levichen

var chai = require('chai');
var expect = chai.expect;

describe('Test Two Sum', function() {
  it('Expect result will be [0, 1]', function() {
    var nums = [2, 7, 11, 15];
    var target = 9
    var result = twoSum(nums, target);
  
    expect(result).to.deep.equal([0, 1]);

levichen

/**
 *  * @param {number[]} nums
 *  * @param {number} target
 *  * @return {number[]}
 * */
var twoSum = function(nums, target) {
  for (var i = 0; i<=nums.length; i++) {
    for (var j =i+1; j<=nums.length; j++) {
      if (nums[i] + nums[j] === target) return [i, j];
    }

levichen

/**
 *  * @param {number[]} nums
 *  * @param {number} target
 *  * @return {number[]}
 * */
var twoSum = function(nums, target) {
  var map = [];

  for (var i=0; i<nums.length; i++) {
    var value = nums[i];

levichen

/**
 * @param {number[]} nums
 * @return {number}
 */
var singleNumber = function(nums) {
  nums.sort();

  for (var i=0; i<nums.length; i=i+2) {
    if (nums[i] !== nums[i+1]) return nums[i];
  }

levichen

/**
 * @param {number[]} nums
 * @return {number}
 */
var singleNumber = function(nums) {
  var result = 0;

  for (var i=0; i<nums.length; i++) {
    result = result ^ nums[i];
  }

levichen

var chai = require('chai');
var expect = chai.expect;

describe('Test Single Number', function() {
  it('Test1', function() {
    var input = [1, 2, 2, 3, 1];
    var result = singleNumber(input);
  
    expect(result).to.equal(3);
  });

levichen

/**
 * Definition for singly-linked list.
 * function ListNode(val) {
 *     this.val = val;
 *     this.next = null;
 * }
 */

/**
 * @param {ListNode} head

levichen

//  Definition for singly-linked list.
function ListNode(val) {
  this.val = val;
  this.next = null;
}

var chai = require('chai');
var expect = chai.expect;

describe('Test has cycle', function () {

levichen

/**
 * @param {string} s
 * @return {number}
 */

var mStr = "-ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var num = 26;

var titleToNumber = function(s) {
    var result = 0;

levichen

/**
 * @param {string} s
 * @return {number}
 */

var mStr = "-ABCDEFGHIJKLMNOPQRSTUVWXYZ";

var titleToNumber = function(s) {
    var result = 0;