摘要：
You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality c 阅读全文
摘要：
A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59). Each LED represents 阅读全文
摘要：
https://www.cnblogs.com/wuyuegb2312/p/3273337.html#intro https://www.cnblogs.com/bigmoyan/p/4521683.html 阅读全文
摘要：
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Note: 因为在题目中说要call很多次sumRange，所以每次单独的循环 阅读全文