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#include "bit/ctz.hpp"
#ifndef CTZ_HPP #define CTZ_HPP #include <cstdint> inline int ctz32_(uint32_t bit) { static const int table[] = { 0, 1, 2, 6, 3, 11, 7, 16, 4, 14, 12, 21, 8, 23, 17, 26, 31, 5, 10, 15, 13, 20, 22, 25, 30, 9, 19, 24, 29, 18, 28, 27, }; static const uint32_t de_bruijn = 0x04653adf; bit &= ~bit + 1; return table[(bit * de_bruijn) >> 27]; }; inline int ctz32(uint32_t bit) { if (bit == 0) return 32; #ifdef __has_builtin return __builtin_ctz(bit); #else return ctz32_(bit); #endif }; inline int ctz64_(uint64_t bit) { static const int table[] = { 0, 1, 2, 7, 3, 13, 8, 19, 4, 25, 14, 28, 9, 34, 20, 40, 5, 17, 26, 38, 15, 46, 29, 48, 10, 31, 35, 54, 21, 50, 41, 57, 63, 6, 12, 18, 24, 27, 33, 39, 16, 37, 45, 47, 30, 53, 49, 56, 62, 11, 23, 32, 36, 44, 52, 55, 61, 22, 43, 51, 60, 42, 59, 58, }; static const uint64_t de_bruijn = 0x0218a392cd3d5dbfull; bit &= ~bit + 1; return table[(bit * de_bruijn) >> 58]; }; inline int ctz64(uint64_t bit) { if (bit == 0) return 64; #ifdef __has_builtin return __builtin_ctzll(bit); #else return ctz64_(bit); #endif }; #endif
#line 1 "bit/ctz.hpp" #include <cstdint> inline int ctz32_(uint32_t bit) { static const int table[] = { 0, 1, 2, 6, 3, 11, 7, 16, 4, 14, 12, 21, 8, 23, 17, 26, 31, 5, 10, 15, 13, 20, 22, 25, 30, 9, 19, 24, 29, 18, 28, 27, }; static const uint32_t de_bruijn = 0x04653adf; bit &= ~bit + 1; return table[(bit * de_bruijn) >> 27]; }; inline int ctz32(uint32_t bit) { if (bit == 0) return 32; #ifdef __has_builtin return __builtin_ctz(bit); #else return ctz32_(bit); #endif }; inline int ctz64_(uint64_t bit) { static const int table[] = { 0, 1, 2, 7, 3, 13, 8, 19, 4, 25, 14, 28, 9, 34, 20, 40, 5, 17, 26, 38, 15, 46, 29, 48, 10, 31, 35, 54, 21, 50, 41, 57, 63, 6, 12, 18, 24, 27, 33, 39, 16, 37, 45, 47, 30, 53, 49, 56, 62, 11, 23, 32, 36, 44, 52, 55, 61, 22, 43, 51, 60, 42, 59, 58, }; static const uint64_t de_bruijn = 0x0218a392cd3d5dbfull; bit &= ~bit + 1; return table[(bit * de_bruijn) >> 58]; }; inline int ctz64(uint64_t bit) { if (bit == 0) return 64; #ifdef __has_builtin return __builtin_ctzll(bit); #else return ctz64_(bit); #endif };