子包括其上、下、左、右、左上、右上、左下、右下八个方向上与之直接相邻的格子。
+
+## 输入格式
+
+第一行是用一个空格隔开的两个整数 n 和 m，分别表示雷区的行数和列数。
+
+接下来 n 行，每行 m 个字符，描述了雷区中的地雷分布情况。字符 * 表示相应格子是地雷格，字符 ? 表示相应格子是非地雷格。相邻字符之间无分隔符。
+
+## 输出格式
+
+输出文件包含 n 行，每行 m 个字符，描述整个雷区。用 * 表示地雷格，用周围的地雷个数表示非地雷格。相邻字符之间无分隔符。
+
+## 输入输出样例
+
+### 输入
+
+```
+3 3
+*??
+???
+?*?
+```
+
+### 输出
+
+```
+*10
+221
+1*1
+```
+
+
+
+## 说明/提示
+
+对于 100% 的数据，1≤n≤100, 1≤m≤100。
diff --git a/first week/Minesweeper Game/test_cases/test1.in b/first week/Minesweeper Game/test_cases/test1.in
new file mode 100644
index 0000000..956211f
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test1.in	
@@ -0,0 +1,4 @@
+3 3
+*??
+???
+?*?
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test1.out b/first week/Minesweeper Game/test_cases/test1.out
new file mode 100644
index 0000000..96a4a33
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test1.out	
@@ -0,0 +1,3 @@
+*10
+221
+1*1
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test10.in b/first week/Minesweeper Game/test_cases/test10.in
new file mode 100644
index 0000000..cdc90ae
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test10.in	
@@ -0,0 +1,2 @@
+1 8
+?*??*???
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test10.out b/first week/Minesweeper Game/test_cases/test10.out
new file mode 100644
index 0000000..e985645
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test10.out	
@@ -0,0 +1 @@
+1*11*100
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test11.in b/first week/Minesweeper Game/test_cases/test11.in
new file mode 100644
index 0000000..25d3fd2
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test11.in	
@@ -0,0 +1,6 @@
+5 6
+??*???
+?*??*?
+??*???
+*????*
+??????
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test11.out b/first week/Minesweeper Game/test_cases/test11.out
new file mode 100644
index 0000000..52e4e3f
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test11.out	
@@ -0,0 +1,5 @@
+12*211
+1*33*1
+23*222
+*2111*
+110011
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test2.in b/first week/Minesweeper Game/test_cases/test2.in
new file mode 100644
index 0000000..b6f38f4
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test2.in	
@@ -0,0 +1,3 @@
+2 3
+?*?
+*??
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test2.out b/first week/Minesweeper Game/test_cases/test2.out
new file mode 100644
index 0000000..69e6402
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test2.out	
@@ -0,0 +1,2 @@
+2*1
+*21
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test3.in b/first week/Minesweeper Game/test_cases/test3.in
new file mode 100644
index 0000000..20d04c9
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test3.in	
@@ -0,0 +1,2 @@
+1 1
+*
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test3.out b/first week/Minesweeper Game/test_cases/test3.out
new file mode 100644
index 0000000..f59ec20
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test3.out	
@@ -0,0 +1 @@
+*
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test4.in b/first week/Minesweeper Game/test_cases/test4.in
new file mode 100644
index 0000000..1cb7825
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test4.in	
@@ -0,0 +1,2 @@
+1 1
+?
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test4.out b/first week/Minesweeper Game/test_cases/test4.out
new file mode 100644
index 0000000..c227083
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test4.out	
@@ -0,0 +1 @@
+0
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test5.in b/first week/Minesweeper Game/test_cases/test5.in
new file mode 100644
index 0000000..d742862
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test5.in	
@@ -0,0 +1,3 @@
+2 2
+??
+??
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test5.out b/first week/Minesweeper Game/test_cases/test5.out
new file mode 100644
index 0000000..7afe504
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test5.out	
@@ -0,0 +1,2 @@
+00
+00
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test6.in b/first week/Minesweeper Game/test_cases/test6.in
new file mode 100644
index 0000000..8813a94
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test6.in	
@@ -0,0 +1,3 @@
+2 2
+**
+**
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test6.out b/first week/Minesweeper Game/test_cases/test6.out
new file mode 100644
index 0000000..cc20c6e
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test6.out	
@@ -0,0 +1,2 @@
+**
+**
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test7.in b/first week/Minesweeper Game/test_cases/test7.in
new file mode 100644
index 0000000..874b437
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test7.in	
@@ -0,0 +1,5 @@
+4 4
+?*??
