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  1. unsigned reverse(unsigned int h)
  2. {
  3. 	bitset<32> hash;
  4. 	// 1. hash = hash + (hash << 16);
  5. 	for(int i = 0; i < 32; i += 16)
  6. 		h = h - ((h & (((1LL << 16) - 1) << i)) << 16);
  7. 	// 2. hash = hash ^ (hash >> 11);
  8. 	hash = h;
  9. 	for(int i = 20; i >= 0; i--)
  10. 		hash[i] = hash[i] ^ hash[i + 11];
  11. 	h = hash.to_ulong();
  12. 	// 3. hash = hash + (hash << 3);
  13. 	for(int i = 0; i < 32; i += 3)
  14. 		h = h - ((h & (((1LL << 3) - 1) << i)) << 3);
  15. 	// 4. hash = hash ^ (hash >> 6);
  16. 	hash = h;
  17. 	for(int i = 25; i >= 0; i--)
  18. 		hash[i] = hash[i] ^ hash[i + 6];
  19. 	h = hash.to_ulong();
  20. 	// 5. hash = hash + (hash << 10);
  21. 	for(int i = 0; i < 32; i += 10)
  22. 		h = h - ((h & (((1LL << 10) - 1) << i)) << 10);
  23. 	return h;
  24. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'unsigned int reverse(unsigned int)':
prog.cpp:3:2: error: 'bitset' was not declared in this scope
  bitset<32> hash;
  ^
prog.cpp:3:13: error: 'hash' was not declared in this scope
  bitset<32> hash;
             ^
stdout
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Standard output is empty
https://ideone.com/rx8VI4
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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