g1601_1700.s1679_max_number_of_k_sum_pairs

Class Solution

java.lang.Object

g1601_1700.s1679_max_number_of_k_sum_pairs.Solution

public class Solution
extends Object

1679 - Max Number of K-Sum Pairs.

Medium

You are given an integer array nums and an integer k.

In one operation, you can pick two numbers from the array whose sum equals k and remove them from the array.

Return the maximum number of operations you can perform on the array.

Example 1:

Input: nums = [1,2,3,4], k = 5

Output: 2

Explanation: Starting with nums = [1,2,3,4]:

• Remove numbers 1 and 4, then nums = [2,3]

• Remove numbers 2 and 3, then nums = []

There are no more pairs that sum up to 5, hence a total of 2 operations.

Example 2:

Input: nums = [3,1,3,4,3], k = 6

Output: 1

Explanation: Starting with nums = [3,1,3,4,3]:

• Remove the first two 3’s, then nums = [1,4,3]

There are no more pairs that sum up to 6, hence a total of 1 operation.

Constraints:

• 1 <= nums.length <= 105
• 1 <= nums[i] <= 109
• 1 <= k <= 109

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	maxOperations(int[] nums, int k)

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

maxOperations

public int maxOperations(int[] nums,
                         int k)