#include<bits/stdc++.h> using namespace std; int 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 i = 0;i < n;i++){ for(int j = 0;j <= i;j++){ sum += a[i][j]; } } printf("%d", sum); return 0; } |
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