+*???
+??*?
+???*
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test7.out b/first week/Minesweeper Game/test_cases/test7.out
new file mode 100644
index 0000000..2fbdb83
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test7.out	
@@ -0,0 +1,4 @@
+2*10
+*321
+12*2
+012*
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test8.in b/first week/Minesweeper Game/test_cases/test8.in
new file mode 100644
index 0000000..6c83740
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test8.in	
@@ -0,0 +1,4 @@
+3 5
+??*??
+?*??*
+*????
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test8.out b/first week/Minesweeper Game/test_cases/test8.out
new file mode 100644
index 0000000..a9f78f1
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test8.out	
@@ -0,0 +1,3 @@
+12*21
+2*22*
+*2111
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test9.in b/first week/Minesweeper Game/test_cases/test9.in
new file mode 100644
index 0000000..0c7f277
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test9.in	
@@ -0,0 +1,6 @@
+5 1
+?
+*
+?
+*
+?
\ No newline at end of file
diff --git a/first week/Minesweeper Game/test_cases/test9.out b/first week/Minesweeper Game/test_cases/test9.out
new file mode 100644
index 0000000..330f94c
--- /dev/null
+++ b/first week/Minesweeper Game/test_cases/test9.out	
@@ -0,0 +1,5 @@
+1
+*
+2
+*
+1
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/Natural Number Splitting.md b/first week/Natural Number Splitting/Natural Number Splitting.md
new file mode 100644
index 0000000..0a5e82a
Binary files /dev/null and b/first week/Natural Number Splitting/Natural Number Splitting.md differ
diff --git a/first week/Natural Number Splitting/test_cases/test1.in b/first week/Natural Number Splitting/test_cases/test1.in
new file mode 100644
index 0000000..c793025
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test1.in	
@@ -0,0 +1 @@
+7
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test1.out b/first week/Natural Number Splitting/test_cases/test1.out
new file mode 100644
index 0000000..da11878
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test1.out	
@@ -0,0 +1,14 @@
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\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test10.in b/first week/Natural Number Splitting/test_cases/test10.in
new file mode 100644
index 0000000..ca7bf83
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test10.in	
@@ -0,0 +1 @@
+13
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test10.out b/first week/Natural Number Splitting/test_cases/test10.out
new file mode 100644
index 0000000..7071560
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test10.out	
@@ -0,0 +1,100 @@
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\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test2.in b/first week/Natural Number Splitting/test_cases/test2.in
new file mode 100644
index 0000000..e440e5c
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test2.in	
@@ -0,0 +1 @@
+3
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test2.out b/first week/Natural Number Splitting/test_cases/test2.out
new file mode 100644
index 0000000..44cbdec
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test2.out	
@@ -0,0 +1,2 @@
+1+1+1
+1+2
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test3.in b/first week/Natural Number Splitting/test_cases/test3.in
new file mode 100644
index 0000000..301160a
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test3.in	
