View Code of Problem 51

#include<stdio.h>
int main()
{
	int s1[11][11], i, j, n, m, sum = 0;
	scanf("%d", &n);
	for (i = 0;i < n;i++)
		for (j = 0;j < n;j++)
			scanf("%d", &s1[i][j]);
	for (i = 0;i < n;i++)
		for (j = 0;j < n;j++)
		{
			if (i >= j)
				sum = sum + s1[i][j];
		}
	printf("%d\n", sum);
	return 0;
}

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