Package g2301_2400.s2327_number_of_people_aware_of_a_secret

Class Solution

java.lang.Object

g2301_2400.s2327_number_of_people_aware_of_a_secret.Solution

public class Solution
extends Object

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 109 + 7.

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 <= n <= 1000
• 1 <= delay < forget <= n

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

peopleAwareOfSecret

public int peopleAwareOfSecret(int n,
                               int delay,
                               int forget)