leetcode/0323_number-of-connected-components-in-an-undirected-graph

You have a graph of n nodes. You are given an integer n and an array edges where edges[i] = [ai, bi] indicates that there is an edge between ai and bi in the graph.

Return the number of connected components in the graph.

Example 1:

Input: n = 5, edges = [[0,1],[1,2],[3,4]] Output: 2 

Example 2:

Input: n = 5, edges = [[0,1],[1,2],[2,3],[3,4]] Output: 1 

Constraints:

• 1 <= n <= 2000
• 1 <= edges.length <= 5000
• edges[i].length == 2
• 0 <= ai <= bi < n
• ai != bi
• There are no repeated edges.

https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/