#include<bits/stdc++.h> using namespace std; int main() { int n,sum=0; cin>>n; int a[n][n]; for(int i=0;i<n;i++) { for(int j=0;j<n;j++) { cin>>a[i][j]; if(i>=j) sum=sum+a[i][j]; } } cout<<sum; return 0; } |
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