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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. unsigned long long f(unsigned long long x){
  5.     if (x%2==0)
  6.        return x/2;
  7.     else
  8.         return 3*x+1;
  9. }
  10.  
  11. int main(){
  12.     unsigned int i, j, sum, *ii, cnt, k, l, m;
  13.     unsigned long long temp, *jj;
  14.     while (scanf("%lu%lu",&i,&j)!=EOF)
  15.     {
  16.           m=1;
  17.           cnt=i;
  18.           sum=0;
  19.           ii=(unsigned int*)calloc(j-i+1, sizeof(unsigned int));
  20.           for (temp=(unsigned long long)cnt;cnt<=j;cnt++)
  21.           {
  22.               temp=(unsigned long long)cnt;
  23.               if (ii[cnt-i]!=0)
  24.                  continue;
  25.               for (k=1,temp=(unsigned long long)cnt,jj=(unsigned long long *)calloc(1000,sizeof(unsigned long long));1;k++)
  26.               {
  27.                   free(jj);
  28.                   jj=(unsigned long long *)calloc(1000,sizeof(unsigned long long));
  29.                   if (cnt==1)
  30.                   {
  31.                      ii[0]=1;
  32.                      break;
  33.                   }
  34.                   jj[k-1]=temp;
  35.                   temp=f(temp);
  36.                   if (temp > (unsigned long long)j || temp<(unsigned long long) i)
  37.                      continue;
  38.                   if (ii[temp-i]!=0 || temp == 1)
  39.                   {
  40.                      for (l=k;l>=1;l--)
  41.                      {
  42.                          if (jj[l-1]>(unsigned long long)j || jj[l-1]<(unsigned long long)i)
  43.                          continue;
  44.                          else
  45.                          ii[jj[l-1]-1]=ii[temp-i]+k-l+1;
  46.                      }
  47.                      if (m<ii[jj[k-1]-1])
  48.                      {
  49.                         m=ii[jj[k-1]-1];
  50.                         printf("%lu\n",k);
  51.                         printf("%lu,%lu,%lu\n",jj[k-1],k,k);
  52.  
  53.                      }
  54.                      break;
  55.                   }
  56.               }
  57.           }
  58.           free(ii);
  59.     }
  60.     return 0;
  61. }
Success #stdin #stdout 0s 2292KB
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https://ideone.com/kKFOvS
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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