@@ -0,0 +1 @@
+8
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test3.out b/first week/Natural Number Splitting/test_cases/test3.out
new file mode 100644
index 0000000..530cef0
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test3.out	
@@ -0,0 +1,21 @@
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\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test4.in b/first week/Natural Number Splitting/test_cases/test4.in
new file mode 100644
index 0000000..62f9457
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test4.in	
@@ -0,0 +1 @@
+6
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test4.out b/first week/Natural Number Splitting/test_cases/test4.out
new file mode 100644
index 0000000..455f7e7
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test4.out	
@@ -0,0 +1,10 @@
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\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test5.in b/first week/Natural Number Splitting/test_cases/test5.in
new file mode 100644
index 0000000..7813681
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test5.in	
@@ -0,0 +1 @@
+5
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test5.out b/first week/Natural Number Splitting/test_cases/test5.out
new file mode 100644
index 0000000..f46da38
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test5.out	
@@ -0,0 +1,6 @@
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\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test6.in b/first week/Natural Number Splitting/test_cases/test6.in
new file mode 100644
index 0000000..9a03714
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test6.in	
@@ -0,0 +1 @@
+10
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test6.out b/first week/Natural Number Splitting/test_cases/test6.out
new file mode 100644
index 0000000..17fe61c
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test6.out	
@@ -0,0 +1,41 @@
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\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test7.in b/first week/Natural Number Splitting/test_cases/test7.in
new file mode 100644
index 0000000..9d60796
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test7.in	
@@ -0,0 +1 @@
+11
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test7.out b/first week/Natural Number Splitting/test_cases/test7.out
new file mode 100644
index 0000000..e1ef73c
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test7.out	
@@ -0,0 +1,55 @@
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+1+1+4+5
+1+1+9
+1+2+2+2+2+2
+1+2+2+2+4
+1+2+2+3+3
+1+2+2+6
+1+2+3+5
+1+2+4+4
+1+2+8
+1+3+3+4
+1+3+7
+1+4+6
+1+5+5
+1+10
+2+2+2+2+3
+2+2+2+5
+2+2+3+4
+2+2+7
+2+3+3+3
+2+3+6
+2+4+5
+2+9
+3+3+5
+3+4+4
+3+8
+4+7
+5+6
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test8.in b/first week/Natural Number Splitting/test_cases/test8.in
new file mode 100644
index 0000000..3cacc0b
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test8.in	
@@ -0,0 +1 @@
+12
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test8.out b/first week/Natural Number Splitting/test_cases/test8.out
new file mode 100644
index 0000000..3de0a1b
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test8.out	
@@ -0,0 +1,76 @@
+1+1+1+1+1+1+1+1+1+1+1+1
+1+1+1+1+1+1+1+1+1+1+2
+1+1+1+1+1+1+1+1+1+3
+1+1+1+1+1+1+1+1+2+2
+1+1+1+1+1+1+1+1+4
+1+1+1+1+1+1+1+2+3
+1+1+1+1+1+1+1+5
+1+1+1+1+1+1+2+2+2
+1+1+1+1+1+1+2+4
+1+1+1+1+1+1+3+3
+1+1+1+1+1+1+6
+1+1+1+1+1+2+2+3
