Create 621. Task Scheduler (#433)

Author: Chayandas07

621. Task Scheduler

@@ -0,0 +1,19 @@
+class Solution {
+public:
+    int leastInterval(vector<char>& tasks, int n) {
+        int taskFreqMp[26] = {0};
+        for (char c : tasks) {
+            taskFreqMp[c - 'A']++;
+        }
+        
+        sort(taskFreqMp, taskFreqMp + 26);
+        
+        int batchCnt = taskFreqMp[25];
+        int vacantSlots = (--batchCnt) * n;
+        for (int indx = 0; indx < 25; indx++) {
+            vacantSlots -= min(taskFreqMp[indx], batchCnt);
+        }
+        
+        return (vacantSlots > 0) ? tasks.size() + vacantSlots : tasks.size();
+    }
+};