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  1. #include <stdio.h>
  2.  
  3.     void print_repeats(unsigned a[], unsigned n)
  4.     {
  5.         unsigned i, _2n = 2*n;
  6.         for(i = 0; i < n; ++i) if(a[a[i] % n] < _2n) a[a[i] % n] += n;
  7.         for(i = 0; i < n; ++i) if(a[i] >= _2n) printf("%u ", i);
  8.         putchar('\n');
  9.     }
  10.  
  11.     int main()
  12.     {
  13.         unsigned a[] = {1, 2, 3, 1, 3, 0, 3, 6};
  14.         print_repeats(a, sizeof(a)/sizeof(unsigned));
  15.         return 0;
  16.     }
  17.  
Success #stdin #stdout 0.01s 1720KB
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https://ideone.com/gG7bF
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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