題目： 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】線段樹，這個題目是在他的blog介紹的 文字沒有參考別人的成分 題目大意：Hotel有N（1 ≤ N ≤ 50,000）間rooms，並且所有的rooms都 ...

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

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