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Input: Triangle = [ [1], [2,4], [6,4,9], [5,1,7,2] ]
Output: 8
...
           6 [4] 9
          5 [1] 7 2

# PWC 100
use strict;
...
__DATA__
[[1],[2,4],[6,4,9],[5,1,7,2]] 8
[[9],[1,6],[7,8,2],[5,8,2,3]] 19