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 char[] 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。
你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。
示例 1:
输入:["h","e","l","l","o"] 输出:["o","l","l","e","h"] 示例 2:
输入:["H","a","n","n","a","h"] 输出:["h","a","n","n","a","H"]
var reverseString = function(s) {
let left = 0
let right = s.length - 1
while(left < right) {
[s[right], s[left]] = [s[left], s[right]]
left++
right--
}
return s
};
解题思路: 双指针