I got crass on test #5 for serval times.

finally I change the limit about given words (<= 100000),  digits length (<=200) and length of word (<=100).

then I got AC.

I got AC, with default sizes of arrays. Maybe you don't add +1 to sizes of char arrays( for '\0' char).

test, wich broken my solution :)
2222222222222222222222222222222222222222222222222
5
a
your
reality
real
our
4294967296
5
it
your
reality
real
our
-1