+1+1+1+1+1+2+5
+1+1+1+1+1+3+4
+1+1+1+1+1+7
+1+1+1+1+2+2+2+2
+1+1+1+1+2+2+4
+1+1+1+1+2+3+3
+1+1+1+1+2+6
+1+1+1+1+3+5
+1+1+1+1+4+4
+1+1+1+1+8
+1+1+1+2+2+2+3
+1+1+1+2+2+5
+1+1+1+2+3+4
+1+1+1+2+7
+1+1+1+3+3+3
+1+1+1+3+6
+1+1+1+4+5
+1+1+1+9
+1+1+2+2+2+2+2
+1+1+2+2+2+4
+1+1+2+2+3+3
+1+1+2+2+6
+1+1+2+3+5
+1+1+2+4+4
+1+1+2+8
+1+1+3+3+4
+1+1+3+7
+1+1+4+6
+1+1+5+5
+1+1+10
+1+2+2+2+2+3
+1+2+2+2+5
+1+2+2+3+4
+1+2+2+7
+1+2+3+3+3
+1+2+3+6
+1+2+4+5
+1+2+9
+1+3+3+5
+1+3+4+4
+1+3+8
+1+4+7
+1+5+6
+1+11
+2+2+2+2+2+2
+2+2+2+2+4
+2+2+2+3+3
+2+2+2+6
+2+2+3+5
+2+2+4+4
+2+2+8
+2+3+3+4
+2+3+7
+2+4+6
+2+5+5
+2+10
+3+3+3+3
+3+3+6
+3+4+5
+3+9
+4+4+4
+4+8
+5+7
+6+6
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test9.in b/first week/Natural Number Splitting/test_cases/test9.in
new file mode 100644
index 0000000..f11c82a
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test9.in	
@@ -0,0 +1 @@
+9
\ No newline at end of file
diff --git a/first week/Natural Number Splitting/test_cases/test9.out b/first week/Natural Number Splitting/test_cases/test9.out
new file mode 100644
index 0000000..5e81a31
--- /dev/null
+++ b/first week/Natural Number Splitting/test_cases/test9.out	
@@ -0,0 +1,29 @@
+1+1+1+1+1+1+1+1+1
+1+1+1+1+1+1+1+2
+1+1+1+1+1+1+3
+1+1+1+1+1+2+2
+1+1+1+1+1+4
+1+1+1+1+2+3
+1+1+1+1+5
+1+1+1+2+2+2
+1+1+1+2+4
+1+1+1+3+3
+1+1+1+6
+1+1+2+2+3
+1+1+2+5
+1+1+3+4
+1+1+7
+1+2+2+2+2
+1+2+2+4
+1+2+3+3
+1+2+6
+1+3+5
+1+4+4
+1+8
+2+2+2+3
+2+2+5
+2+3+4
+2+7
+3+3+3
+3+6
+4+5
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/Secret Message Decoding.md b/first week/Secret Message Decoding/Secret Message Decoding.md
new file mode 100644
index 0000000..ae4b149
--- /dev/null
+++ b/first week/Secret Message Decoding/Secret Message Decoding.md	
@@ -0,0 +1,30 @@
+# Secret Message Decoding
+
+## 题目描述
+
+你是一名网络安全工程师，在一次调查中，你发现黑客组织“暗影”在通信时使用了一种特殊的加密方式。他们不仅对消息内容加密，还会对每条消息附带的时间戳进行反转处理，以干扰追踪。
+
+现在，你截获了一批数据包，每个数据包都包含一个被反转过的数字时间戳（以字符串形式传输）。你的任务是编写一个程序，将这些被反转的时间戳恢复成正常顺序，以便分析攻击发生的确切时间。
+
+## 输入格式
+
+输入为一个字符串 \( S \)（长度 ≤ 1000），可能包含大小写字母、数字、空格和标点符号。
+
+## 输出格式
+
+输出一个字符串，为输入字符串 \( S \) 的完全反转。
+
+## 输入输出样例
+
+### 输入
+
+```
+Hello, World!
+```
+
+### 输出
+
+```
+!dlroW ,olleH
+```
+
diff --git a/first week/Secret Message Decoding/test_cases/test1.in b/first week/Secret Message Decoding/test_cases/test1.in
new file mode 100644
index 0000000..b45ef6f
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test1.in	
@@ -0,0 +1 @@
+Hello, World!
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test1.out b/first week/Secret Message Decoding/test_cases/test1.out
new file mode 100644
index 0000000..68c4383
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test1.out	
@@ -0,0 +1 @@
+!dlroW ,olleH
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test10.in b/first week/Secret Message Decoding/test_cases/test10.in
new file mode 100644
index 0000000..ce01e3c
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test10.in	
@@ -0,0 +1 @@
+1018zrgyhz
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test10.out b/first week/Secret Message Decoding/test_cases/test10.out
new file mode 100644
index 0000000..6f556ee
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test10.out	
@@ -0,0 +1 @@
+zhygrz8101
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test11.in b/first week/Secret Message Decoding/test_cases/test11.in
new file mode 100644
index 0000000..d57c668
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test11.in	
@@ -0,0 +1 @@
+If You?!
