题解 | #牛牛的素数和#

#include <stdio.h>
#include <math.h>
int main()
{
	int n, m;
	scanf("%d%d", &n, &m);
	int sum = 0;
	for (int i = n; i < m + 1; i++)
	{
		int flag = 1;
		for (int j = 2; j <= (int)sqrt(i); j++)
		{
			if (i % j == 0)
			{
				flag = 0;
                break;
			}
		}
		if (flag)
			sum += i;
	}
	printf("%d", sum);
	return 0;
}