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.<p>Medium</p> <p>Design a number container system that can do the following:</p> <ul> <li><strong>Insert</strong> or <strong>Replace</strong> a number at the given index in the system.</li> <li><strong>Return</strong> the smallest index for the given number in the system.</li> </ul> <p>Implement the <code>NumberContainers</code> class:</p> <ul> <li><code>NumberContainers()</code> Initializes the number container system.</li> <li><code>void change(int index, int number)</code> Fills the container at <code>index</code> with the <code>number</code>. If there is already a number at that <code>index</code>, replace it.</li> <li><code>int find(int number)</code> Returns the smallest index for the given <code>number</code>, or <code>-1</code> if there is no index that is filled by <code>number</code> in the system.</li> </ul> <p><strong>Example 1:</strong></p> <p><strong>Input</strong></p> <p>[&ldquo;NumberContainers&rdquo;, &ldquo;find&rdquo;, &ldquo;change&rdquo;, &ldquo;change&rdquo;, &ldquo;change&rdquo;, &ldquo;change&rdquo;, &ldquo;find&rdquo;, &ldquo;change&rdquo;, &ldquo;find&rdquo;]</p> <p>[ [], [10], [2, 10], [1, 10], [3, 10], [5, 10], [10], [1, 20], [10]]</p> <p><strong>Output:</strong> [null, -1, null, null, null, null, 1, null, 2]</p> <p><strong>Explanation:</strong></p> <pre><code> 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. </code></pre> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= index, number <= 10<sup>9</sup></code></li> <li>At most <code>10<sup>5</sup></code> calls will be made <strong>in total</strong> to <code>change</code> and <code>find</code>.</li> </ul>

  • Constructor Details

    • NumberContainers

      public NumberContainers()

  • Method Details

    • change

      public void change(int index, int number)

    • find

      public int find(int number)