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  1. #include <stdio.h>
  2.  
  3. void dupes(int a[], int n)
  4. {
  5.     int swaps = 0;
  6.     int i;
  7.  
  8.     for (i = 0; i < n; i++)
  9.         while (a[a[i]] != a[i]) {
  10.             int tmp = a[i];
  11.             a[i] = a[tmp];
  12.             a[tmp] = tmp;
  13.             swaps++;
  14.         }
  15.  
  16.     for (i = 0; i < n; i++)
  17.         if (a[i] != i)
  18.             printf("%d ", a[i]);
  19.  
  20.     printf("\n(swaps = %d)\n", swaps);
  21. }
  22.  
  23. int main()
  24. {
  25.     int x[] = {1, 2, 3, 1, 3, 0, 6};
  26.  
  27.     dupes(x, sizeof x / sizeof x[0]);
  28.  
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0s 2112KB
comments (?)
stdin 
Standard input is empty
stdout 
3 1 
(swaps = 4)
https://ideone.com/xqc6ls
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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