recursion

Deep copying an undirected graph using a hash map and DFS recursion in Python

A Python DFS and memoization solution that stores the minimum coin count for each remaining amount

A Python DFS and backtracking solution that marks visited board cells in place

A Python DFS solution that compares the depths of the left and right subtrees

A Python recursion and memoization solution that counts valid one-digit and two-digit decodings

A Python backtracking solution to Combination Sum using a start index and pruning

A DFS Python solution for checking whether a BST is built with valid value ranges

A recursion and memoization write-up for the Climbing Stairs problem.

Solving the rob-or-skip choice with top-down DP and memoization