Create 2071.Maximum-Number-of-Tasks-You-Can-Assign.cpp

Binary_Search/2071.Maximum-Number-of-Tasks-You-Can-Assign/2071.Maximum-Number-of-Tasks-You-Can-Assign.cpp

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+class Solution {
+public:
+    int maxTaskAssign(vector<int>& tasks, vector<int>& workers, int pills, int strength) 
+    {
+        sort(tasks.begin(), tasks.end());
+        sort(workers.begin(), workers.end());
+        int left = 0, right = tasks.size();
+        while (left < right)
+        {
+            int mid = right - (right - left)/2;
+            if (checkOK(tasks, workers, pills, strength, mid))
+                left = mid;
+            else
+                right = mid-1;
+        }
+        return left;        
+    }
+
+    bool checkOK(vector<int>& tasks, vector<int>& workers, int pills, int strength, int num)
+    {
+        if (num > tasks.size()) return false;
+        if (num > workers.size()) return false;
+
+        multiset<int>Set(workers.begin(), workers.end());        
+
+        for (int i=num-1; i>=0; i--)
+        {            
+            if (*Set.rbegin() >= tasks[i])            
+            {
+                Set.erase(prev(Set.end()));
+            }
+            else 
+            {
+                if (pills == 0) return false;
+                auto iter = Set.lower_bound(tasks[i]-strength);
+                if (iter == Set.end()) return false;
+                Set.erase(iter);                
+                pills--;
+            }
+        }
+        return true;
+    }
+};