30 lines
926 B
Markdown
30 lines
926 B
Markdown
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`
|
|
|
|
https://leetcode.com/problems/max-number-of-k-sum-pairs |