Compilare: main.cpp: In function 'int main()': main.cpp:15:12: warning: unused variable 'x1' [-Wunused-variable] int i, j, x1, y1, x2, y2, aa, bb; ^~ main.cpp:15:16: warning: unused variable 'y1' [-Wunused-variable] int i, j, x1, y1, x2, y2, aa, bb; ^~ main.cpp:15:20: warning: unused variable 'x2' [-Wunused-variable] int i, j, x1, y1, x2, y2, aa, bb; ^~ main.cpp:15:24: warning: unused variable 'y2' [-Wunused-variable] int i, j, x1, y1, x2, y2, aa, bb; ^~ main.cpp:15:28: warning: unused variable 'aa' [-Wunused-variable] int i, j, x1, y1, x2, y2, aa, bb; ^~ main.cpp:15:32: warning: unused variable 'bb' [-Wunused-variable] int i, j, x1, y1, x2, y2, aa, bb; ^~