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test11.out b/first week/Secret Message Decoding/test_cases/test11.out
new file mode 100644
index 0000000..a131ce1
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test11.out	
@@ -0,0 +1 @@
+!?uoY fI
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test2.in b/first week/Secret Message Decoding/test_cases/test2.in
new file mode 100644
index 0000000..303fd77
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test2.in	
@@ -0,0 +1 @@
+202312251430
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test2.out b/first week/Secret Message Decoding/test_cases/test2.out
new file mode 100644
index 0000000..3557db7
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test2.out	
@@ -0,0 +1 @@
+034152213202
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test3.in b/first week/Secret Message Decoding/test_cases/test3.in
new file mode 100644
index 0000000..af3a357
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test3.in	
@@ -0,0 +1 @@
+AB4
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test3.out b/first week/Secret Message Decoding/test_cases/test3.out
new file mode 100644
index 0000000..87c1e3d
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test3.out	
@@ -0,0 +1 @@
+4BA
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test4.in b/first week/Secret Message Decoding/test_cases/test4.in
new file mode 100644
index 0000000..43836c8
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test4.in	
@@ -0,0 +1 @@
+madam
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test4.out b/first week/Secret Message Decoding/test_cases/test4.out
new file mode 100644
index 0000000..43836c8
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test4.out	
@@ -0,0 +1 @@
+madam
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test5.in b/first week/Secret Message Decoding/test_cases/test5.in
new file mode 100644
index 0000000..ed2c580
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test5.in	
@@ -0,0 +1 @@
+a b c
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test5.out b/first week/Secret Message Decoding/test_cases/test5.out
new file mode 100644
index 0000000..adf2c92
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test5.out	
@@ -0,0 +1 @@
+c b a
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test6.in b/first week/Secret Message Decoding/test_cases/test6.in
new file mode 100644
index 0000000..d5978d7
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test6.in	
@@ -0,0 +1 @@
+ABC123!@#
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test6.out b/first week/Secret Message Decoding/test_cases/test6.out
new file mode 100644
index 0000000..707c5db
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test6.out	
@@ -0,0 +1 @@
+#@!321CBA
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test7.in b/first week/Secret Message Decoding/test_cases/test7.in
new file mode 100644
index 0000000..ff3bb63
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test7.in	
@@ -0,0 +1 @@
+The quick brown fox jumps over the lazy dog
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test7.out b/first week/Secret Message Decoding/test_cases/test7.out
new file mode 100644
index 0000000..da104fd
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test7.out	
@@ -0,0 +1 @@
+god yzal eht revo spmuj xof nworb kciuq ehT
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test8.in b/first week/Secret Message Decoding/test_cases/test8.in
new file mode 100644
index 0000000..2689b08
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test8.in	
@@ -0,0 +1 @@
+huang421
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test8.out b/first week/Secret Message Decoding/test_cases/test8.out
new file mode 100644
index 0000000..ec74cbe
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test8.out	
@@ -0,0 +1 @@
+124gnauh
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test9.in b/first week/Secret Message Decoding/test_cases/test9.in
new file mode 100644
index 0000000..24ee35c
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test9.in	
@@ -0,0 +1 @@
+wo xi huan ni
\ No newline at end of file
diff --git a/first week/Secret Message Decoding/test_cases/test9.out b/first week/Secret Message Decoding/test_cases/test9.out
new file mode 100644
index 0000000..bb00a4e
--- /dev/null
+++ b/first week/Secret Message Decoding/test_cases/test9.out	
@@ -0,0 +1 @@
+in nauh ix ow
\ No newline at end of file
diff --git a/second week/Lake Counting S/Lake Counting S.md b/second week/Lake Counting S/Lake Counting S.md
new file mode 100644
index 0000000..437c75f
--- /dev/null
+++ b/second week/Lake Counting S/Lake Counting S.md	
@@ -0,0 +1,47 @@
+# Lake Counting S
+
+## 题目描述
+
+由于最近的降雨，水在农夫约翰的田地里积聚了。田地可以表示为一个 $N \times M$ 的矩形（$1 \leq N \leq 100$；$1 \leq M \leq 100$）。每个方格中要么是水（`W`），要么是干地（`.`）。农夫约翰想要弄清楚他的田地里形成了多少个水塘。一个水塘是由连通的水方格组成的，其中一个方格被认为与它的八个邻居相邻（上下左右，四个对角线方向也算相邻）。给定农夫约翰田地的示意图，确定他有多少个水塘。
+
+## 输入格式
+
+第 $1$ 行：两个用空格分隔的整数：$N$ 和 $M$。
+
+第 $2$ 行到第 $N+1$ 行：每行 $M$ 个字符，表示农夫约翰田地的一行。
+
+每个字符要么是 `W`，要么是 `.`。
+
+字符之间没有空格。
+
+## 输出格式
+
+第 $1$ 行：农夫约翰田地中的水塘数量。
+
+## 输入输出样例
+
+### 输入
+
+```
+10 12
+W........WW.
+.WWW.....WWW
+....WW...WW.
+.........WW.
+.........W..
+..W......W..
+.W.W.....WW.
+W.W.W.....W.
+.W.W......W.
+..W.......W.
