View Code of Problem 51

#include<stdio.h>
#include "string.h"
int main()
{
    int a[100][100];
    int n;
    scanf("%d",&n);
    for(int i=1;i<n+1;i++){
        for(int j=1;j<n+1;j++){
            scanf("%d",&a[i][j]);
        }
    }

    int sum=0;
    for(int i=1;i<n+1;i++){
        for(int j=0;j<i;j++){
            sum=sum+a[i][j+1];
        }
    }
    printf("%d",sum);
    return 0;
}

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