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Cod sursa(job #22074)
#include<fstream.h>
main() {
int n,**a;
int i,j,k;
ifstream f("dame.in");
ofstream g("dame.out");
f>>n;
a=new int*[n];
for(i=1;i<=n;i++) a[i]=new int[n];
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
a[i][j]=0;
if(n%2) j=(n/2)+1;
else j=n/2;
k=n;
for(i=1;i<=n;i++)
if(i%2) { a[i][j]=1;j--;}
else {a[i][k]=1;k--;}
g<<n<<'\n';
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
if(a[i][j]) g<<i<<" "<<j<<'\n';
return 0;
}