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Leetcode 67: Add Binary
You are given two binary strings, a and b. Each string represents a binary number. Your task is to compute their sum and return it as a binary string.
Leetcode 71: Simplify Path
Given an absolute path for a Unix-style file system, simplify the path by following Unix file system rules. Handle ‘.’ and ‘..’ as current and parent directories, and multiple slashes as a single slash. Return the simplified canonical path.
Leetcode 72: Edit Distance
Given two strings str1 and str2, your task is to determine the minimum number of operations required to transform str1 into str2. The allowed operations are: Insert a character, Delete a character, and Replace a character.
Leetcode 79: Word Search
You are given a 2D grid board containing characters and a string word. The task is to determine whether the given word can be formed by starting at any cell in the grid and moving to adjacent cells, which are horizontally or vertically neighboring. The same cell cannot be reused in forming the word.
Leetcode 91: Decode Ways
You have intercepted a string of numbers that encodes a message. The message is decoded using the following mapping:
“1” -> ‘A’, “2” -> ‘B’, … “26” -> ‘Z’.
However, there are multiple ways to decode the string, as some numbers can represent a single letter (e.g., ‘1’ for ‘A’, ‘12’ for ‘L’). Your task is to return the number of possible ways to decode the string. Note that strings containing invalid encodings (e.g., starting with zero or having codes larger than 26) should not be considered valid.
