g2201_2300.s2240_number_of_ways_to_buy_pens_and_pencils

Class Solution

java.lang.Object

g2201_2300.s2240_number_of_ways_to_buy_pens_and_pencils.Solution

public class Solution
extends Object

2240 - Number of Ways to Buy Pens and Pencils.

Medium

You are given an integer total indicating the amount of money you have. You are also given two integers cost1 and cost2 indicating the price of a pen and pencil respectively. You can spend part or all of your money to buy multiple quantities (or none) of each kind of writing utensil.

Return the number of distinct ways you can buy some number of pens and pencils.

Example 1:

Input: total = 20, cost1 = 10, cost2 = 5

Output: 9

Explanation: The price of a pen is 10 and the price of a pencil is 5.

• If you buy 0 pens, you can buy 0, 1, 2, 3, or 4 pencils.

• If you buy 1 pen, you can buy 0, 1, or 2 pencils.

• If you buy 2 pens, you cannot buy any pencils.

The total number of ways to buy pens and pencils is 5 + 3 + 1 = 9.

Example 2:

Input: total = 5, cost1 = 10, cost2 = 10

Output: 1

Explanation: The price of both pens and pencils are 10, which cost more than total, so you cannot buy any writing utensils. Therefore, there is only 1 way: buy 0 pens and 0 pencils.

Constraints:

• 1 <= total, cost1, cost2 <= 106

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
long	waysToBuyPensPencils(int totalMoney, int costPen, int costPencil)

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

waysToBuyPensPencils

public long waysToBuyPensPencils(int totalMoney,
                                 int costPen,
                                 int costPencil)