tatsuyax25

/**
 * Calculates the number of ways to tile a 2 × n board using dominos and trominos.
 * @param {number} n - The width of the board.
 * @return {number} - The number of valid tilings, modulo 10^9 + 7.
 */
var numTilings = function (n) {
    const MOD = 1e9 + 7; // Modulo constraint to prevent overflow

    // Base cases for small values of n
    if (n === 1) return 1; // Only one vertical domino fits

tatsuyax25

/**
 * Counts the number of equivalent domino pairs.
 * Two dominoes are equivalent if they have the same numbers, regardless of order.
 * 
 * @param {number[][]} dominoes - A list of domino pairs represented as 2-element arrays.
 * @return {number} - The total number of equivalent domino pairs.
 */
var numEquivDominoPairs = function(dominoes) {
    // If there are no dominoes, return 0
    if (!dominoes || dominoes.length === 0) {

tatsuyax25

/**
 * Finds the most frequently occurring number in an array.
 * @param {number[]} arr - The input array of numbers.
 * @return {Object} An object containing the most common item and its count.
 */
function getMostFrequentNumber(arr = []) {
    let mostFrequent = arr[0];
    let frequencyMap = {};

    for (let num of arr) {

tatsuyax25

/**
 * Simulates the domino effect by computing the final state of a row of dominoes.
 * 
 * @param {string} dominoes - A string representing dominoes. 'L' falls left, 'R' falls right, '.' stays upright.
 * @return {string} - The final state of the dominoes after all forces are resolved.
 */
var pushDominoes = function(dominoes) {
    const n = dominoes.length;
    const forces = new Array(n).fill(0);

tatsuyax25

/**
 * Determines the maximum number of tasks that can be assigned given workers and pills.
 *
 * @param {number[]} tasks - Array of task difficulties.
 * @param {number[]} workers - Array of worker strengths.
 * @param {number} pills - Number of strength-boosting pills available.
 * @param {number} strength - Strength increase provided by each pill.
 * @return {number} - Maximum number of tasks that can be assigned.
 */
var maxTaskAssign = function(tasks, workers, pills, strength) {

tatsuyax25

/**
 * @param {number[]} nums
 * @return {number}
 */
var findNumbers = function(nums) {
    let count = 0; // Initialize a counter for numbers with an even number of digits

    for (let num of nums) { // Loop through each number in the array
        // Convert the number to a string (absolute value to handle negatives) and get its length
        let digitCount = Math.abs(num).toString().length;

tatsuyax25

/**
 * @param {number[]} nums
 * @param {number} k
 * @return {number}
 */
var countSubarrays = function(nums, k) {
    // Initialize an array to store the indices of the maximum elements and a variable to store the maximum element
    let indices = [], max = 0;

    // Iterate over the nums array

tatsuyax25

/**
 * @param {number[]} nums
 * @param {number} k
 * @return {number}
 */
var countSubarrays = function(nums, k) {
    let left = 0; // Left pointer of the sliding window
    let sum = 0; // Running sum of the current subarray
    let result = 0; // Stores the count of valid subarrays

tatsuyax25

/**
 * Counts the number of subarrays where the middle element 
 * is exactly half the sum of the first and last elements.
 *
 * @param {number[]} nums - An array of numbers.
 * @return {number} - The count of valid subarrays.
 */
var countSubarrays = function (nums) {
    let count = 0;

tatsuyax25

/**
 * @param {number[]} nums
 * @param {number} minK
 * @param {number} maxK
 * @return {number}
 */
var countSubarrays = function(nums, minK, maxK) {
    // Initialize variables to keep track of indices and result
    let minI = -1; // Index of the last occurrence of minK
    let maxI = -1; // Index of the last occurrence of maxK