【codevs1295】N皇后问题

problem

solution

codes

//c[i]:第i行的皇后放在第几列
#include<iostream>
using namespace std;
int n, c[20], ans;
void dfs(int cur){
    if(cur > n)ans++;
    else for(int i = 1; i <= n; i++){
        int ok = 1;
        for(int j = 1; j < cur; j++)
            if(c[j]==i || c[j]-j==i-cur || c[j]+j==i+cur)
                { ok = 0; break; }
        if(ok){
            c[cur] = i;
            dfs(cur+1);
        }
    }
}
int main(){
    cin>>n;
    dfs(1);
    cout<<ans<<"
";
    return 0;
}