Borderou de evaluare (job #496237)

Compilare: user.cpp: In member function 'char input_parser::next()': user.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function 'int main()': user.cpp:99:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:81:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp: In member function 'char input_parser::next()': user.cpp:40:65: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]