LeetCode 821 Shortest Distance to a Character 解题报告

题目要求

Given a string S and a character C, return an array of integers representing the shortest distance from the character C in the string.

Note:

1. S string length is in [1, 10000].
2. C is a single character, and guaranteed to be in string S.
3. All letters in S and C are lowercase.

题目分析及思路

题目给出一个字符串和一个字符，要求得到字符串中每一个字符和该字符的最短距离。可以先得到已知字符的所有索引，再遍历字符串得到每一个字符与该字符的最短距离。

python代码

class Solution:

def shortestToChar(self, S: 'str', C: 'str') -> 'List[int]':

index = []

res = []

for i, v in enumerate(S):

if v == C:

index.append(i)

for i, v in enumerate(S):

res.append(min(list(map(lambda x:abs(x-i), index))))

return res