Package g1701_1800.s1711_count_good_meals

Class Solution

java.lang.Object
g1701_1800.s1711_count_good_meals.Solution
public class Solution extends Object
1711 - Count Good Meals.

Medium

A good meal is a meal that contains exactly two different food items with a sum of deliciousness equal to a power of two.

You can pick any two different foods to make a good meal.

Given an array of integers deliciousness where deliciousness[i] is the deliciousness of the ith item of food, return the number of different good meals you can make from this list modulo 109 + 7.

Note that items with different indices are considered different even if they have the same deliciousness value.

Example 1:

Input: deliciousness = [1,3,5,7,9]

Output: 4

Explanation: The good meals are (1,3), (1,7), (3,5) and, (7,9). Their respective sums are 4, 8, 8, and 16, all of which are powers of 2.

Example 2:

Input: deliciousness = [1,1,1,3,3,3,7]

Output: 15

Explanation: The good meals are (1,1) with 3 ways, (1,3) with 9 ways, and (1,7) with 3 ways.

Constraints:

  • 1 <= deliciousness.length <= 105
  • 0 <= deliciousness[i] <= 220

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • countPairs

      public int countPairs(int[] d)