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- #include <iostream>
- using namespace std;
- int main() {
- int n, a[100][100],i,j,s=0;
- cin>>n;
- for(i=1;i<=n;i++)
- for(j=1;j<=n;j++)
- cin>>a[i][j];
- for(i=1;i<=n;i++)
- for(j=1;j<=n-1;j++)
- if(i<j && i+j>n+1 )
- s=s+a[i][j];
- cout<<s;
- return 0;
- }
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