Algorithms/Radix-Sort.cpp at master · Dev-XYS/Algorithms · GitHub

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#include <cstdio>

#define ELEMENT_COUNT 100000

using namespace std;

int n, d[ELEMENT_COUNT];
int pow10[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000 };

void radix_sort()
{
	static int c[10], _d[ELEMENT_COUNT];
	for (int k = 0; k < 8; k++)
	{
		for (int i = 0; i < 10; i++)
		{
			c[i] = 0;
		}
		for (int i = 0; i < n; i++)
		{
			c[d[i] / pow10[k] % 10]++;
		}
		for (int i = 1; i < 10; i++)
		{
			c[i] += c[i - 1];
		}
		for (int i = n - 1; i >= 0; i--)
		{
			_d[--c[d[i] / pow10[k] % 10]] = d[i];
		}
		for (int i = 0; i < n; i++)
		{
			d[i] = _d[i];
		}
	}
}

int main()
{
	scanf("%d", &n);
	for (int i = 0; i < n; i++)
	{
		scanf("%d", &d[i]);
	}
	radix_sort();
	for (int i = 0; i < n; i++)
	{
		printf("%d ", d[i]);
	}
	return 0;
}