James Pan

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/best-meeting-point/A group of two or more people wants to meet and minimize the total travel distance. You are given a 2D grid of values 0 or 1, where each 1 m

原题网址：https://leetcode.com/problems/design-hit-counter/Design a hit counter which counts the number of hits received in the past 5 minutes.Each function accepts a timestamp parameter (in seco

原题网址：https://leetcode.com/problems/max-sum-of-sub-matrix-no-larger-than-k/Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is