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  1. #include <stdio.h>
  2.  
  3. int cmp(int x, int y)    // compare x and y
  4. {
  5.     return x > y;   // 1 if x > y, 0 otherwise
  6. }
  7.  
  8. void swap(int *x, int *y)
  9. {
  10.     int tmp = *x;
  11.  
  12.     *x = *y;
  13.     *y = tmp;
  14. }
  15.  
  16. int main(void)
  17. {
  18.     int a[] = {3, 1, 4, 1, 5, 9, 2, 6, 5};   // array to be sorted
  19.     size_t n = sizeof a / sizeof a[0];       // number of elements
  20.  
  21.     for (size_t i = 0; i < n - 1; ++i) {
  22.         int count = 0;                       // 周の最初に0へ戻す
  23.         for (size_t j = 0; j < n - 1 - i; ++j) {
  24.             if (cmp(a[j], a[j+1])) {
  25.                 swap( &a[j] , &a[j+1] );
  26.                 count++;                     // 入れ替えたら+1
  27.             }
  28.         }
  29.         if (count == 0) {                    // 入れ替え0回なら整列完了
  30.             break;
  31.         }
  32.     }
  33.  
  34.     for (size_t i = 0; i < n; ++i) {
  35.         printf("%d ", a[i]);
  36.     }
  37.     printf("\n");
  38.  
  39.     return 0;
  40. }
  41.  
  42. /*
  43. ①21行目の下にint count =0;
  44. ②if (cmp( ? , ? )) {swap( ? , ? );}の{}中にcount++;
  45. ③26行目の下にif (count == 0){break;}
  46. なお、今回においてはcountで数える必要がないため、++count;の行はcount =1;；に置き換え、ON/OFF判定にすることも可能である。
  47. */
Success #stdin #stdout 0s 5348KB
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https://ideone.com/1QxL4i
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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