03-30 LeetCode 74. Search a 2D Matrix 6 Approaches: Brute Force, Row Search, Column Search, One Binary Search, 2D Coordinate Axis
03-28 LeetCode 81. Search in Rotated Sorted Array II The Key of Binary Search Is Narrow the Search Interval
02-18 LeetCode 287. Find the Duplicate Number 9 Approaches：Brute Force, Count, Hash, In-place Marked, Sorting, Index Sort, Binary Search, Bit Manipulation, Fast Slow Pointers
01-08 LeetCode 69. Sqrt(x) 4 Approaches for Finding the Square Root of A Number: Brute Force, Exponent, Binary Search and the Newton Iteration Method