Compilare: main.cpp: In function 'int main()': main.cpp:13:19: warning: unused variable 'x1' [-Wunused-variable] int n,m,k,c,i,x1,y1,x2,y2,ii; ^~ main.cpp:13:22: warning: unused variable 'y1' [-Wunused-variable] int n,m,k,c,i,x1,y1,x2,y2,ii; ^~ main.cpp:13:25: warning: unused variable 'x2' [-Wunused-variable] int n,m,k,c,i,x1,y1,x2,y2,ii; ^~ main.cpp:13:28: warning: unused variable 'y2' [-Wunused-variable] int n,m,k,c,i,x1,y1,x2,y2,ii; ^~