View Code of Problem 51

#include<iostream> 
#include<cstdio>

using namespace std;

int main(){
	int a[10][10];
	int n;
	scanf("%d",&n);
	for(int i=0;i<n;++i){
		for(int j=0;j<n;++j){
			scanf("%d",&a[i][j]);
			
		}
	}
	int sum=0;
	for(int i=0;i<n;++i){
		for(int j=0;j<=i;++j){
			sum+=a[i][j];
		}
	}
	printf("%d",sum);
	
}

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