Compilare: main.cpp: In function 'int main()': main.cpp:111:21: warning: unused variable 'x1' [-Wunused-variable] int q,i,j,u,a,b,x1,y1,x2,y2; ^~ main.cpp:111:24: warning: unused variable 'y1' [-Wunused-variable] int q,i,j,u,a,b,x1,y1,x2,y2; ^~ main.cpp:111:27: warning: unused variable 'x2' [-Wunused-variable] int q,i,j,u,a,b,x1,y1,x2,y2; ^~ main.cpp:111:30: warning: unused variable 'y2' [-Wunused-variable] int q,i,j,u,a,b,x1,y1,x2,y2; ^~