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46 lines
2.2 KiB
HTML
46 lines
2.2 KiB
HTML
<p>Write an API that generates fancy sequences using the <code>append</code>, <code>addAll</code>, and <code>multAll</code> operations.</p>
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<p>Implement the <code>Fancy</code> class:</p>
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<ul>
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<li><code>Fancy()</code> Initializes the object with an empty sequence.</li>
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<li><code>void append(val)</code> Appends an integer <code>val</code> to the end of the sequence.</li>
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<li><code>void addAll(inc)</code> Increments all existing values in the sequence by an integer <code>inc</code>.</li>
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<li><code>void multAll(m)</code> Multiplies all existing values in the sequence by an integer <code>m</code>.</li>
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<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>
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</ul>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input</strong>
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["Fancy", "append", "addAll", "append", "multAll", "getIndex", "addAll", "append", "multAll", "getIndex", "getIndex", "getIndex"]
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[[], [2], [3], [7], [2], [0], [3], [10], [2], [0], [1], [2]]
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<strong>Output</strong>
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[null, null, null, null, null, 10, null, null, null, 26, 34, 20]
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<strong>Explanation</strong>
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Fancy fancy = new Fancy();
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fancy.append(2); // fancy sequence: [2]
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fancy.addAll(3); // fancy sequence: [2+3] -> [5]
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fancy.append(7); // fancy sequence: [5, 7]
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fancy.multAll(2); // fancy sequence: [5*2, 7*2] -> [10, 14]
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fancy.getIndex(0); // return 10
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fancy.addAll(3); // fancy sequence: [10+3, 14+3] -> [13, 17]
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fancy.append(10); // fancy sequence: [13, 17, 10]
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fancy.multAll(2); // fancy sequence: [13*2, 17*2, 10*2] -> [26, 34, 20]
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fancy.getIndex(0); // return 26
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fancy.getIndex(1); // return 34
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fancy.getIndex(2); // return 20
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= val, inc, m <= 100</code></li>
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<li><code>0 <= idx <= 10<sup>5</sup></code></li>
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<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>
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</ul>
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