逃出秘境

userId_undefined

复仇者_零

尊贵铂金

2023-08-07 10:41:48

发布于：浙江

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#include<bits/stdc++.h>
using namespace std;
int a[10],v[10],flag;
int cnt,ans;
void f(int x,int num){
	if(x > 8){
		ans++;
		if(num == cnt){
			cout<<ans;
			flag = 1;
		}
		return;
	}
	for(int i = 0;i <= 9;i++){
		if(!v[i]){
			v[i] = 1;
			f(x + 1,num * 10 + i);
			v[i] = 0;
		}
	}
}
int main(){
	freopen("run.in","r",stdin);
	freopen("run.out","w",stdout);
	cin>>cnt;
	f(1,0);
	fclose(stdin);
	fclose(stdout);
	return 0;
}
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