Dsa Graph Dfs

In this tutorial, you'll learn about How to Fix DFS Graph Errors. We cover key concepts, practical examples, and best practices.

Fix dfs graph errors when recursion depth causes stack overflow or visited tracking fails.

Quick Fix

Wrong

def dfs(g,s):
    if s in visited: return
    print(s)
    for n in g[s]: dfs(g,n)

No visited set passed as argument. Global state issue.

Right

def dfs(g,s,vis=None):
    if vis is None: vis=set()
    if s in vis: return
    vis.add(s); print(s)
    for n in g[s]: dfs(g,n,vis)

Graph {0:[1,2],1:[2],2:[0,3],3:[3]}, DFS from 0 -> 0,1,2,3. O(V+E).

Prevention

Always track visited nodes. Pass visited as parameter or use closure. Use iterative stack for deep graphs.

DodaTech Tools

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