2244. Minimum Rounds to Complete All Tasks
Description
You are given a 0-indexed integer array tasks
, where tasks[i]
represents the difficulty level of a task. In each round, you can complete either 2 or 3 tasks of the same difficulty level.
Return the minimum rounds required to complete all the tasks, or -1
if it is not possible to complete all the tasks.
Example 1:
Input: tasks = [2,2,3,3,2,4,4,4,4,4] Output: 4 Explanation: To complete all the tasks, a possible plan is: - In the first round, you complete 3 tasks of difficulty level 2. - In the second round, you complete 2 tasks of difficulty level 3. - In the third round, you complete 3 tasks of difficulty level 4. - In the fourth round, you complete 2 tasks of difficulty level 4. It can be shown that all the tasks cannot be completed in fewer than 4 rounds, so the answer is 4.
Example 2:
Input: tasks = [2,3,3] Output: -1 Explanation: There is only 1 task of difficulty level 2, but in each round, you can only complete either 2 or 3 tasks of the same difficulty level. Hence, you cannot complete all the tasks, and the answer is -1.
Constraints:
1 <= tasks.length <= 105
1 <= tasks[i] <= 109
Note: This question is the same as 2870: Minimum Number of Operations to Make Array Empty.
Solutions
Solution 1: Hash Table
We use a hash table to count the number of tasks for each difficulty level. Then we traverse the hash table. For each difficulty level, if the number of tasks is $1$, then it is impossible to complete all tasks, so we return $-1$. Otherwise, we calculate the number of rounds needed to complete tasks of this difficulty level and add it to the answer.
Finally, we return the answer.
The time complexity is $O(n)$, and the space complexity is $O(n)$, where $n$ is the length of the tasks
array.
1 2 3 4 5 6 7 8 9 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
|