Package g1601_1700.s1622_fancy_sequence

Class Fancy

java.lang.Object
g1601_1700.s1622_fancy_sequence.Fancy
public class Fancy extends Object
1622 - Fancy Sequence.<p>Hard</p> <p>Write an API that generates fancy sequences using the <code>append</code>, <code>addAll</code>, and <code>multAll</code> operations.</p> <p>Implement the <code>Fancy</code> class:</p> <ul> <li><code>Fancy()</code> Initializes the object with an empty sequence.</li> <li><code>void append(val)</code> Appends an integer <code>val</code> to the end of the sequence.</li> <li><code>void addAll(inc)</code> Increments all existing values in the sequence by an integer <code>inc</code>.</li> <li><code>void multAll(m)</code> Multiplies all existing values in the sequence by an integer <code>m</code>.</li> <li><code>int getIndex(idx)</code> Gets the current value at index <code>idx</code> (0-indexed) of the sequence <strong>modulo</strong> <code>10<sup>9</sup> + 7</code>. If the index is greater or equal than the length of the sequence, return <code>-1</code>.</li> </ul> <p><strong>Example 1:</strong></p> <p><strong>Input</strong> [&ldquo;Fancy&rdquo;, &ldquo;append&rdquo;, &ldquo;addAll&rdquo;, &ldquo;append&rdquo;, &ldquo;multAll&rdquo;, &ldquo;getIndex&rdquo;, &ldquo;addAll&rdquo;, &ldquo;append&rdquo;, &ldquo;multAll&rdquo;, &ldquo;getIndex&rdquo;, &ldquo;getIndex&rdquo;, &ldquo;getIndex&rdquo;] [ [], [2], [3], [7], [2], [0], [3], [10], [2], [0], [1], [2]]</p> <p><strong>Output:</strong> [null, null, null, null, null, 10, null, null, null, 26, 34, 20]</p> <p><strong>Explanation:</strong></p> <p>Fancy fancy = new Fancy();</p> <p>fancy.append(2); // fancy sequence: [2]</p> <p>fancy.addAll(3); // fancy sequence: [2+3] -> [5]</p> <p>fancy.append(7); // fancy sequence: [5, 7]</p> <p>fancy.multAll(2); // fancy sequence: [5*2, 7*2] -> [10, 14]</p> <p>fancy.getIndex(0); // return 10</p> <p>fancy.addAll(3); // fancy sequence: [10+3, 14+3] -> [13, 17]</p> <p>fancy.append(10); // fancy sequence: [13, 17, 10]</p> <p>fancy.multAll(2); // fancy sequence: [13*2, 17*2, 10*2] -> [26, 34, 20]</p> <p>fancy.getIndex(0); // return 26</p> <p>fancy.getIndex(1); // return 34</p> <p>fancy.getIndex(2); // return 20</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= val, inc, m <= 100</code></li> <li><code>0 <= idx <= 10<sup>5</sup></code></li> <li>At most <code>10<sup>5</sup></code> calls total will be made to <code>append</code>, <code>addAll</code>, <code>multAll</code>, and <code>getIndex</code>.</li> </ul>

  • Constructor Details

    • Fancy

      public Fancy()

  • Method Details

    • append

      public void append(int val)

    • addAll

      public void addAll(int inc)

    • multAll

      public void multAll(int m)

    • getIndex

      public int getIndex(int idx)