Problems library (weekly updates)

Question
One Pass, Twice the Trouble
First Palindromic String
Identify Duplicated and Missing Numbers
Rainfall Wait Time
Maximize Product Minus One
Maximize Group Formation with Usage Limits
Longest Substring Between Identical Characters
Painting Fence Sections
Coin Picking Strategy
Rearrange Even and Odd Integers
Finding the Kth Best Performer in the Classroom
Game of Array Manipulation
Minimum Operations for Alternating String
Count Alternating Subarrays
Harvesting Apples from the Left Branches