Create minimum-number-of-increasing-subsequence-to-be-removed.cpp

Author: kamyu104

C++/minimum-number-of-increasing-subsequence-to-be-removed.cpp

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+// Time:  O(nlogn)
+// Space: O(n)
+
+// binary search, longest increasing subsequence, lis
+class Solution {
+public:
+    int minOperations(vector<int>& nums) {
+        const auto& longest_non_increasing_subsequence = [](const auto& arr) {
+            vector<int> result;
+            for (const auto& x : arr) {
+                auto it = upper_bound(begin(result), end(result), -x);
+                if (it == end(result)) {
+                    result.emplace_back(-x);
+                } else {
+                    *it = -x;
+                }
+            }
+            return size(result);
+        };
+
+        return longest_non_increasing_subsequence(nums);
+    }
+};