Compilare: user.cpp: In function ‘void Vizibil()’: user.cpp:63:21: warning: unused variable ‘x1’ [-Wunused-variable] int i,j,k,a,b,c,x1,x2,y1,y2; ^ user.cpp:63:24: warning: unused variable ‘x2’ [-Wunused-variable] int i,j,k,a,b,c,x1,x2,y1,y2; ^ user.cpp:63:27: warning: unused variable ‘y1’ [-Wunused-variable] int i,j,k,a,b,c,x1,x2,y1,y2; ^ user.cpp:63:30: warning: unused variable ‘y2’ [-Wunused-variable] int i,j,k,a,b,c,x1,x2,y1,y2; ^ user.cpp: In function ‘void Solve()’: user.cpp:92:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k; ^ user.cpp:93:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok; ^