344. Reverse String
Write a function that reverses a string. The input string is given as an array of characters char[].
Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
You may assume all the characters consist of printable ascii characters.
Example 1:
Input: ["h","e","l","l","o"] Output: ["o","l","l","e","h"]
Example 2:
Input: ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"]
Rust Solution
struct Solution;
impl Solution {
fn reverse_string(s: &mut Vec<char>) {
s.reverse();
}
}
#[test]
fn test() {
let mut input: Vec<char> = vec![];
let output: Vec<char> = vec![];
Solution::reverse_string(&mut input);
assert_eq!(input, output);
let mut input: Vec<char> = vec!['h', 'e', 'l', 'l', 'o'];
let output: Vec<char> = vec!['o', 'l', 'l', 'e', 'h'];
Solution::reverse_string(&mut input);
assert_eq!(input, output);
}
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