843. n-皇后问题 - AcWing题库

 

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
using namespace std;

const int N=10;

int n;
char q[N][N];
bool col[N],dg[2*N],udg[2*N];

void dfs(int u){
    if(u==n){
        rep(i,0,n) puts(q[i]);
        puts("");
        return; 
    }
    rep(i,0,n){
        if(!col[i]&&!dg[u+i]&&!udg[n-u+i]){
            q[u][i]='Q';
            col[i]=dg[u+i]=udg[n-u+i]=true;
            dfs(u+1);
            col[i]=dg[u+i]=udg[n-u+i]=false;
            q[u][i]='.';
        }
    }
}

int main(){
    cin>>n;
    rep(i,0,n)
        rep(j,0,n)
            q[i][j]='.';
    dfs(0);
    return 0;
}