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38 lines
1.8 KiB
HTML
38 lines
1.8 KiB
HTML
<p>For a stream of integers, implement a data structure that checks if the last <code>k</code> integers parsed in the stream are <strong>equal</strong> to <code>value</code>.</p>
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<p>Implement the <strong>DataStream</strong> class:</p>
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<ul>
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<li><code>DataStream(int value, int k)</code> Initializes the object with an empty integer stream and the two integers <code>value</code> and <code>k</code>.</li>
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<li><code>boolean consec(int num)</code> Adds <code>num</code> to the stream of integers. Returns <code>true</code> if the last <code>k</code> integers are equal to <code>value</code>, and <code>false</code> otherwise. If there are less than <code>k</code> integers, the condition does not hold true, so returns <code>false</code>.</li>
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</ul>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input</strong>
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["DataStream", "consec", "consec", "consec", "consec"]
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[[4, 3], [4], [4], [4], [3]]
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<strong>Output</strong>
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[null, false, false, true, false]
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<strong>Explanation</strong>
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DataStream dataStream = new DataStream(4, 3); //value = 4, k = 3
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dataStream.consec(4); // Only 1 integer is parsed, so returns False.
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dataStream.consec(4); // Only 2 integers are parsed.
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// Since 2 is less than k, returns False.
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dataStream.consec(4); // The 3 integers parsed are all equal to value, so returns True.
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dataStream.consec(3); // The last k integers parsed in the stream are [4,4,3].
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// Since 3 is not equal to value, it returns False.
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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 <= value, num <= 10<sup>9</sup></code></li>
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<li><code>1 <= k <= 10<sup>5</sup></code></li>
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<li>At most <code>10<sup>5</sup></code> calls will be made to <code>consec</code>.</li>
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</ul>
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