#include<stdio.h> #define N 15 int main() { int n; int i, j; int a[N][N]; int sum = 0; scanf("%d", &n); if(n > 1&&n < 10) { for(i = 0; i < n; i++) { for(j = 0; j < n; j++) { scanf("%d", &a[i][j]); if(i >= j) { sum += a[i][j]; } } } printf("%d\n", sum); } return 0; } |
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