201. Bitwise AND of Numbers Range
201. Bitwise AND of Numbers Range
class Solution:
def rangeBitwiseAnd(
Bit Manipulation
190. Reverse Bits
190. Reverse Bits
class Solution:
def reverseBits(self, n: int)
405. Convert a Number to Hexadecimal
405. Convert a Number to Hexadecimal
💡這個題目有一個知識點需要先複習：「二補數」
class Solution:
504. Base 7
504. Base 7
class Solution:
def convertToBase7(self, num: int)
191. Number of 1 Bits
191. Number of 1 Bits
每次檢查該整數的 bit 值的最右一位數是不是 1 ，如果是的話計數器就可以加
7. Reverse Integer
7. Reverse Integer
class Solution:
def reverse(self, x: int)
136. Single Number
136. Single Number
這題的想法是用消去法，很像是抽鬼牌，每次只要有成對的牌就消去，直到最後一張就是鬼牌了（答案）
class Solution: