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  1. #include <stdint.h>
  2. #include <stdlib.h>
  3.  
  4. static uint64_t seed;
  5.  
  6. void srand(unsigned s)
  7. {
  8.     seed = s - 1;
  9. }
  10.  
  11. int rand(void)
  12. {
  13.     seed = 6364136223846793005ULL * seed + 1;
  14.     return seed >> 33;
  15. }
  16.