2071. Maximum Number of Tasks You Can Assign

2071. Maximum Number of Tasks You Can Assign.cpp

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+class Solution {
+public:
+  bool check(vector<int>& tasks, vector<int>& workers, int pills, int strength, int mid) {
+        int pillsUsed = 0;
+        multiset<int> st(begin(workers), begin(workers) + mid); //best mid workers
+
+        for(int i = mid-1; i >= 0; i--) {
+            int reqrd = tasks[i];
+            auto it   = prev(st.end());
+
+            if(*it >= reqrd) {
+                st.erase(it);
+            } else if(pillsUsed >= pills) {
+                return false;
+            } else {
+                //find the weakest worker which can do this strong task using pills
+                auto weakestWorkerIt = st.lower_bound(reqrd - strength);
+                if(weakestWorkerIt == st.end()) {
+                    return false;
+                }
+                st.erase(weakestWorkerIt);
+                pillsUsed++;
+            }
+        }
+
+        return true;
+    }
+    int maxTaskAssign(vector<int>& tasks, vector<int>& workers, int pills, int strength) {
+        int m = tasks.size();
+        int n = workers.size();
+
+        int l = 0;
+        int r = min(m, n);
+
+        sort(begin(tasks), end(tasks));
+        sort(begin(workers), end(workers), greater<int>());
+
+        int result = 0;
+
+        while(l <= r) {
+            int mid = l + (r-l)/2;
+
+            if(check(tasks, workers, pills, strength, mid)) {
+                result = mid;
+                l = mid+1;
+            } else {
+                r = mid-1;
+            }
+        }
+
+        return result;
+
+
+    }
+};