Palindromic Binary Representation

Min Cost Path

Find Nth Fibonacci

606. Construct String from Binary Tree

Given the root of a binary tree, construct a string consisting of parenthesis and integers from a binary tree with the preorder traversal way, and return it.

Omit all the empty parenthesis pairs that do not affect the one-to-one mapping relationship between the string and the original binary tree.

A - Antichain of Integer Strings

E - Takahashi and Animals

D - At Most 3 (Contestant ver.)

C - ABS Permutation (LIS ver.)

B - Shorten ARC

Codeforces Round #533 (Div. 2) C. Ayoub and Lost Array