Package g2301_2400.s2349_design_a_number_container_system

Class NumberContainers

java.lang.Object
g2301_2400.s2349_design_a_number_container_system.NumberContainers
public class NumberContainers extends Object
2349 - Design a Number Container System.

Medium

Design a number container system that can do the following:

  • Insert or Replace a number at the given index in the system.
  • Return the smallest index for the given number in the system.

Implement the NumberContainers class:

  • NumberContainers() Initializes the number container system.
  • void change(int index, int number) Fills the container at index with the number. If there is already a number at that index, replace it.
  • int find(int number) Returns the smallest index for the given number, or -1 if there is no index that is filled by number in the system.

Example 1:

Input

[“NumberContainers”, “find”, “change”, “change”, “change”, “change”, “find”, “change”, “find”]

[[], [10], [2, 10], [1, 10], [3, 10], [5, 10], [10], [1, 20], [10]]

Output: [null, -1, null, null, null, null, 1, null, 2]

Explanation:

 NumberContainers nc = new NumberContainers();
 nc.find(10); // There is no index that is filled with number 10. Therefore, we return -1.
 nc.change(2, 10); // Your container at index 2 will be filled with number 10.
 nc.change(1, 10); // Your container at index 1 will be filled with number 10.
 nc.change(3, 10); // Your container at index 3 will be filled with number 10.
 nc.change(5, 10); // Your container at index 5 will be filled with number 10.
 nc.find(10); // Number 10 is at the indices 1, 2, 3, and 5. Since the smallest index that is filled with 10 is 1, we return 1.
 nc.change(1, 20); // Your container at index 1 will be filled with number 20. Note that index 1 was filled with 10 and then replaced with 20.
 nc.find(10); // Number 10 is at the indices 2, 3, and 5. The smallest index that is filled with 10 is 2. Therefore, we return 2.

Constraints:

  • 1 <= index, number <= 109
  • At most 105 calls will be made in total to change and find.

  • Constructor Details

    • NumberContainers

      public NumberContainers()

  • Method Details

    • change

      public void change(int index, int number)

    • find

      public int find(int number)