HackPoint

import {
  BrowserRouter,
  Navigate,
  useNavigate,
  useRoutes,
} from "react-router-dom";
import { ErrorBoundary } from "src/components/ErrorBoundary";
import { PageLayout } from "src/components/pageLayout/pageLayout";
import {
  BooksContextProvider,

HackPoint

function permute(word, pattern, permutations = []) {
    if(word.length === 0) {
        permutations.push(pattern);
    }

    for(let i = 0; i < word.length; i++) {
        let char = word[i];

        let left = word.slice(0, i);
        let right = word.slice(i + 1);

HackPoint

/**
 * Definition for a binary tree node.
 * class TreeNode {
 *     val: number
 *     left: TreeNode | null
 *     right: TreeNode | null
 *     constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
 *         this.val = (val===undefined ? 0 : val)
 *         this.left = (left===undefined ? null : left)
 *         this.right = (right===undefined ? null : right)

HackPoint

class TreeNode {
  val: number
  left: TreeNode | null
  right: TreeNode | null
  constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
      this.val = (val===undefined ? 0 : val)
      this.left = (left===undefined ? null : left)
      this.right = (right===undefined ? null : right)
  }
}

HackPoint

/**
 Do not return anything, modify nums1 in-place instead.
 */
function merge(nums1: number[], m: number, nums2: number[], n: number): void {
    while (n) {
        if (nums1[m - 1] > nums2[n - 1]) {
          nums1[m + n - 1] = nums1[--m];  
        } else {
          nums1[m + n - 1] = nums2[--n];   
        }

HackPoint

// a.k.a famous fibbonaci
function climbStairs(n: number): number {
  if (n <= 1) {
    return 1;
  }

  return climbStairs(n - 1) + climbStairs(n - 2);
};

HackPoint

class ListNode {
    val: number;
    next: ListNode | null;
    constructor(val?: number, next?: ListNode|null) {
       this.val = (val===undefined ? 0 : val);
       this.next = (next===undefined ? null : next);
    }
}
function deleteDuplicates(head: ListNode | null): ListNode | null {
   if(head === null || head.next === null) return head;

HackPoint

/**
 * Definition for singly-linked list.
 * class ListNode {
 *     val: number
 *     next: ListNode | null
 *     constructor(val?: number, next?: ListNode | null) {
 *         this.val = (val===undefined ? 0 : val)
 *         this.next = (next===undefined ? null : next)
 *     }
 * }

HackPoint

function mySqrt(x: number): number {
    let temp = 0;
    let sqrt = x / 2;
    
    while(temp !== sqrt) {
        temp = sqrt;
        sqrt = (x / temp + temp) / 2;
    }
    
    return sqrt;

HackPoint

function addBinary(a: string, b: string): string {
    return (BigInt(`0b${a}`) + BigInt(`0b${b}`)).toString(2);
};

console.log(addBinary("11","1")); // output: 100
console.log(addBinary("1010","1011")); // output: 10101