Compilare: main.cpp: In function 'int main()': main.cpp:50:9: warning: unused variable 'a1' [-Wunused-variable] 50 | int a1, a2, a3; | ^~ main.cpp:50:13: warning: unused variable 'a2' [-Wunused-variable] 50 | int a1, a2, a3; | ^~ main.cpp:50:17: warning: unused variable 'a3' [-Wunused-variable] 50 | int a1, a2, a3; | ^~ main.cpp:51:9: warning: unused variable 'b1' [-Wunused-variable] 51 | int b1, b2, b3; | ^~ main.cpp:51:13: warning: unused variable 'b2' [-Wunused-variable] 51 | int b1, b2, b3; | ^~ main.cpp:51:17: warning: unused variable 'b3' [-Wunused-variable] 51 | int b1, b2, b3; | ^~ main.cpp:52:9: warning: unused variable 'd' [-Wunused-variable] 52 | int d; | ^