Compilare: user.cpp: In function ‘int put(int, int)’: user.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:53:25: warning: unused variable ‘x’ [-Wunused-variable] int n,k,x1,y1,x2,y2,x,y,i,j; ^ user.cpp:53:27: warning: unused variable ‘y’ [-Wunused-variable] int n,k,x1,y1,x2,y2,x,y,i,j; ^ user.cpp:53:31: warning: unused variable ‘j’ [-Wunused-variable] int n,k,x1,y1,x2,y2,x,y,i,j; ^