tatsuyax25

/**
 * Definition for a binary tree node.
 * function TreeNode(val, left, right) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.left = (left===undefined ? null : left)
 *     this.right = (right===undefined ? null : right)
 * }
 */
/**
 * @param {number[]} preorder

tatsuyax25

/**
 * Definition for a binary tree node.
 * function TreeNode(val, left, right) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.left = (left===undefined ? null : left)
 *     this.right = (right===undefined ? null : right)
 * }
 */
/**
 * @param {string} traversal

tatsuyax25

/**
 * Definition for a binary tree node.
 * function TreeNode(val, left, right) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.left = (left===undefined ? null : left)
 *     this.right = (right===undefined ? null : right)
 * }
 */
/**
 * @param {TreeNode} root

tatsuyax25

/**
 * @param {string[]} nums
 * @return {string}
 */
var findDifferentBinaryString = function(nums) {
    const n = nums.length;
    const numsSet = new Set(nums);

    // Generate all possible binary strings of length n
    for (let i = 0; i < 2 ** n; i++) {

tatsuyax25

/**
 * @param {number} n
 * @param {number} k
 * @return {string}
 */
var getHappyString = function(n, k) {
    // Helper function to perform backtracking and generate all happy string
    function backtrack(current, result) {
        // If the current string has reached the desired length, add it to the result list
        if (current.length === n) {

tatsuyax25

/**
 * @param {string} pattern
 * @return {string}
 */
var smallestNumber = function(pattern) {
    const n = pattern.length;
    const result = [];
    const stack = [];

    for (let i = 0; i <= n; i++) {

tatsuyax25

/**
 * @param {string} tiles
 * @return {number}
 */
var numTilePossibilities = function(tiles) {
     // Helper function for backtracking
    function backtrack(path, remaining) {
        // If the current path is not empty, add it to the set of unique sequences
        if (path.length > 0) {
            uniqueSequences.add(path.join(''));

tatsuyax25

/**
 * @param {number} n
 * @return {number[]}
 */
var constructDistancedSequence = function(n) {
    // Initialize the sequence array with 0s and an array to track placed numbers
    const seq = new Array(n * 2 - 1).fill(0), isPlaced = new Array(n + 1).fill(false);
    // Mark index 0 as placed (not used in actual sequence)
    isPlaced[0] = true;

tatsuyax25

/**
 * @param {number} n
 * @return {number}
 */
// Function to check if the string representation of a number can be partitioned
// into contiguous substrings that sum to a target value
function canPartition(numStr, target) {
    // Helper function to perform backtracking
    function backtrack(index, currentSum) {
        // If we've reached the end of the string, check if the current sum equals the target

tatsuyax25

var ProductOfNumbers = function() {
    // Initialize an array to store the prefix products
    this.prefixProduct = [1]; // Start with 1 to handle the empty product case
};

/** 
 * @param {number} num
 * @return {void}
 */