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-rw-r--r--other/max_num_ksum_pair.cpp22
1 files changed, 22 insertions, 0 deletions
diff --git a/other/max_num_ksum_pair.cpp b/other/max_num_ksum_pair.cpp
new file mode 100644
index 0000000..13c6980
--- /dev/null
+++ b/other/max_num_ksum_pair.cpp
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+#include "leetcode.h"
+
+class Solution {
+public:
+ int maxOperations(vector<int> &nums, int k) {
+ unordered_map<int, int> freq;
+ int ans = 0;
+ for (int i = 0; i < nums.size(); i++)
+ if (freq[k - nums[i]] > 0) {
+ ans++;
+ freq[k - nums[i]]--;
+ } else
+ freq[nums[i]]++;
+ return ans;
+ }
+};
+
+int main() {
+ vector<int> nums = {1, 2, 3, 4};
+ Solution obj;
+ cout << obj.maxOperations(nums, 5);
+}