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  1. #include <stdio.h>
  2.  
  3. int min(int a, int b){
  4.     return (a < b) ? a : b; /* if 的簡寫版本 */
  5. }
  6. int max(int a, int b){
  7.     return (a < b) ? b : a;
  8. }
  9.  
  10. int main(void){
  11.     int in1, in2, cycle;
  12.     int i, j, c;
  13.  
  14.     while(scanf("%d %d", &in1, &in2)!=EOF){ /* EOF = end of file */
  15.         cycle = 0;
  16.         for(i=min(in1, in2); i<=max(in1, in2); i++){
  17.             j = i;
  18.             c = 1; /* 數字本身算一次 */
  19.             while(j > 1){
  20.                 if(j & 1) j = j*3 + 1; /* 邏輯運算子判斷是否為奇數 */
  21.                 else j /= 2;
  22.                 c++;
  23.             }
  24.             cycle = c > cycle ? c : cycle;
  25.         }
  26.         printf("%d %d %d\n", in1, in2, cycle);
  27.     }
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0s 9432KB
comments (?)
stdin
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stdout
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1 10 20
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201 210 89
900 1000 174
https://ideone.com/rAbaT9
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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