代码：

#include<iostream>
#define int long long
using namespace std;

int c[15];
int n,cnt;

int abs(int a){
	return a < 0 ? -a : a;
}

void dfs(int cur){
	if(cur > n){
		cnt ++;
		if(cnt <= 3){
			for(int i = 1;i < cur;i ++){
				cout<<c[i]<<" ";
			}
			cout<<endl;
		}
		return ;
	}
	for(int i = 1;i <= n;i ++){
		bool mark = false;
		for(int j = 1;j < cur;j ++){
			if(abs(j-cur) == abs(c[j]-i)){
				mark = true;
				break;
			}
			if(c[j] == i){
				mark = true;
				break;
			}
		}
		if(mark){
			continue;
		}else{
			c[cur] = i;
			dfs(cur + 1);
		}
	}
}

signed main(){
	cin>>n;
	dfs(1);
	cout<<cnt<<endl;
	return 0;
}

但是把

#define int long long

删掉，把

signed main()

改成

int main()

之后又过了