#2349
Design a Number Container System
medium · 57.1% accepted · 966 likes · top 52%
hash table · design · heap (priority queue) · ordered set
Description
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]
Example 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.
Solution