View Code of Problem 51

#include <stdio.h>
#include <math.h>
#include <string.h>

int main(int argc, const char * argv[]) {
    int num[10][10];
    int n;
    int sum = 0;
    
    scanf("%d", &n);
    
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            scanf("%d", &num[i][j]);
        }
    }
    
    for(int i = 0; i < n; i++) {
        for(int j = 0; j <= i; j++) {
            sum += num[i][j];
        }
    }
    
    printf("%d\n", sum);
}

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