题解 | #矩阵计算#

#include <stdio.h>
int main() {
	int n, m, sum = 0;
	int i = 0, j = 0;
	int arr[20][20] = { 0 };
	scanf("%d %d", &n, &m);
	for (i = 0; i < n; i++) 
	{
		for (j = 0; j < m; j++)
		{
			scanf("%d", &arr[i][j]);
			if (arr[i][j] > 0)
				sum += arr[i][j];
		}
	}
	printf("%d", sum);
	return 0;
}