摘要：
Motivation: Given a 1D array of n elements. [2, 5, -1, 3, 6] range sum query: what's the sum from 2nd element to 4th element query(2, 4)? 5 + (-1) + 3 阅读全文
摘要：
You are given an integer array nums and you have to return a new counts array. The counts array has the property where counts[i] is the number of smal 阅读全文