View Code of Problem 51

#include<stdio.h>
#include<math.h>
#include<string.h>

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

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