Some people will make friend requests. Thelist of their ages is given andages[i]is the age of theith person.
Person A will NOT friend request person B (B != A) if any of the following conditions are true:
- age[B]<= 0.5 * age[A]+ 7
- age[B]> age[A]
- age[B]> 100 &&age[A]< 100
Otherwise, A will friend request B.
Note that ifA requests B, B does not necessarily request A. Also, people will not friend request themselves.
How many total friend requests are made?
Input: [16,16] Output: 2 Explanation: 2 people friend request each other.
Input: [16,17,18] Output: 2 Explanation: Friend requests are made 17 -> 16, 18 -> 17.
Input: [20,30,100,110,120] Output: Explanation: Friend requests are made 110 -> 100, 120 -> 110, 120 -> 100.
- 1 <= ages.length<= 20000.
- 1 <= ages[i] <= 120.
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