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POJ 1426 <Find The Multiple> <搜索>
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
26190Sample Output
10100100100100100100111111111111111111
题解:首先,题目没有提示,也就是最后答案肯定不需要大数模板,也就是long long存的下,那就是18位的10进制数够了。直接暴力跑一遍就行。
#include<cstdlib>#include<cstdio>#include<cstring>#include<algorithm>using namespace std;bool found; void DFS(unsigned long long t, int n, int k) { if (found) return; if (t%n == 0) { printf("%I64u\n", t); found = true; return; } if (k == 19) return; DFS(t * 10, n, k + 1); DFS(t * 10 + 1, n, k + 1); } int main() { int n; while (scanf("%d",&n)&&n) { found = false; DFS(1, n, 0); } return 0; }
POJ 1426 <Find The Multiple> <搜索>
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