Pascal ' s Triangle solution

Source: Internet
Author: User


Given numrows, generate the first numrows of Pascal ' s triangle.

For example, given numrows = 5,

[     1], [    1,2,1], [   1,3,3,1], [  1,4,6,4,1]

Key to the solution are to use the arrays, one for current list, and one for previous array.

1  Public classSolution {2      PublicList<list<integer>> Generate (intnumrows) {3list<list<integer>> result =NewArraylist<list<integer>>();4         if(NumRows = = 0)5             returnresult;6List<integer> prev =NewArraylist<integer>();7Prev.add (1);8 Result.add (prev);9          while(NumRows > 1) {TenList<integer> current =NewArraylist<integer>(); One             intLength =prev.size (); ACurrent.add (1); -              for(inti = 0; i < length-1; i++) -Current.add (Prev.get (i) + prev.get (i + 1)); theCurrent.add (1); - Result.add (current); -Prev =Current ; -numrows--; +         } -         returnresult; +     } A}

Pascal ' s Triangle solution

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