编写一个函数，将输入的字符串反转过来。输入字符串以字符串数组 s 的形式给出。
不要给另外的数组分配额外的空间，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。
/**
* @param {character[]} s
* @return {void} Do not return anything, modify s in-place instead.
*/
var reverseString = function(s) {
let left = 0;
let right = s.length - 1;
while (left < right) {
let tmp = s[left];
s[left++] = s[right];
s[right--] = tmp;
}
};
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本文标题：344. Reverse String
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