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