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Algorithms & data structures

Classic patterns — search, sort, stacks, queues, and practical complexity-aware code.

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Algorithms & data structures easy

Depth First Search Traversal Order in Python

Recursive depth-first search that returns the visit order of nodes in an adjacency list graph starting from a given node.

dfs graph traversal
Python 
def dfs_order(adj, start):
    visited = set()
    order = []

    def dfs(node):
        visited.add(node)
        order.append(node)
        for neighbor in adj.get(node, []):
            if neighbor not in visited:
                dfs(neighbor)

    dfs(start)
    return order


if __name__ == "__main__":
    # Dem…
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