Compilare: user.cpp: In function ‘void pre()’: user.cpp:47:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos + 1 < aux.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:62:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("game4.in","r",stdin); ^ user.cpp:63:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("game4.out","w",stdout); ^