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g2001_2100.s2076_process_restricted_friend_requests.readme.md Maven / Gradle / Ivy

2076\. Process Restricted Friend Requests

Hard

You are given an integer `n` indicating the number of people in a network. Each person is labeled from `0` to `n - 1`.

You are also given a **0-indexed** 2D integer array `restrictions`, where restrictions[i] = [xi, yi] means that person xi and person yi **cannot** become **friends**, either **directly** or **indirectly** through other people.

Initially, no one is friends with each other. You are given a list of friend requests as a **0-indexed** 2D integer array `requests`, where requests[j] = [uj, vj] is a friend request between person uj and person vj.

A friend request is **successful** if uj and vj can be **friends**. Each friend request is processed in the given order (i.e., `requests[j]` occurs before `requests[j + 1]`), and upon a successful request, uj and vj **become direct friends** for all future friend requests.

Return _a **boolean array**_ `result`, _where each_ `result[j]` _is_ `true` _if the_ jth _friend request is **successful** or_ `false` _if it is not_.

**Note:** If uj and vj are already direct friends, the request is still **successful**.

**Example 1:**

**Input:** n = 3, restrictions = [[0,1]], requests = [[0,2],[2,1]]

**Output:** [true,false]

**Explanation:**

Request 0: Person 0 and person 2 can be friends, so they become direct friends.

Request 1: Person 2 and person 1 cannot be friends since person 0 and person 1 would be indirect friends (1--2--0). 

**Example 2:**

**Input:** n = 3, restrictions = [[0,1]], requests = [[1,2],[0,2]]

**Output:** [true,false]

**Explanation:**

Request 0: Person 1 and person 2 can be friends, so they become direct friends.

Request 1: Person 0 and person 2 cannot be friends since person 0 and person 1 would be indirect friends (0--2--1). 

**Example 3:**

**Input:** n = 5, restrictions = [[0,1],[1,2],[2,3]], requests = [[0,4],[1,2],[3,1],[3,4]]

**Output:** [true,false,true,false]

**Explanation:**

Request 0: Person 0 and person 4 can be friends, so they become direct friends.

Request 1: Person 1 and person 2 cannot be friends since they are directly restricted.

Request 2: Person 3 and person 1 can be friends, so they become direct friends.

Request 3: Person 3 and person 4 cannot be friends since person 0 and person 1 would be indirect friends (0--4--3--1). 

**Constraints:**

*   `2 <= n <= 1000`
*   `0 <= restrictions.length <= 1000`
*   `restrictions[i].length == 2`
*   0 <= xi, yi <= n - 1
*   xi != yi
*   `1 <= requests.length <= 1000`
*   `requests[j].length == 2`
*   0 <= uj, vj <= n - 1
*   uj != vj