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Nqueen.cpp
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Nqueen.cpp
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#include<bits/stdc++.h>
using namespace std;
int col[10];
int bd[10];
int fd[10];
int mat[4][4];
int issafe(int i,int j)
{
if(col[j]==0)
{
if(bd[4+i-j]==0)
{
if(fd[i+j]==0)
{return 1;}
else
return 0;
}
else
return 0;
}
else
return 0;
}
int nqueen(int rowi)
{
if(rowi==4)
return 1;
int i,j,k;
for(int co=0;co<4;co++)
{
if(issafe(rowi,co))
{
mat[rowi][co]=1;
col[co]=1;
fd[rowi+co]=1;
bd[rowi-co+4]=1;
if(nqueen(rowi+1))
return 1;
mat[rowi][co]=0;
col[co]=0;
fd[rowi+co]=0;
bd[rowi-co+4]=0;
}
}
return 0;
}
int main()
{
int n=4;
int i,j;
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
mat[i][j]=0;
}
if(!nqueen(0))return 0;
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
cout<<mat[i][j]<<" ";
cout<<endl;
}
}