MohammedALREAI

import config, { IConfig } from 'config';
import mongoose, { Mongoose } from 'mongoose';
import {EventEmitter} from"events"
const dbConfig: IConfig = config.get('App.database');
import Logger from'./lib/logger'



class DatabaseService {
  public static emitter: EventEmitter = new EventEmitter();

MohammedALREAI

/**
 * 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)
 *     }
 * }

MohammedALREAI

/**
 * 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)
 *     }
 * }

MohammedALREAI

/**
 * 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)

MohammedALREAI

    function singleNumber(nums: number[]):number {
    let map=new Map<number,number>()
    for (const num of nums) {
        if (map.has(num)) {
            const nextCount = map.get(num) as number + 1
            if (nextCount === 3) {
                map.delete(num)
            } else {
                map.set(num, nextCount)
            }

MohammedALREAI

function singleNumber(nums: number[]) {

     let set= new Set<number>();
        for(let i of nums){
            if(set.has(i)){
                set.delete(i);
            }else{
                set.add(i);
            }
        }

MohammedALREAI

// /
//  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)

MohammedALREAI

function rotateImage(a: number[][]): number[][] {
    swap(a)
           reflext90(a)
           return a
           }

function swap(a:number[][]):void{
    let row=a.length;
  let col=a[0].length;
  for(let i = 0; i < row; i ++) {

MohammedALREAI

function firstDuplicate(a: number[]=[2, 1, 3, 5, 3, 2]): number {


 let set = new Set()
    for (let e of a){
        if (set.has(e))
            return e
        else
            set.add(e)
            }

MohammedALREAI

interface Imap{
    [key:string]:number
}

function firstNotRepeatingCharacter(s: string="abacabad"): string {


 let map:Imap ={}
    for (let e of s){
        if(e in map){