2316. Count Unreachable Pairs of Nodes in an Undirected Graph

Medium

571

17

You are given an integer `n`

. There is an **undirected** graph with `n`

nodes, numbered from `0`

to `n - 1`

. You are given a 2D integer array `edges`

where `edges[i] = [a`

denotes that there exists an _{i}, b_{i}]**undirected** edge connecting nodes `a`

and _{i}`b`

._{i}

Return *the number of pairs of different nodes that are unreachable from each other*.

**Example 1:**

Input:n = 3, edges = [[0,1],[0,2],[1,2]]Output:0Explanation:There are no pairs of nodes that are unreachable from each other. Therefore, we return 0.

**Example 2:**

Input:n = 7, edges = [[0,2],[0,5],[2,4],[1,6],[5,4]]Output:14Explanation:There are 14 pairs of nodes that are unreachable from each other: [[0,1],[0,3],[0,6],[1,2],[1,3],[1,4],[1,5],[2,3],[2,6],[3,4],[3,5],[3,6],[4,6],[5,6]]. Therefore, we return 14.

**Constraints:**

`1 <= n <= 10`

^{5}`0 <= edges.length <= 2 * 10`

^{5}`edges[i].length == 2`

`0 <= a`

_{i}, b_{i}< n`a`

_{i}!= b_{i}- There are no repeated edges.

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