Compilare: user.cpp: In function ‘int main()’: user.cpp:98:17: warning: unused variable ‘ymin’ [-Wunused-variable] double xmin,ymin,xmax,ymax; ^ user.cpp:98:22: warning: unused variable ‘xmax’ [-Wunused-variable] double xmin,ymin,xmax,ymax; ^ user.cpp:98:27: warning: unused variable ‘ymax’ [-Wunused-variable] double xmin,ymin,xmax,ymax; ^ user.cpp: In function ‘double bs(int, int)’: user.cpp:90:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:130:9: warning: ‘xmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(Q.first<xmin) ^