反转字符串
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,你必须原地修改输入数组、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"]
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/**
* @param {character[]} s
* @return {void} Do not return anything, modify s in-place instead.
*/
var reverseString = function(s) {
let l = 0
let r = s.length - 1
while (l <= r) {
let temp = s[l]
s[l] = s[r]
s[r] = temp
l++
r--
}
return s
};
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来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/reverse-string