Compilare: main.cpp: In function 'void solve()': main.cpp:21:9: warning: unused variable 'i' [-Wunused-variable] int i, x1, x2, y1, y2; ^ main.cpp:21:12: warning: unused variable 'x1' [-Wunused-variable] int i, x1, x2, y1, y2; ^~ main.cpp:21:16: warning: unused variable 'x2' [-Wunused-variable] int i, x1, x2, y1, y2; ^~ main.cpp:21:20: warning: unused variable 'y1' [-Wunused-variable] int i, x1, x2, y1, y2; ^~ main.cpp:21:24: warning: unused variable 'y2' [-Wunused-variable] int i, x1, x2, y1, y2; ^~