Compilare: main.cpp: In function 'void read(Map&)': main.cpp:31:7: warning: unused variable 't' [-Wunused-variable] int t, l1, l2, altitude; ^ main.cpp:31:10: warning: unused variable 'l1' [-Wunused-variable] int t, l1, l2, altitude; ^~ main.cpp:31:14: warning: unused variable 'l2' [-Wunused-variable] int t, l1, l2, altitude; ^~ main.cpp:31:18: warning: unused variable 'altitude' [-Wunused-variable] int t, l1, l2, altitude; ^~~~~~~~