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PONeed to find correct 28 triples
 

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  1. PONeed to find correct 28 triples
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    <p>Hi guys I found interesting question from InterviewSteet site.. I'm little bit confused with question. Help me with understanding question please. I'm getting 35 triples but only 28 is expected from sample. I added my 35triples output. please help me to find 28 triples. wat is my mistake in understanding question. i</p> <p>Question:</p> <blockquote> <p>There is an integer array d which does not contain more than two elements of the same value. How many distinct ascending triples (d[i] &lt; d[j] &lt; d[k], i &lt; j &lt; k) are present?</p> </blockquote> <p>Input format</p> <blockquote> <p>The first line contains an integer N denoting the number of elements in the array. This is followed by a single line containing N integers separated by a single space with no leading/trailing spaces</p> </blockquote> <p>Output format:</p> <blockquote> <p>A single integer that denotes the number of distinct ascending triples present in the array</p> </blockquote> <p>Constraints:</p> <pre><code>N &lt;= 10^5 Every element of the array is present at most twice Every element of the array is a 32-bit positive integer </code></pre> <p>Sample input:</p> <pre><code>6 1 1 2 2 3 4 </code></pre> <p>Sample output:</p> <pre><code> 4 </code></pre> <p>Explanation: The distinct triplets are</p> <pre><code>(1,2,3) (1,2,4) (1,3,4) (2,3,4) </code></pre> <p>my input:</p> <pre><code>10 1 1 5 4 3 6 6 5 9 10 </code></pre> <p>my output:</p> <pre><code>35 </code></pre> <p>Explanation: The distinct triplets are</p> <pre><code>(1,3,4) </code></pre> <p>(1,3,5) (1,3,6) (1,3,9) (1,3,10) (1,4,5) (1,4,6) (1,4,9) (1,4,10) (1,5,6) (1,5,9) (1,5,10) (1,6,9) (1,6,10) (1,9,10) (3,4,5) (3,4,6) (3,4,9) (3,4,10) (3,5,6) (3,5,9) (3,5,10) (3,6,9) (3,6,10) (3,9,10) (4,5,6) (4,5,9) (4,5,10) (4,6,9) (4,6,10) (4,9,10) (5,6,9) (5,6,10) (5,9,10) (6,9,10)</p> <p>Expected output:</p> <pre><code>28 </code></pre> <p>I'm getting <code>35 triples</code> but <code>28</code> is correct answer. wat is my mistake??</p>
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    1. USMuthuramu Periyaiah
    1. USMuthuramu Periyaiah
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    1. COIn your list, (5, 4, 3) is obviously not correct for example. And a few others. And you are missing a few, like (1, 3, 5) for example. As to *"wat is my mistake??"* I can only say that your algorithm (which you have not shown) is wrong...
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    2. CO(1,5,4) (1,5,3) are definitely not ascending triples
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    3. CO(1,5,4) (1,5,3) (5,4,3) (5,4,6) (5,4,9) (5,4,10) (5,3,6) (5,3,9) (5,3,10) (4,3,6) (4,3,9) wrong triples. check your logic.
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