【LeetCode868】二进制间距

目录题目解法一、双指针解法二、尾零个数题目解法一、双指针int max(int a, int b) { return a b ? a : b; } int max_gap(unsigned int n) { int prev -1; int curr 0; int len 0; while (n) { if (n 0x01) { if (prev ! -1) len max(len, curr - prev); prev curr; } curr; n 1; } return len; } int binaryGap(int n) { return max_gap(n); }解法二、尾零个数int max(int a, int b) { return a b ? a : b; } int ctz(unsigned int x) { int cnt 0; if (!(x 0x0000FFFF)) { cnt 16; x 16; } if (!(x 0x000000FF)) { cnt 8; x 8; } if (!(x 0x0000000F)) { cnt 4; x 4; } if (!(x 0x00000003)) { cnt 2; x 2; } if (!(x 0x00000001)) { cnt 1; x 1; } return cnt; } int max_gap(unsigned int n) { int shift ctz(n) 1; int len 0; n shift; while (n) { shift ctz(n) 1; len max(len, shift); n shift; } return len; } int binaryGap(int n) { return max_gap(n); }