View Code of Problem 51

#include<stdio.h>
#include<math.h>
#include<string.h>
void main(){
	int n,a[50][50],sum=0;
	scanf("%d",&n);
	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++)
			scanf("%d",&a[i][j]);
	for(int m=0;m<n;m++)
		for(int k=0;k<m+1;k++)
			sum+=a[m][k];
	printf("%d",sum);
}

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