---
title: leetcode-compress-string-lcci
date: 2020-04-01 15:51:22
tags:
categories: leetcode
---

### 面试题 01.06. 字符串压缩

[题目](https://leetcode-cn.com/problems/compress-string-lcci/)

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遍历一遍字符串，遇到跟上一个字符不同的字符时记录上一个字符的重复长度。



```python
class Solution:
  def compressString(self, S: str) -> str:
    if not S:
      return S
    c = ''
    prev = S[0]
    p_len = 1
    for w in S[1:]:
      if w != prev:
        c += '%s%s' % (prev, p_len)
        prev = w
        p_len = 1
      else:
        p_len += 1
    c += '%s%s' % (prev, p_len)
    if len(S) > len(c):
      return c
    return S
# 52 ms	13.8 MB
```