+```
+
+### 输出
+
+```
+3
+```
+
+## 说明/提示
+
+输出详情：共有三个水塘：一个在左上角，一个在左下角，还有一个沿着右侧。
diff --git a/second week/Lake Counting S/test_cases/1.in b/second week/Lake Counting S/test_cases/1.in
new file mode 100644
index 0000000..e82474b
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/1.in	
@@ -0,0 +1,4 @@
+3 3
+www
+www
+www
diff --git a/second week/Lake Counting S/test_cases/1.out b/second week/Lake Counting S/test_cases/1.out
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/1.out	
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/10.in b/second week/Lake Counting S/test_cases/10.in
new file mode 100644
index 0000000..97baa8d
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/10.in	
@@ -0,0 +1,6 @@
+5 5
+.....
+.....
+w.w.w
+.....
+.....
diff --git a/second week/Lake Counting S/test_cases/10.out b/second week/Lake Counting S/test_cases/10.out
new file mode 100644
index 0000000..e440e5c
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/10.out	
@@ -0,0 +1 @@
+3
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/2.in b/second week/Lake Counting S/test_cases/2.in
new file mode 100644
index 0000000..ae7385d
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/2.in	
@@ -0,0 +1,5 @@
+4 4
+w..w
+.w.w
+..w.
+w..w
diff --git a/second week/Lake Counting S/test_cases/2.out b/second week/Lake Counting S/test_cases/2.out
new file mode 100644
index 0000000..d8263ee
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/2.out	
@@ -0,0 +1 @@
+2
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/3.in b/second week/Lake Counting S/test_cases/3.in
new file mode 100644
index 0000000..93e1d8f
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/3.in	
@@ -0,0 +1,3 @@
+2 2
+w.
+.w
diff --git a/second week/Lake Counting S/test_cases/3.out b/second week/Lake Counting S/test_cases/3.out
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/3.out	
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/4.in b/second week/Lake Counting S/test_cases/4.in
new file mode 100644
index 0000000..5d6af8e
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/4.in	
@@ -0,0 +1,6 @@
+5 5
+wwwww
+.w.w.
+.w.w.
+.w.w.
+wwwww
diff --git a/second week/Lake Counting S/test_cases/4.out b/second week/Lake Counting S/test_cases/4.out
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/4.out	
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/5.in b/second week/Lake Counting S/test_cases/5.in
new file mode 100644
index 0000000..5a26681
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/5.in	
@@ -0,0 +1,4 @@
+3 3
+w.w
+.w.
+w.w
diff --git a/second week/Lake Counting S/test_cases/5.out b/second week/Lake Counting S/test_cases/5.out
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/5.out	
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/6.in b/second week/Lake Counting S/test_cases/6.in
new file mode 100644
index 0000000..1b30481
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/6.in	
@@ -0,0 +1,5 @@
+4 5
+.....
+.w.w.
+.w.w.
+.....
diff --git a/second week/Lake Counting S/test_cases/6.out b/second week/Lake Counting S/test_cases/6.out
new file mode 100644
index 0000000..d8263ee
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/6.out	
@@ -0,0 +1 @@
+2
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/7.in b/second week/Lake Counting S/test_cases/7.in
new file mode 100644
index 0000000..b6ad5e2
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/7.in	
@@ -0,0 +1,7 @@
+6 6
+......
+.w....
+.w.w..
+....w.
+.....w
+...... 
diff --git a/second week/Lake Counting S/test_cases/7.out b/second week/Lake Counting S/test_cases/7.out
new file mode 100644
index 0000000..d8263ee
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/7.out	
@@ -0,0 +1 @@
+2
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/8.in b/second week/Lake Counting S/test_cases/8.in
new file mode 100644
index 0000000..9e095a2
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/8.in	
@@ -0,0 +1,3 @@
+2 3
+ww.
+w.w
diff --git a/second week/Lake Counting S/test_cases/8.out b/second week/Lake Counting S/test_cases/8.out
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/8.out	
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/second week/Lake Counting S/test_cases/9.in b/second week/Lake Counting S/test_cases/9.in
new file mode 100644
index 0000000..7216736
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/9.in	
@@ -0,0 +1,4 @@
+3 4
+w.w.
+.w..
