LeetCode 344. Reverse String

[quinnwencn]

Description

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.

Example 1:

Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]
Example 2:

Input: s = ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]

Constraints:

1 <= s.length <= 105
s[i] is a printable ascii character.

[quinnwencn]

Analysis

Solution written in Cpp

class Solution {
public:
    void reverseString(vector<char>& s) {
        int left = 0, right = s.size() - 1;
        while (left < right) {
            std::swap(s[left], s[right]);
            left++;
            right--;
        }
    }
};

Solution written in Rust

impl Solution {
    pub fn reverse_string(s: &mut Vec<char>) {
        s.reverse();
    }
}