Package g1801_1900.s1817_finding_the_users_active_minutes

Class Solution

  • public class Solution
extends Object
    1817 - Finding the Users Active Minutes.

    Medium

    You are given the logs for users’ actions on LeetCode, and an integer k. The logs are represented by a 2D integer array logs where each logs[i] = [IDi, timei] indicates that the user with IDi performed an action at the minute timei.

    Multiple users can perform actions simultaneously, and a single user can perform multiple actions in the same minute.

    The user active minutes (UAM) for a given user is defined as the number of unique minutes in which the user performed an action on LeetCode. A minute can only be counted once, even if multiple actions occur during it.

    You are to calculate a 1-indexed array answer of size k such that, for each j (1 <= j <= k), answer[j] is the number of users whose UAM equals j.

    Return the array answer as described above.

    Example 1:

    Input: logs = [[0,5],[1,2],[0,2],[0,5],[1,3]], k = 5

    Output: [0,2,0,0,0]

    Explanation:

    The user with ID=0 performed actions at minutes 5, 2, and 5 again. Hence, they have a UAM of 2 (minute 5 is only counted once).

    The user with ID=1 performed actions at minutes 2 and 3. Hence, they have a UAM of 2.

    Since both users have a UAM of 2, answer[2] is 2, and the remaining answer[j] values are 0.

    Example 2:

    Input: logs = [[1,1],[2,2],[2,3]], k = 4

    Output: [1,1,0,0]

    Explanation:

    The user with ID=1 performed a single action at minute 1. Hence, they have a UAM of 1.

    The user with ID=2 performed actions at minutes 2 and 3. Hence, they have a UAM of 2.

    There is one user with a UAM of 1 and one with a UAM of 2.

    Hence, answer[1] = 1, answer[2] = 1, and the remaining values are 0.

    Constraints:

    • 1 <= logs.length <= 104
    • 0 <= IDi <= 109
    • 1 <= timei <= 105
    • k is in the range [The maximum UAM for a user, 105].

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • findingUsersActiveMinutes

        public int[] findingUsersActiveMinutes​(int[][] logs,
                                       int k)