Compilare: user.cpp: In function ‘int bs(int, int)’: user.cpp:23:9: warning: unused variable ‘last’ [-Wunused-variable] int last=-1,med,st,dr,i; ^~~~ user.cpp:23:17: warning: unused variable ‘med’ [-Wunused-variable] int last=-1,med,st,dr,i; ^~~ user.cpp:23:21: warning: variable ‘st’ set but not used [-Wunused-but-set-variable] int last=-1,med,st,dr,i; ^~ user.cpp: In function ‘int main()’: user.cpp:69:29: warning: ‘i2’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << bs(i1,i2) << '\n'; ^~~~ user.cpp:69:29: warning: ‘i1’ may be used uninitialized in this function [-Wmaybe-uninitialized]