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- #include <iostream>
- using namespace std;
- int n,z,s,i,j,a[201][201];
- int main()
- {
- cin>>n>>z;
- 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;j++)
- if(z==1 && (i<j && i+j<n+1))
- s=s+a[i][j];
- else if(z==2 && (i<j && i+j>n+1))
- s=s+a[i][j];
- else
- if(z==3 && (i>j && i+j>n+1))
- s=s+a[i][j];
- else if(z==4 && (i>j && i+j<n+1))
- s=s+a[i][j];
- }
- cout<<s<<endl;
- return 0;
- }
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