leetcode 解题思路

A storekeeper is a game in which the player pushes boxes around in a warehouse trying to get them to target locations.The game is represented by anm x ngrid of charactersgridwhere each element is a wall, floor, or box.Your task is to move the box'...

You are given therootof abinary treewithnnodes. Each node is uniquely assigned a value from1ton. You are also given an integerstartValuerepresenting the value of the start nodes, and a different integerdestValuerepresenting the value of the d...

Return thelengthof the shortest, non-empty, contiguoussubarray ofAwith sum at leastK.If there is no non-empty subarray with sum at leastK, return-1.Example 1:Input: A = [1], K = 1Output: 1Example 2:Input: A = [1,2], K = 4Output: -1...

Design a hit counter which counts the number of hits received in the past 5 minutes.Each function accepts a timestamp parameter (in seconds granularity) and you may assume that calls are being mad

Implement a web logger, which provide two methods:hit(timestamp), record a hit at given timestamp. get_hit_count_in_last_5_minutes(timestamp), get hit count in last 5 minutes.the two methods will ...

Given an arraynums, there is a sliding window of sizekwhich is moving from the very left of the array to the very right. You can only see theknumbers in the window. Each time the sliding window...