Compilare: user.cpp: In function ‘void df(int)’: user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void rezolva(int)’: user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result