Compilare: user.cpp: In function ‘int main()’: user.cpp:140:9: warning: unused variable ‘lasty’ [-Wunused-variable] int lasty = -1 , lastx = -1 , lastcost = 0 ; ^ user.cpp:140:22: warning: unused variable ‘lastx’ [-Wunused-variable] int lasty = -1 , lastx = -1 , lastcost = 0 ; ^ user.cpp:140:35: warning: unused variable ‘lastcost’ [-Wunused-variable] int lasty = -1 , lastx = -1 , lastcost = 0 ; ^