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Grokking the Coding Interview Patterns in C++

Solution: Redundant Connection

Explore how to solve the redundant connection problem in an undirected graph using the union find data structure. Understand the step-by-step implementation of union by rank and path compression techniques to detect cycles efficiently. This lesson helps you identify the edge causing a cycle and remove it to convert the graph into a tree, improving your skills in graph algorithms and coding interview pattern recognition.

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Statement

We’re given an undirected graph consisting of nn nodes. The graph is represented as an array called edges, of length nn, where edges[i] = [a, b] indicates that there is an edge between nodes a and b in the graph.

Return an edge that can be removed to make the graph a treeA tree is an undirected graph that is connected and has no cycles. of nn nodes. If there are multiple candidates for removal, return the edge that occurs last in edges.

Constraints:

  • 3≤3 \leq nn ≤100\leq 100
  • edges.length
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