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53 lines
905 B
Markdown
53 lines
905 B
Markdown
# [344. Reverse String](https://leetcode.com/problems/reverse-string/)
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## 题目
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Write a function that reverses a string. The input string is given as an array of characters char[].
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Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
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You may assume all the characters consist of printable ascii characters.
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**Example 1**:
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```
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Input: ["h","e","l","l","o"]
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Output: ["o","l","l","e","h"]
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```
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**Example 2**:
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```
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Input: ["H","a","n","n","a","h"]
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Output: ["h","a","n","n","a","H"]
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```
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## 题目大意
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题目要求我们反转一个字符串。
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## 解题思路
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这一题的解题思路是用 2 个指针，指针对撞的思路，来不断交换首尾元素，即可。
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## 代码
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```go
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package leetcode
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func reverseString(s []byte) {
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for i, j := 0, len(s)-1; i < j; {
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s[i], s[j] = s[j], s[i]
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i++
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j--
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}
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}
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``` |