numbstorm的博客

题目描述： Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.For "(()", the longest valid parentheses substring is "()", w

题目描述： Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. For example, given the following matrix: 1 0 1 0 0 1 0 1 1 1 1 1 1 1

题目描述： Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. For example, Given [0,1,0,2,1,0,1,3

题目描述： Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram. (给定n个非负整数表示柱状图的条高如果每个条的宽度为1

题目描述： Implement a basic calculator to evaluate a simple expression string.The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and emp

题目描述：Given a string containing just the characters '(', ')', '{', '}', '[' and ']',                 determine if the input string is valid.                 The brackets(括号)must close in the correc