717. 1-bit and 2-bit Characters
We have two special characters. The first character can be represented by one bit 0. The second character can be represented by two bits (10 or 11). Now given a string represented by several bits. Return whether the last character must be a one-bit character or not. The given string will always end with a zero. Example 1: Input: bits = [1, 0, 0] Output: True Explanation: The only way to decode it is two-bit character and one-bit character. So the last character is one-bit character. Example 2: Input: bits = [1, 1, 1, 0] Output: False Explanation: The only way to decode it is two-bit character and two-bit character. So the last character is NOT one-bit character. Note: 1 <= len(bits) <= 1000. bits[i] is always 0 or 1.
- 时间复杂度: O(N)- 空间复杂度: O(1)
def isOneBitCharacter(self, bits: List[int]) -> bool:
def helper(bits): # 返回bits是否可以成功decode
if not bits:
if len(bits) == 1:
if bits == 0: