Tag archives for Swift

  1. LeetCode in Swift: Word Search

    Problem Statement Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cell, where “adjacent” cells are those horizontally or vertically neighboring. The same letter cell may not be used more than once. For example, Given board =

    word Continue reading...

  2. LeetCode in Swift: Reverse Words in a String

    Problem Statement Given an input string, reverse the string word by word. For example: Given s = “ the sky is blue”, return “ blue is sky the”. Clarification: What constitutes a word? A sequence of non-space characters constitutes a word. Could the input string contain leading or trailing spaces? Yes. However, your reversed string should not contain leading or trailing spaces. How Continue reading...

  3. LeetCode in Swift: Binary Tree Level Order Traversal II

    Problem Statement Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, from left to right, level by level from leaf to root). For example: Given binary tree {3,9,20,#,#,15,7},

    return its bottom-up level order traversal as:

    Original LeetCode problem page My Solution in Swift Continue reading...

  4. LeetCode in Swift: Binary Tree Level Order Traversal

    Problem Statement Given a binary tree, return the level order traversal of its nodes’ values. (ie, from left to right, level by level). For example: Given binary tree {3,9,20,#,#,15,7},

    return its level order traversal as:

    Original LeetCode problem page My Solution in Swift Continue reading...

  5. LeetCode in Swift: Insertion Sort List

    Problem Statement Sort a linked list using insertion sort. Original LeetCode problem page My Solution in Swift Every time after inserting a list node, I use a variable to record the reference to that node. When next uninserted list node comes in, it checks from the recorded last inserted node instead of restarting the checking from the head list node. Continue reading...