Compilare: user.cpp: In function ‘void df(int)’: user.cpp:46: warning: comparison between signed and unsigned integer expressions user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void rezolva()’: user.cpp:102: warning: too many arguments for format user.cpp: In function ‘int main()’: user.cpp:136: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result