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Micro-Drill #67 — Add edge (undirected)

Graph Exploration Target: 5s

Undirected edges add both directions. Foundation for graph construction.

graph[u].append(v)
graph[v].append(u)

Type it from memory. Go.

Practice Problems

• 133. Clone Graph
• 547. Number of Provinces

Related Coding Drills

• Drill #44 — Detect cycle in undirected graph Medium