Compilare: user.cpp: In function ‘void Solve()’: user.cpp:50:18: warning: unused variable ‘first’ [-Wunused-variable] bool first = 0; ^ user.cpp:51:17: warning: unused variable ‘x’ [-Wunused-variable] int x = 0; ^ user.cpp:88:21: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a; ^ user.cpp:103:21: warning: variable ‘z’ set but not used [-Wunused-but-set-variable] int z; ^ user.cpp:96:17: warning: variable ‘last’ set but not used [-Wunused-but-set-variable] int last = i; ^