#include<iostream> 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]; for(int i=0;i<n;i++) for(int j=0;j<i+1;j++) sum=sum+a[i][j]; cout<<sum<<endl; } |
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