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Postsdbo
PO
 

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  1. PO
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    <p>How about this?</p> <pre><code>var arr = new [] {5, 1, -7, 3, 7}; var xs = from n in Enumerable.Range(0, arr.Length) from l in Enumerable.Range(1, arr.Length - n) let subseq = arr.Skip(n).Take(l) orderby subseq.Count() descending orderby subseq.Sum() descending select subseq; var maxSumSubseq = xs.First(); </code></pre> <p>EDIT: Added <code>orderby subseq.Count() descending</code> to get maximal length subsequence.</p> <hr> <p>EDIT: Added explanation as per comment.</p> <ol> <li><p>Select all possible subsequence starting indices:</p> <pre><code>from n in Enumerable.Range(0, arr.Length) </code></pre></li> <li><p>Select all possible lengths of subsequences given the starting index:</p> <pre><code>from l in Enumerable.Range(1, arr.Length - n) </code></pre></li> <li><p>Extract the subsequence from the array:</p> <pre><code>let subseq = arr.Skip(n).Take(l) </code></pre></li> <li><p>Order subsequences by descending length (i.e. longest first) - could order by <code>l</code> instead of <code>subseq.Count()</code> but the latter is more expressive even though the former is more efficient:</p> <pre><code>orderby subseq.Count() descending </code></pre></li> <li><p>Calculate the sum of each subsequence and order the subsequences so highest valued sums are first:</p> <pre><code>orderby subseq.Sum() descending </code></pre></li> <li><p>Select the subsequences:</p> <pre><code>select subseq; </code></pre></li> <li><p>Only select the first subsequence - it's the highest value sum with the greatest length:</p> <pre><code>xs.First(); </code></pre></li> </ol> <p>Hope this helps.</p>
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    1. POGiven an array of integers. Find the LARGEST subarray with the MAXIMUM sum
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    1. COcan't guarantee that this result will give you the right answer for `var arr = new [] {5,1,-7,2,2,2}`
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      1. USBob Vale
    2. CO+1 For all the variations I've tried, it returned the correct result but you might want to explain one another. I have no idea how this works.
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      1. USLieven Keersmaekers
    3. CO@Lieven - I added an explanation of each line. Let me know if this helps or not. Cheers.
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