# 825. Friends Of Appropriate Ages LeetCode Solution | Easy Approach Share:

Friends Of Appropriate Ages There are `n` persons on a social media website. You are given an integer array `ages` where `ages[i]` is the age of the `ith` person.

A Person `x` will not send a friend request to a person `y` (`x != y`) if any of the following conditions is true:

• `age[y] <= 0.5 * age[x] + 7`
• `age[y] > age[x]`
• `age[y] > 100 && age[x] < 100`

Otherwise, `x` will send a friend request to `y`.

Note that if `x` sends a request to `y``y` will not necessarily send a request to `x`. Also, a person will not send a friend request to themself.

Return the total number of friend requests made.

Example 1:

```Input: ages = [16,16]
Output: 2
Explanation: 2 people friend request each other.
```

Example 2:

```Input: ages = [16,17,18]
Output: 2
Explanation: Friend requests are made 17 -> 16, 18 -> 17.
```

Example 3:

```Input: ages = [20,30,100,110,120]
Output: 3
Explanation: Friend requests are made 110 -> 100, 120 -> 110, 120 -> 100.
```

Constraints:

• `n == ages.length`
• `1 <= n <= 2 * 104`
• `1 <= ages[i] <= 120`

Time: O(n)
Space: O(n)

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