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 empty spaces .
You may assume that the ...
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[LeetCode]Basic Calculator
[LeetCode]Rectangle Area
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LeetCode.
题目描述：
Find the total area covered by two rectilinear rectangles in a 2D plane.
Each rectangle is defined by its bottom left corner and top right corner as shown in the figure.
![[LeetCode]Rectangle Area](https://leetcode.com/static/images/problemset/rectangle_area.png)
Assume that the total area is never beyond ...
[LeetCode]Count Complete Tree Nodes
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LeetCode.
题目描述：
Given a complete binary tree, count the number of nodes.
Definition of a complete binary tree from Wikipedia:
In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level ...
[LeetCode]Contains Duplicate III
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LeetCode.
题目描述：
Given an array of integers, find out whether there are two distinct indices i and j in the array such that the difference between nums[i] and nums[j] is at most t and the difference between i and j is ...
[LeetCode]Maximal Square
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LeetCode.
题目描述：
Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area.
For example, given the following matrix:
1 0 1 0 0 1 0 1 1 1 1 1 ...