题目： Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its uppe ...

最近一直在看胡浩的【完全版】线段树，这个题目是在他的blog介绍的 文字没有参考别人的成分 题目大意：Hotel有N（1 ≤ N ≤ 50,000）间rooms，并且所有的rooms都 ...

题目： You are given an integer array nums and you have to return a new counts array. The counts array ...

题目: Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), incl ...