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poj1426

Find The Multiple
Time Limit: 1000MS Memory Limit: 10000K
Total Submissions: 27177 Accepted: 11309 Special Judge

Description

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

26190

Sample Output

10100100100100100100111111111111111111

Source

Dhaka 2002
题解:
题目的意思就是给你一个数n,让你找到一个它的倍数只由1和0组成。(任何一个都可以,Special Judge)
AC代码:(c++)
#include<cstdio>using namespace std;int n,flag;void go(long long p,int k){    if(flag||k==20) return ;    if(p%n==0){        printf("%I64u\n",p);        flag=1;    }    else{        go(p*10,k+1);        go(p*10+1,k+1);    }}int main(){    for(scanf("%d",&n);n;scanf("%d",&n)) flag=0,go(1,1);    return 0;}

 

poj1426