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MaxNumberOfKSumPairs.java
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MaxNumberOfKSumPairs.java
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/*https://leetcode.com/problems/max-number-of-k-sum-pairs/*/
class Solution {
public int maxOperations(int[] nums, int k) {
HashMap<Integer,Integer> map = new HashMap<Integer,Integer>();
for (int num : nums)
map.put(num,map.getOrDefault(num,0)+1);
// System.out.println(map);
int pairsCount = 0;
for (Map.Entry elem : map.entrySet())
{
int key = (Integer)elem.getKey();
int value = (Integer)elem.getValue();
pairsCount += Math.min(value,map.getOrDefault(k-key,0));
}
return pairsCount/2;
}
}
class Solution {
public int maxOperations(int[] nums, int k)
{
Arrays.sort(nums);
int p1 = 0, p2 = nums.length - 1;
int count = 0;
while(p1 < p2)
{
int sum = nums[p1] + nums[p2];
if(sum == k)
{
++count; ++p1; --p2;
}
else if(sum > k)
--p2;
else
++p1;
}
return count;
}
}