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- class Solution {
- public:
- int maxOperations(vector<int>& nums, int k) {
- unordered_map<int,int> m;
- int c=0;
- for(int i=0;i<nums.size();i++)
- {
- if(m[nums[i]]>0)
- {
- c++;
- m[nums[i]]--;
- }
- else
- {
- m[k-nums[i]]++;
- }
- }
- return c;
- }
- };
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