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- #include<iostream>
- using namespace std;
- int main()
- {
- int a[1000][1000];
- int n,answer=1;
- cin>>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=i+1;j<n;++j)
- if((i+j)%2==0)answer*=a[i][j];
- cout<<answer<<endl;
- return 0;
- }
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