Find The Multiple

Posted 2021-01-22 stul

Given a positive integer n, write a program to find out a nonzero multiple m of n whose decimal representation contains only the digits 0 and 1. You may assume that n is not greater than 200 and there is a corresponding m containing no more than 100 decimal digits.

Input

The input file may contain multiple test cases. Each line contains a value of n (1 <= n <= 200). A line containing a zero terminates the input.

Output

For each value of n in the input print a line containing the corresponding value of m. The decimal representation of m must not contain more than 100 digits. If there are multiple solutions for a given value of n, any one of them is acceptable.

Sample Input

2
6
19
0

Sample Output

10
100100100100100100
111111111111111111

题意：给你一个数n，找出一个他的倍数m。（我被样例唬住了）
题解：用bfs，从1开始，两个方向（因为只有0和1组成） x*10   x*10+1，进队即可，然后判断是否是n的倍数，是就输出。

#include<iostream>
#include<queue>
typedef  long long ll;
using namespace std;
int n;

void bfs(int n){
	queue<ll>q;
	q.push(1);
	ll head;
	while(!q.empty()){
		head = q.front();
		q.pop();
		if(!(head%n)) {
			cout<<head<<endl;break;
		}
		q.push(head*10);
		q.push(head*10+1);
	}
}

int main(){
	while(cin>>n && n){
		bfs(n);
	}
	return 0;
}