描述
Write a function that reverses a string. The input string is given as an array of characters s.
You must do this by modifying the input array in-place with O(1) extra memory.
测试用例
Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]题解
进行数组内的元素交换。
var reverseString = function(s) {
let n = Math.floor(s.length / 2), l = s.length;
for(let i = 0; i < n; i++) {
let temp = s[i];
s[i] = s[l - i - 1];
s[l - i - 1] = temp;
}
};结果
Accepted
477/477 cases passed (168 ms)
Your runtime beats 15.06 % of javascript submissions
Your memory usage beats 5.18 % of javascript submissions (50.4 MB)
