#include<stdio.h> int main() { int sum = 0; //计算大于零的元素之和 int arr[10][10] = {0}; int n = 0; int m = 0; scanf("%d %d",&n,&m); int i = 0; int j = 0; 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\n",sum); return 0; }