NigelJu

class Solution {
    func isSubsequence(_ s: String, _ t: String) -> Bool {
        if s.count == t.count { return s == t }
        if s.count > t.count { return false }
        if s.count == 0 { return true }

        let tArray = Array(t)
        let sArray = Array(s)
        var sIndex = 0
        var tIndex = 0

NigelJu

class Solution {
    func isSubsequence(_ s: String, _ t: String) -> Bool {
        if s.count == t.count { return s == t }
        if s.count > t.count { return false }
        if s.count == 0 { return true }
        
        var tArray = Array(t)
        var sArray = Array(s)
        var sIndex = 0
        var tIndex = 0

NigelJu

//
//  MyView.swift
//  TestXib
//
//  Created by Nigel on 2018/7/8.
//  Copyright © 2018年 Nigel. All rights reserved.
//

import UIKit

NigelJu

class Solution {
    func canConstruct(_ ransomNote: String, _ magazine: String) -> Bool {

        if ransomNote.count == magazine.count  { return ransomNote == magazine }
        if ransomNote.count > magazine.count { return false }
        if ransomNote.count == 0 { return true }
        
        
        var mapping = [Character: Int]()
        for char in ransomNote {

NigelJu

class Solution {
    func canConstruct(_ ransomNote: String, _ magazine: String) -> Bool {

        if ransomNote.count == magazine.count  { return ransomNote == magazine }
        if ransomNote.count > magazine.count { return false }
        if ransomNote.count == 0 { return true }
        
        
        var mapping = [Character: Int]()
        for char in ransomNote {

NigelJu

class Solution {
    func singleNumber(_ nums: [Int]) -> Int {
            
        return nums.reduce(0, ^)
        
    }
}

NigelJu

class Solution {
    func singleNumber(_ nums: [Int]) -> Int {
        
        var mapping = [Int: Bool]()
        
        for num in nums {
            if let _ = mapping[num] {
                mapping[num] = true
            }else {
                mapping.updateValue(false, forKey: num)

NigelJu

class Solution {
    func sumOfLeftLeaves(_ root: TreeNode?) -> Int {
        return dfs(root: root, isLeft: false)
    }
    
    
    func dfs(root: TreeNode?, isLeft: Bool) -> Int {
        
        guard let root = root else { return 0 }
   

NigelJu

class Solution {
    func sumOfLeftLeaves(_ root: TreeNode?) -> Int {
        return dfs(root: root, isLeft: false)
    }
    
    func dfs(root: TreeNode?, isLeft: Bool) -> Int {
        
        guard let root = root else { return 0 }
        
        var result = 0

NigelJu

class Solution {
    func countSegments(_ s: String) -> Int {       
        return Array(s).split(separator: " ").count
    }
}