Create minimum-operations-to-collect-elements.cpp

Author: kamyu104

C++/minimum-operations-to-collect-elements.cpp

@@ -0,0 +1,21 @@
+// Time:  O(n)
+// Space: O(k)
+
+// hash table
+class Solution {
+public:
+    int minOperations(vector<int>& nums, int k) {
+        vector<bool> lookup(k);
+        int i = size(nums) - 1;
+        for (; i >= 0; --i) {
+            if (nums[i] > size(lookup) || lookup[nums[i] - 1]) {
+                continue;
+            }
+            lookup[nums[i] - 1] = true;
+            if (!--k) {
+                break;
+            }
+        }
+        return size(nums) - i;
+    }
+};