uva10318(暴力)

题意:

给出一个n;

求出有几组s1,s2 使s1/s2=n;

升序排列;

思路:

暴力枚举除数;

#include<cstdio>
#include<cstring>
#include<queue>
#include<vector>
#include<algorithm>
#define ll long long
using namespace std;

ll n;
ll s1,s2;

priority_queue<ll, vector<ll>, greater<ll> > q;
bool judge(ll num) {
	int vis[10];
	memset(vis, 0 ,sizeof(vis));
	int l;
	while(num != 0) {
		l = num % 10;
		if(vis[l])
			return false;
		vis[l] = 1;
		num /= 10;
	}
	return true;
}
void dfs(ll cur, bool f , ll s) {
	if(f) {
		ll tmp = cur * n;
		if(tmp > 9876543210)
			return;
		if(judge(tmp)) {
			q.push(cur);
		}
	}
	for(int i = 0; i < 10; i++) {
		if(i == 0 && !f)
			continue;
		if(!(s & (1 << i))) {
			dfs(cur * 10 + i,1,s | (1 << i));
		}
	}
}
int main() {
	int t;
	scanf("%d",&t);
	while(t--) {
		scanf("%lld",&n);
		dfs(0,0,0);
		while(!q.empty()) {
			if(judge(q.top() * n)) {
				printf("%lld / %lld = %lld\n",q.top() * n,q.top(),n);
			}
			q.pop();
		}
		if(t)
			printf("\n");
	}
	return 0;
}