LeetCode 200. Number of Islands [Swift 题解]
题目 Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed »
LeetCode 3. Longest Substring Without Repeating Characters [Swift 题解]
题目 Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with »
LeetCode 736. Parse Lisp Expression [Swift 题解]
题目 You are given a string expression representing a Lisp-like expression to return the integer value of. The syntax for these expressions is given as follows. »
LeetCode 146. LRU Cache [Swift 题解]
题目 Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and put. get(key) - Get »
LeetCode 403. Frog Jump [Swift 题解]
题目 A frog is crossing a river. The river is divided into x units and at each unit there may or may not exist a stone. »