View Code of Problem 51

#include<stdio.h>
#include<string.h>
#include<math.h>
int main(){
	int n;
	scanf("%d",&n);
	
	int res[n][n];
	int i,j;
	for(i = 0;i < n; i++)
		for(j = 0;j < n; j++){
			scanf("%d",&res[i][j]);
		} 
	int sum = 0;
	for(i = 0;i < n; i++)
		for(j = 0;j <= i; j++){
			sum += res[i][j];
		}
	printf("%d",sum);
	return 0;
}