摘要：
Score of Parentheses (M) 题目 Given a balanced parentheses string S, compute the score of the string based on the following rule: () has score 1 AB has 阅读全文
摘要：
Search a 2D Matrix II (M) 题目 Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Inte 阅读全文
摘要：
Longest Word in Dictionary through Deleting (M) 题目 Given a string and a string dictionary, find the longest string in the dictionary that can be forme 阅读全文
摘要：
Broken Calculator (M) 题目 On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number o 阅读全文
摘要：
Minimum Remove to Make Valid Parentheses (M) 题目 Given a string s of '(' , ')' and lowercase English characters. Your task is to remove the minimum num 阅读全文
摘要：
Arithmetic Slices (M) 题目 A sequence of numbers is called arithmetic if it consists of at least three elements and if the difference between any two co 阅读全文
摘要：
Letter Case Permutation (M) 题目 Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string. Ret 阅读全文
摘要：
The K Weakest Rows in a Matrix (E) 题目 Given a m * n matrix mat of ones (representing soldiers) and zeros (representing civilians), return the indexes 阅读全文
摘要：
Is Graph Bipartite? (M) 题目 Given an undirected graph, return true if and only if it is bipartite. Recall that a graph is bipartite if we can split its 阅读全文
摘要：
Shortest Path in Binary Matrix (M) 题目 In an N by N square grid, each cell is either empty (0) or blocked (1). A clear path from top-left to bottom-rig 阅读全文