Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
Make a Palindrome Number
Given two strings, find the maximum overlap
Calculate the area of a triangle between three points
sum of non-primes
Fix the last element of a cell array
Find the path through the cell
BLOCK x3 (Version 4)
Expression or variable?
Chess ELO rating system
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