Compilare: user.cpp: In function ‘int main()’: user.cpp:32:18: warning: unused variable ‘l1’ [-Wunused-variable] char l1 = a[0].second, l2 = a[1].second, l3 = a[2].second; ^ user.cpp:32:36: warning: unused variable ‘l2’ [-Wunused-variable] char l1 = a[0].second, l2 = a[1].second, l3 = a[2].second; ^ user.cpp:32:54: warning: unused variable ‘l3’ [-Wunused-variable] char l1 = a[0].second, l2 = a[1].second, l3 = a[2].second; ^ user.cpp:25:13: warning: unused variable ‘s’ [-Wunused-variable] int s = r + g + b; ^