[抄题]:

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.

[暴力解法]:

时间分析:

空间分析:

[优化后]:

时间分析:

空间分析:

[奇葩输出条件]:

[奇葩corner case]:

[思维问题]:

没见过,不会

[一句话思路]:

正常操作后判断位数能不能对上

[输入量]:空: 正常情况:特大:特小:程序里处理到的特殊情况:异常情况(不合法不合理的输入):

[画图]:

[一刷]:

  1. 用while循环,因为最后要差也就之差了一位数

[二刷]:

[三刷]:

[四刷]:

[五刷]:

[五分钟肉眼debug的结果]:

[总结]:

正常操作后判断位数能不能对上

[复杂度]:Time complexity: O(n) Space complexity: O(1)

[英文数据结构或算法,为什么不用别的数据结构或算法]:

[关键模板化代码]:

直接用能不能对上来返回:

//return, check
return i == n - 1;

[其他解法]:

[Follow Up]:

[LC给出的题目变变变]:

[代码风格] :

class Solution {
public boolean isOneBitCharacter(int[] bits) {
//ini
int n = bits.length;
int i = 0; //cc
if (bits == null || n == 0) {
return false;
} //while loop
while (i < n - 1) {
if (bits[i] == 0) {
i++;
}else {
i += 2;
}
} //return, check
return i == n - 1;
}
}
05-11 20:51