Compilare: user.cpp: In function ‘void write()’: user.cpp:116:9: warning: unused variable ‘q’ [-Wunused-variable] int q = Inf; ^ user.cpp: In function ‘void read()’: user.cpp:83:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:86:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &z); ^