# include<stdio.h> int main(void) { int n,i,j,sum = 0,a[100][100]; 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 = sum + a[i][j]; } } printf("%d",sum); return 0; } |
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