View Code of Problem 51

#include <stdio.h>
 
int main(){
  int i,j,n;
  int a[10][10];
  while(scanf("%d",&n)!=EOF){
    for(i=0;i<n;i++){
      for(j=0;j<n;j++){
        scanf("%d",&a[i][j]);
      }
    }
    int sum=0;
    for(i=0;i<n;i++){
      for(j=n-1;j>=i;j--){
        sum+=a[i][j];
      }
    }
    printf("%d\n",sum);
  }
  return 0;
}