摘要：
Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each row must contain the dig 阅读全文
摘要：
Given a sorted array of distinct integers and a target value, return the index if the target is found. If not, return the index where it would be if i 阅读全文
摘要：
Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target value. If target is not found in th 阅读全文
摘要：
You are given an integer array nums sorted in ascending order, and an integer target. Suppose that nums is rotated at some pivot unknown to you before 阅读全文