James Pan

原题网址:https://leetcode.com/problems/maximum-size-subarray-sum-equals-k/Given an array nums and a target value k, find the maximum length of a subarray that sums to k. If there isn't one, return 0

原题网址：https://leetcode.com/problems/longest-substring-with-at-most-k-distinct-characters/Given a string, find the length of the longest substring T that contains at most k distinct characters.

原题网址：https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to

原题网址：https://leetcode.com/problems/meeting-rooms-ii/Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of confe

原题网址：https://leetcode.com/problems/insert-interval/Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals w

原题网址：https://leetcode.com/problems/merge-intervals/Given a collection of intervals, merge all overlapping intervals.For example,Given [1,3],[2,6],[8,10],[15,18],return [1,6],[8,10],[15,1

原题网址：https://leetcode.com/problems/maximum-subarray/Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [−2,1

原题网址：https://leetcode.com/problems/summary-ranges/Given a sorted integer array without duplicates, return the summary of its ranges.For example, given [0,1,2,4,5,7], return ["0->2","4->5","7

https://leetcode.com/problems/number-of-islands/Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting

原题网址：https://leetcode.com/problems/longest-consecutive-sequence/Given an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given [100, 4,

原题网址：https://leetcode.com/problems/range-sum-query-2d-immutable/Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lowe

原题网址：https://leetcode.com/problems/range-sum-query-immutable/Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.Example:Given nums = [-2

原题网址：https://leetcode.com/problems/smallest-rectangle-enclosing-black-pixels/An image is represented by a binary matrix with 0 as a white pixel and 1 as a black pixel. The black pixels are con

原题网址：https://leetcode.com/problems/binary-tree-longest-consecutive-sequence/Given a binary tree, find the length of the longest consecutive sequence path.The path refers to any sequence

原题网址：https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/Given a string, find the length of the longest substring T that contains at most 2 distinct characters.

原题网址：https://leetcode.com/problems/patching-array/Given a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n] inclusive ca