Parentheses 题目描述 Dave loves strings consisting only of '(' and ')'. Especially, he is interested in balanced strings. Any balanced strings can be constructed using the following rules: A string "()" is balanced.Concatenation of two balanced stri…
Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. The valid operators are +, -and *. Example 1 Input: "2-1-1". ((2-1)-1) = 0 (2-(1-1)) = 2 Output: …
题目来源 https://leetcode.com/problems/longest-valid-parentheses/ Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. 题意分析 Input:str Output:length Conditions:返回最长有效子串 有效:符合括…
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: "((()))", "(()())", "(())()", "()(())", "()()()" 本题的关键在于…
Given a balanced parentheses string S, compute the score of the string based on the following rule: () has score 1 AB has score A + B, where A and B are balanced parentheses strings. (A) has score 2 * A, where A is a balanced parentheses string. Exam…
描述 Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: [ "((()))", "(()())", "(())()", "()(())", "()()()" ]…
Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. The valid operators are +, - and *. Example 1: Input: "2-1-1" Output: [0, 2] Explanation: ((2-1)-…
算法面试过程中,题目类型多,数量大.大家都不可避免的会在LeetCode上进行训练.但问题是,题目杂,而且已经超过1300道题. 全部刷完且掌握,不是一件容易的事情.那我们应该怎么办呢?找规律,总结才是制胜法宝. 下面我们就来看看 Grokking the Coding Interview: Patterns for Coding Questions 的分类及每个类型的经典题目: 1. Pattern: Sliding window,滑动窗口类型 经典题目: Maximum Sum Subar…
