Dear sir/madam,
Could you, please, point out what compilers do you use?
It's very important.
On problem 1054 I received compilation error on the first
attempt (#32413), although my VC++6.0 compiler did not find
any mistakes.
the problem was the following:
--- error ---
    for (long i = 0; i < n; i++) cin >> d[i];
    for (i = 1; i < 31; i++) st2[i] = 2*st2[i-1]; <<
here you said "temp\32413(28) : error C2065: 'i' :
undeclared identifier"
--- I corrected it -------
    long i;
    for (i = 0; i < n; i++) cin >> d[i];
    for (i = 1; i < 31; i++) st2[i] = 2*st2[i-1];
--------------------------
In second case I received Accepted :(.
I suppose, the first case was correct too if we say about
C++.
Please, give some explanations.

Thank you in advance, Matvey Kazakov
(kazakov@green.ifmo.ru).

There is an option in cl.exe (though i don't remember it
exactly, that disables microsoft extensions and leaves only
ANSI C++ limitations. I am not familiar with ANSI C++
standard. But you can look. )