This my results. For this task, time limit is 1.0 second, so why it happend with 0.265 time?

5520909    12:24:55 21 фев 2014    svg2003    1915. Руины титанов: воссоздание былого    Visual C# 2010    Time limit exceeded    42    0.265    49 708 КБ

Edited by author 21.02.2014 12:30

Edited by author 21.02.2014 12:31

May be 0.265 is time of last succefull test.
Looks like test 42 uses geometric progression - coins double many times. So solution should work with unlimited stacks.