+.w.w
diff --git a/second week/Lake Counting S/test_cases/9.out b/second week/Lake Counting S/test_cases/9.out
new file mode 100644
index 0000000..d8263ee
--- /dev/null
+++ b/second week/Lake Counting S/test_cases/9.out	
@@ -0,0 +1 @@
+2
\ No newline at end of file
diff --git a/second week/Last Minute/Last Minute.md b/second week/Last Minute/Last Minute.md
new file mode 100644
index 0000000..834bcb1
--- /dev/null
+++ b/second week/Last Minute/Last Minute.md	
@@ -0,0 +1,52 @@
+# 考前临时抱佛脚
+
+## 题目背景
+
+rr平时太忙没有时间学习。但是，临近期末考试，他必须要开始抱佛脚，以求不挂科。
+
+## 题目描述
+
+这次期末考试，rr需要考 $4$ 科。因此要开始刷习题集，每科都有一个习题集，分别有 $s_1,s_2,s_3,s_4$ 道题目，完成每道题目需要一些时间，可能不等（$A_1,A_2,\ldots,A_{s_1}$，$B_1,B_2,\ldots,B_{s_2}$，$C_1,C_2,\ldots,C_{s_3}$，$D_1,D_2,\ldots,D_{s_4}$）。
+
+
+rr有一个能力，他的左右两个大脑可以同时计算 $2$ 道不同的题目，但是仅限于同一科。因此，他必须一科一科的复习。rr希望知道能够完成复习的最短时间。
+
+## 输入格式
+
+本题包含 $5$ 行数据：第 $1$ 行，为四个正整数 $s_1,s_2,s_3,s_4$。
+
+第 $2$ 行，为 $A_1,A_2,\ldots,A_{s_1}$ 共 $s_1$ 个数，表示第一科习题集每道题目所消耗的时间。
+
+第 $3$ 行，为 $B_1,B_2,\ldots,B_{s_2}$ 共 $s_2$ 个数。
+
+第 $4$ 行，为 $C_1,C_2,\ldots,C_{s_3}$ 共 $s_3$ 个数。
+
+第 $5$ 行，为 $D_1,D_2,\ldots,D_{s_4}$ 共 $s_4$ 个数，意思均同上。
+
+## 输出格式
+
+输出一行，为复习完毕最短时间。
+
+## 输入输出样例
+
+### 输入
+
+```
+1 2 1 3		
+5
+4 3
+6
+2 4 3
+```
+
+### 输出
+
+```
+20
+```
+
+## 说明/提示
+
+$1\leq s_1,s_2,s_3,s_4\leq 20$
+
+$1\leq A_1,A_2,\ldots,A_{s_1},B_1,B_2,\ldots,B_{s_2},C_1,C_2,\ldots,C_{s_3},D_1,D_2,\ldots,D_{s_4}\leq60$
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/1.in b/second week/Last Minute/test_cases/1.in
new file mode 100644
index 0000000..cf8c15e
--- /dev/null
+++ b/second week/Last Minute/test_cases/1.in	
@@ -0,0 +1,5 @@
+1 1 1 1
+1
+1
+1
+1
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/1.out b/second week/Last Minute/test_cases/1.out
new file mode 100644
index 0000000..bf0d87a
--- /dev/null
+++ b/second week/Last Minute/test_cases/1.out	
@@ -0,0 +1 @@
+4
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/10.in b/second week/Last Minute/test_cases/10.in
new file mode 100644
index 0000000..16786f4
--- /dev/null
+++ b/second week/Last Minute/test_cases/10.in	
@@ -0,0 +1,5 @@
+1 2 1 2
+2
+3 4
+5
+6 7
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/10.out b/second week/Last Minute/test_cases/10.out
new file mode 100644
index 0000000..25bf17f
--- /dev/null
+++ b/second week/Last Minute/test_cases/10.out	
@@ -0,0 +1 @@
+18
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/2.in b/second week/Last Minute/test_cases/2.in
new file mode 100644
index 0000000..14f3ae0
--- /dev/null
+++ b/second week/Last Minute/test_cases/2.in	
@@ -0,0 +1,5 @@
+2 2 2 2
+2 2
+3 3
+4 4
+5 5
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/2.out b/second week/Last Minute/test_cases/2.out
new file mode 100644
index 0000000..da2d398
--- /dev/null
+++ b/second week/Last Minute/test_cases/2.out	
@@ -0,0 +1 @@
+14
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/3.in b/second week/Last Minute/test_cases/3.in
new file mode 100644
index 0000000..b33fa4a
--- /dev/null
+++ b/second week/Last Minute/test_cases/3.in	
@@ -0,0 +1,5 @@
+3 3 3 3
+1 2 10
+2 5 8
+3 6 9
+4 7 12
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/3.out b/second week/Last Minute/test_cases/3.out
