Package g2301_2400.s2327_number_of_people_aware_of_a_secret

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    2327 - Number of People Aware of a Secret\.

    Medium

    On day 1, one person discovers a secret.

    You are given an integer delay, which means that each person will share the secret with a new person every day , starting from delay days after discovering the secret. You are also given an integer forget, which means that each person will forget the secret forget days after discovering it. A person cannot share the secret on the same day they forgot it, or on any day afterwards.

    Given an integer n, return the number of people who know the secret at the end of day n. Since the answer may be very large, return it modulo <code>10<sup>9</sup> + 7</code>.

    Example 1:

    Input: n = 6, delay = 2, forget = 4

    Output: 5

    Explanation:

    Day 1: Suppose the first person is named A. (1 person)

    Day 2: A is the only person who knows the secret. (1 person)

    Day 3: A shares the secret with a new person, B. (2 people)

    Day 4: A shares the secret with a new person, C. (3 people)

    Day 5: A forgets the secret, and B shares the secret with a new person, D. (3 people)

    Day 6: B shares the secret with E, and C shares the secret with F. (5 people)

    Example 2:

    Input: n = 4, delay = 1, forget = 3

    Output: 6

    Explanation:

    Day 1: The first person is named A. (1 person)

    Day 2: A shares the secret with B. (2 people)

    Day 3: A and B share the secret with 2 new people, C and D. (4 people)

    Day 4: A forgets the secret. B, C, and D share the secret with 3 new people. (6 people)

    Constraints:

    • 2 &lt;= n &lt;= 1000

    • 1 &lt;= delay &lt; forget &lt;= n

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer peopleAwareOfSecret(Integer n, Integer delay, Integer forget)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait