Compilare: user.cpp: In function ‘void solve_1()’: user.cpp:13:22: warning: unused variable ‘x1’ [-Wunused-variable] int lmax=0,n,m,k,x1,y1,x2,y2,i,c=0; ^ user.cpp:13:25: warning: unused variable ‘y1’ [-Wunused-variable] int lmax=0,n,m,k,x1,y1,x2,y2,i,c=0; ^ user.cpp:13:28: warning: unused variable ‘x2’ [-Wunused-variable] int lmax=0,n,m,k,x1,y1,x2,y2,i,c=0; ^ user.cpp:13:31: warning: unused variable ‘y2’ [-Wunused-variable] int lmax=0,n,m,k,x1,y1,x2,y2,i,c=0; ^