Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Iterative algorithm.</p> <pre><code>public class A { public static List&lt;List&lt;Integer&gt;&gt; combinations(List&lt;List&lt;Integer&gt;&gt; inputList) { List&lt;List&lt;Integer&gt;&gt; result = new LinkedList&lt;List&lt;Integer&gt;&gt;(); for (Integer i : inputList.get(0)) { List&lt;Integer&gt; temp = new ArrayList&lt;Integer&gt;(1); temp.add(i); result.add(temp); } for (int i = 1; i &lt; inputList.size(); i++) { result = make(result, inputList.get(i)); } return result; } private static List&lt;List&lt;Integer&gt;&gt; make(List&lt;List&lt;Integer&gt;&gt; in, List&lt;Integer&gt; n) { List&lt;List&lt;Integer&gt;&gt; res = new LinkedList&lt;List&lt;Integer&gt;&gt;(); for (List&lt;Integer&gt; l : in) { for (Integer i : n) { List&lt;Integer&gt; cur = new ArrayList&lt;Integer&gt;(l.size() + 1); cur.addAll(l); cur.add(i); res.add(cur); } } return res; } public static void main(String[] args) { List&lt;List&lt;Integer&gt;&gt; inputList = new ArrayList(); inputList.add(new ArrayList&lt;Integer&gt;() {{ add(1); add(2); }}); inputList.add(new ArrayList&lt;Integer&gt;() {{ add(10); add(20); add(30); }}); inputList.add(new ArrayList&lt;Integer&gt;() {{ add(100); }}); System.out.println(combinations(inputList)); } } </code></pre> <p>*Notice that this code <strong>not for production!</strong> You should replace <code>LinkedList</code> with <code>ArrayList</code> with initial size, make checks and so on.</p> <p><strong>upd</strong> usage example provided. there is some code improvement. But it still only draft. I wouldn't recommend you use it in real tasks.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow to get a list of all lists containing exactly one element of each list of a list of lists
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USStan Kurilin
    1. USStan Kurilin
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO+1 for iterative algorithm
      singulars
      1. PO
      1. USNathan
    2. COThanks, i will upvote this too.
      singulars
      1. PO
      1. USDunaril
    3. COand @Dunaril,can we have a `java main method` demonstrating the example so that we can test it for further reference,Appreciated if it could be posted.
      singulars
      1. PO
      1. USDeepak
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload