Compilare: user.cpp: In function ‘int root(int, int, int, int)’: user.cpp:31: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result