Compilare: user.cpp: In function ‘int compare(char*, char*)’: user.cpp:19: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int comparec(std::vector<char*, std::allocator<char*> >, std::vector<char*, std::allocator<char*> >)’: user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:121: warning: NULL used in arithmetic user.cpp:129: warning: deprecated conversion from string constant to ‘char*’ user.cpp:92: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result