View Code of Problem 51

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include<math.h>
void main() {
    int num[10][10],n,sum=0;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            scanf("%d", &num[i][j]);
        }
    }
    for (int i = n - 1; i >= 0; i--) {
        for (int j = i; j >= 0; j--) {
            sum += num[i][j];
        }
    }
    printf("%d\n", sum);
}