Dsa Graph Clone

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

Fix clone graph errors when deep copy shares references or recursion doesn't handle cycles.

Quick Fix

Wrong

def clone(n):
    if not n: return None
    cp=Node(n.val)
    for nb in n.neighbors: cp.neighbors.append(clone(nb))
    return cp

No visited tracking. Infinite recursion on cyclic graph.

Right

def clone(n, memo=None):
    if not n: return None
    if memo is None: memo={}
    if n in memo: return memo[n]
    cp=Node(n.val)
    memo[n]=cp
    for nb in n.neighbors:
        cp.neighbors.append(clone(nb,memo))
    return cp

Original cyclc graph cloned correctly. Each node appears once. O(V+E).

Prevention

Use memoization dictionary to track already-cloned nodes. Return cached clone when revisiting.

DodaTech Tools

Doda Browser's algorithm visualizer steps through DSA operations line by line. DodaZIP archives implementation patterns for team sharing. Durga Antivirus Pro detects memory corruption patterns in algorithm implementations.

FAQ