https://vjudge.net/problem/POJ-1426
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
1 #include <iostream> 2 #include <cstdio> 3 #include <queue> 4 #define ll long long 5 using namespace std; 6 void bfs(int n) 7 { 8 queue<ll>q; 9 q.push(1); 10 while(!q.empty()) 11 { 12 int i; 13 ll x; 14 x=q.front(); 15 q.pop(); 16 if(!(x%n)) 17 { 18 printf("%lld\n",x); 19 return ; 20 } 21 q.push(x*10); 22 q.push(x*10+1); 23 } 24 } 25 int main() 26 { 27 int n; 28 while(scanf("%d",&n)) 29 { 30 if(!n) break; 31 else bfs(n); 32 } 33 return 0; 34 }