View Code of Problem 51

#include<stdio.h>
main(){
  int n;
  int a[10][10];
  int i,j,count=0;
  scanf("%d",&n);
  for(i=0;i<n;i++){
    for(j=0;j<n;j++){
      scanf("%d",&a[i][j]);}}
  for(i=0;i<n;i++){
    for(j=0;j<=i;j++){
      count=count+a[i][j];}}
  printf("%d",count);
}