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- #include <iostream>
- using namespace std;
- int main()
- {
- int a[51][51],m,n,p=1,i,j;
- cin>>m>>n;
- for(i=1; i<=m; i++)
- for(j=1; j<=n; j++)
- cin>>a[i][j];
- for(i=1; i<=m; i++)
- for(j=1; j<=n; j++)
- if(a[i][j]>=0 && i%2==0 && j%2==1)
- p=p*a[i][j];
- cout<<p;
- }
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