#include<stdio.h> #define N 9 int main(){ int a[N][N]; int i,j; int n; scanf("%d",&n); int sum=0; for(i=0;i<n;i++){ for(j=0;j<n;j++){ scanf("%d",&a[i][j]); } } for(i=0;i<n;i++){ for(j=0;j<=i;j++){ sum+=a[i][j]; } } // printf("\n"); printf("%d\n",sum); return 0; } |
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