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