Compilare: user.cpp: In function ‘int main()’: user.cpp:129:21: warning: variable ‘cost’ set but not used [-Wunused-but-set-variable] int x , y , cost ; ^ user.cpp:138:9: warning: unused variable ‘lasty’ [-Wunused-variable] int lasty = -1 , lastx = -1 , lastcost = 0 ; ^ user.cpp:138:22: warning: unused variable ‘lastx’ [-Wunused-variable] int lasty = -1 , lastx = -1 , lastcost = 0 ; ^ user.cpp:138:35: warning: unused variable ‘lastcost’ [-Wunused-variable] int lasty = -1 , lastx = -1 , lastcost = 0 ; ^