new file mode 100644
index 0000000..72f523f
--- /dev/null
+++ b/second week/Last Minute/test_cases/3.out	
@@ -0,0 +1 @@
+39
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/4.in b/second week/Last Minute/test_cases/4.in
new file mode 100644
index 0000000..2e7871a
--- /dev/null
+++ b/second week/Last Minute/test_cases/4.in	
@@ -0,0 +1,5 @@
+5 1 1 1
+1 2 3 4 5
+5
+10
+7
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/4.out b/second week/Last Minute/test_cases/4.out
new file mode 100644
index 0000000..8580e7b
--- /dev/null
+++ b/second week/Last Minute/test_cases/4.out	
@@ -0,0 +1 @@
+30
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/5.in b/second week/Last Minute/test_cases/5.in
new file mode 100644
index 0000000..2fda8cd
--- /dev/null
+++ b/second week/Last Minute/test_cases/5.in	
@@ -0,0 +1,5 @@
+3 3 3 3
+5 5 5
+5 5 5
+5 5 5
+5 5 5
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/5.out b/second week/Last Minute/test_cases/5.out
new file mode 100644
index 0000000..86ee83a
--- /dev/null
+++ b/second week/Last Minute/test_cases/5.out	
@@ -0,0 +1 @@
+40
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/6.in b/second week/Last Minute/test_cases/6.in
new file mode 100644
index 0000000..c73eebd
--- /dev/null
+++ b/second week/Last Minute/test_cases/6.in	
@@ -0,0 +1,5 @@
+4 4 4 4
+60 60 60 60
+60 60 60 60
+60 60 60 60
+60 60 60 60
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/6.out b/second week/Last Minute/test_cases/6.out
new file mode 100644
index 0000000..7ad8022
--- /dev/null
+++ b/second week/Last Minute/test_cases/6.out	
@@ -0,0 +1 @@
+480
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/7.in b/second week/Last Minute/test_cases/7.in
new file mode 100644
index 0000000..124ddc4
--- /dev/null
+++ b/second week/Last Minute/test_cases/7.in	
@@ -0,0 +1,5 @@
+3 3 3 3
+1 1 20
+2 2 25
+3 3 30
+4 4 35
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/7.out b/second week/Last Minute/test_cases/7.out
new file mode 100644
index 0000000..97e3504
--- /dev/null
+++ b/second week/Last Minute/test_cases/7.out	
@@ -0,0 +1 @@
+110
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/8.in b/second week/Last Minute/test_cases/8.in
new file mode 100644
index 0000000..9e9df6c
--- /dev/null
+++ b/second week/Last Minute/test_cases/8.in	
@@ -0,0 +1,5 @@
+1 5 5 5
+10
+1 2 3 4 5
+5 4 3 2 1
+6 6 6 6 6
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/8.out b/second week/Last Minute/test_cases/8.out
new file mode 100644
index 0000000..d2e1cef
--- /dev/null
+++ b/second week/Last Minute/test_cases/8.out	
@@ -0,0 +1 @@
+44
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/9.in b/second week/Last Minute/test_cases/9.in
new file mode 100644
index 0000000..e625d63
--- /dev/null
+++ b/second week/Last Minute/test_cases/9.in	
@@ -0,0 +1,5 @@
+4 3 5 2
+3 8 2 7
+5 6 1
+2 4 6 3 1
+9 2
\ No newline at end of file
diff --git a/second week/Last Minute/test_cases/9.out b/second week/Last Minute/test_cases/9.out
new file mode 100644
index 0000000..dc7b54a
--- /dev/null
+++ b/second week/Last Minute/test_cases/9.out	
@@ -0,0 +1 @@
+33
\ No newline at end of file