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    <p>If this is what you need (numbers increase columnwise but rows need to be filled first):</p> <pre><code>for 16: 0 6 11 1 7 12 2 8 13 3 9 14 4 10 15 5 for 17: 0 6 12 1 7 13 2 8 14 3 9 15 4 10 16 5 11 </code></pre> <p>You need to define which column is getting the remainders:</p> <pre><code>int remainder = total % 3; </code></pre> <p>if remainder is 1, only first column is 6 elements. if remainder is 2, first &amp; second columns are 6 elements. You need to calculate startIndex and endIndex according to this.</p> <p>So;</p> <pre><code>int pageSize = total / 3; int remainder = total % 3; int startIndex = column * pageSize + min(column, remainder); int endIndex = startIndex + pageSize + (remainder &gt; column ? 1 : 0); </code></pre> <p>should work. I just tested it, it works for different rowsizes than 3.</p> <p>Here is how I got the formulas, drawing tables is good practice for sorting out such algortihms:</p> <p>r:Remainder, c:column, ps:pagesize (as calculated above)</p> <pre><code>StartingIndex: . |r:0 |r:1 |r:2 ---------------------- c:0|0 |0 |0 ---------------------- c:1|ps |ps+1 |ps+1 ---------------------- c:2|ps*2|ps*2+1|ps*2+2 </code></pre> <p>You can see a pattern if you extend the table for rowsize 4:</p> <pre><code>StartingIndex: . |r:0 |r:1 |r:2 |r:3 ------------------------------ c:0|0 |0 |0 |0 ------------------------------ c:1|ps |ps+1 |ps+1 |ps+1 ------------------------------ c:2|ps*2|ps*2+1|ps*2+2|ps*2+2 ------------------------------ c:3|ps*3|ps*3+1|ps*3+2|ps*3+3 </code></pre> <p>the value you are adding is the minimum of the related column and remainder</p> <p>Similarly for the endIndex, desired columns length can be seen when you build a table for given remainder vs column. I won't write that for now because it is taking too much time to draw the tables here and I believe you already got the idea.</p>
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    1. COYes, it exactly what I need, but how to implement in in the function to return correct range for columns 1 and 2?
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    2. COI updated my answer, adding some more explanation.
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    3. COThanks, but startIndex and endIndex are wrong for different columns :(
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