# 717. 1-bit and 2-bit Characters 1 比特与 2 比特字符

@TOC

## # 题目描述

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. 1 <= len(bits) <= 1000.
2. bits[i] is always 0 or 1.

## # 解题方法

### # 遍历

``````"""
class Solution(object):
def isOneBitCharacter(self, bits):
"""
:type bits: List[int]
:rtype: bool
"""
pos = 0
while pos < len(bits) - 1:
if bits[pos] == 1:
pos += 2
else:
pos += 1
return pos == len(bits) - 1 and bits[pos] == 0
``````

``````class Solution(object):
def isOneBitCharacter(self, bits):
"""
:type bits: List[int]
:rtype: bool
"""
pos = 0
while pos < len(bits) - 1:
pos += 2 if bits[pos] == 1 else 1
return pos == len(bits) - 1
``````

## # 日期

2018 年 1 月 22 日 2018 年 11 月 14 日 —— 很严重的雾霾