#include <stdio.h> using namespace std; int main(){ int n; scanf("%d", &n ); int arr[n][n]; for( int i=0; i<n; i++ ){ for( int j=0; j<n; j++ ){ scanf("%d", &arr[i][j]); } } int sum = 0; for( int i=0;i<n; i++ ){ for( int j=0;j<=i; j++ ){ sum += arr[i][j]; } } printf("%d\n", sum); return 0; } |
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