dfs

Finding grid coordinates that drain to both oceans using reverse DFS from ocean boundaries in Python

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

A WordDictionary implementation using a Trie for storage and DFS for wildcard search

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 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

Solving BST range sum through BFS, DFS, and prefix sums