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- #include <iostream>
- using namespace std;
- int a[501][501],n;
- int sum_lin(int l)
- {
- int s=0,j;
- for(j=1;j<=n;j++)
- s=s+a[l][j];
- return s;
- }
- int sum_col(int c)
- {
- int s=0,j;
- for(j=1;j<=n;j++)
- s=s+a[j][c];
- return s;
- }
- int main()
- {int ok=1;
- cin>>n;
- int x=(n*n*n+n)/2;
- for(int i=1;i<=n;i++)
- for(int j=1;j<=n;j++)
- cin>>a[i][j];
- for(int i=1;i<=n;i++)
- if(sum_lin(i)!=x)
- ok= 0;
- for(int i=1;i<=n;i++)
- if(sum_col(i)!=x)
- ok= 0;
- if(ok)
- cout<<"true";
- else
- cout<<"false";
- return 0;
- }
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