If you're outputting C or C++ codes, then the followings might help:

1. Each line in your program can't be too long. (I chose to add a line break every 950 characters.) Having lines with length exceeding the compiler's limit will make you WA on test 1.

2. Lengths of any string constant (or array?) should be shorter (no longer?) than 65536 bytes. This is yet another unreasonable compiler limitation. Going over the length limit will make you WA on test 3.