Compilare: user.cpp: In function ‘void read()’: user.cpp:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void get_apm()’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dfs(int)’: user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void write()’: user.cpp:92: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long int’