摘要：【题目】 There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of th 阅读全文

摘要：【题目】 Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target? Find all uni 阅读全文

摘要：【题目】 Given a collection of distinct integers, return all possible permutations. 数组的组合情况。 【思路】 求子集，排列组合的数组题有固定模板。 【代码】 阅读全文

摘要：【题目】 Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set). Note: The solution set must not 阅读全文

摘要：【题目】 Given a set of distinct integers, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate subsets. 求 阅读全文

摘要：【题目】 Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives 阅读全文

摘要：【题目】 Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transa 阅读全文