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344. 反转字符串 #49

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webVueBlog opened this issue Aug 31, 2022 · 0 comments
Open

344. 反转字符串 #49

webVueBlog opened this issue Aug 31, 2022 · 0 comments

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@webVueBlog
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344. 反转字符串

Description

Difficulty: 简单

Related Topics: 递归, 双指针, 字符串

编写一个函数,其作用是将输入的字符串反转过来。输入字符串以字符数组 s 的形式给出。

不要给另外的数组分配额外的空间,你必须修改输入数组、使用 O(1) 的额外空间解决这一问题。

示例 1:

输入:s = ["h","e","l","l","o"]
输出:["o","l","l","e","h"]

示例 2:

输入:s = ["H","a","n","n","a","h"]
输出:["h","a","n","n","a","H"]

提示:

  • 1 <= s.length <= 105
  • s[i] 都是 码表中的可打印字符

Solution

Language: JavaScript

/**
 * @param {character[]} s
 * @return {void} Do not return anything, modify s in-place instead.
 */
// 双指针
// var reverseString = function(s) {
//     const n = s.length;
//     for (let left = 0, right = n - 1; left < right; left++, right--) {
//         [s[left], s[right]] = [s[right], s[left]]
//     }
// };

var reverseString = function(s) {
    let left = 0, right = s.length - 1
    while (left < right) {
        [s[left], s[right]] = [s[right], s[left]]
        left++
        right--
    }
}
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