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ReverseString.ST.js
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ReverseString.ST.js
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/*
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"]
*/
function reverseString(s) {
const idxPointer = 0;
while (idxPointer < s.length - idxPointer) {
const tempVal = s[idxPointer];
s[idxPointer] = s[(s.length-1) - idxPointer];
s[(s.length-1) - idxPointer] = tempVal;
}
return s;
}
/**
* Runtime: 144 ms, faster than 43.92% of JavaScript online submissions for Reverse String.
* Memory Usage: 46.8 MB, less than 70.75% of JavaScript online submissions for Reverse String.
*/