Longest cycle section

Source: Internet
Author: User


Because the result is either a finite number or an infinite loop of decimals, just simulate the process and then judge the loop to jump out and record the number of loops.

1#include <iostream>2#include <string.h>3#include <stdio.h>4#include <map>5 using namespacestd;6 intvis[1001],a[1001];7 intMain ()8 {9     //freopen ("A.txt", "R", stdin);Ten     intx,y,z,k; One      for(intI=1; i<= +; i++) A     { -memset (Vis,0,sizeof(Vis)); -x=1, z=0, k=1; the          while(1) -         { -y=x%i; -x=x/i; +             if(y==0|| Vis[y]) Break; -vis[y]=1; +x= (k-x*i) *Ten; Ak=x; atz++; -             //printf ("%d\n", x); -         } -         if(Vis[y]) a[i]=Z; -         Elsea[i]=0; -        //printf ("%d\n", A[i]); in     } -     intn,j=1, ans=0; toscanf"%d",&n); +      for(intI=1; i<=n;i++) -     { the         if(a[i]>ans) *         { $ans=A[i];Panax Notoginsengj=i; -         } the     } +printf"%d\n", j); A     return 0; the}

Longest cycle section

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