Grokking Graph Algorithms for Coding Interviews
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Problem 1: Find if Path Exists in Graph(easy)
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Problem Statement

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Problem Statement

Given an undirected graph, represented as a list of edges. Each edge is illustrated as a pair of integers [u, v], signifying that there's a mutual connection between node u and node v.

You are also given starting node start, and a destination node end, return true if a path exists between the starting node and the destination node. Otherwise, return false.

Examples

Example 1:

  • Input: n = 4, edges = [[0,1],[1,2],[2,3]], start = 0, end = 3
Image
  • Expected Output: true
  • Justification: There's a path from node 0 -> 1 -> 2 -> 3.

Example 2:

  • Input: n = 4, edges = [[0,1],[2,3]], start = 0, end = 3
Image
  • Expected Output: false
  • Justification: Nodes 0 and 3 are not connected, so no path exists between them.

Example 3:

  • Input: n = 5, edges = [[0,1],[3,4]], start = 0, end = 4
Image
  • Expected Output: false
  • Justification: Nodes 0 and 4 are not connected in any manner.

Constraints:

  • 1 <= n <= 2 * 10<sup>5</sup>
  • 0 <= edges.length <= 2 * 10<sup>5</sup>
  • edges[i].length == 2
  • 0 <= u<sub>i</sub>, v<sub>i</sub> <= n - 1
  • u<sub>i</sub> != v<sub>i</sub>
  • 0 <= source, destination <= n - 1
  • There are no duplicate edges.
  • There are no self edges.

Try it yourself

Try solving this question here:

Python3
Python3
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On this page

Problem Statement

Examples

Try it yourself