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g0801_0900.s0834_sum_of_distances_in_tree.readme.md Maven / Gradle / Ivy

834\. Sum of Distances in Tree

Hard

There is an undirected connected tree with `n` nodes labeled from `0` to `n - 1` and `n - 1` edges.

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

Return an array `answer` of length `n` where `answer[i]` is the sum of the distances between the ith node in the tree and all other nodes.

**Example 1:**

![](https://assets.leetcode.com/uploads/2021/07/23/lc-sumdist1.jpg)

**Input:** n = 6, edges = [[0,1],[0,2],[2,3],[2,4],[2,5]]

**Output:** [8,12,6,10,10,10]

**Explanation:** The tree is shown above. 

We can see that dist(0,1) + dist(0,2) + dist(0,3) + dist(0,4) + dist(0,5) equals 1 + 1 + 2 + 2 + 2 = 8. 

Hence, answer[0] = 8, and so on.

**Example 2:**

![](https://assets.leetcode.com/uploads/2021/07/23/lc-sumdist2.jpg)

**Input:** n = 1, edges = []

**Output:** [0]

**Example 3:**

![](https://assets.leetcode.com/uploads/2021/07/23/lc-sumdist3.jpg)

**Input:** n = 2, edges = [[1,0]]

**Output:** [1,1]

**Constraints:**

*   1 <= n <= 3 * 104
*   `edges.length == n - 1`
*   `edges[i].length == 2`
*   0 <= ai, bi < n
*   ai != bi
*   The given input represents a valid tree.