Compilare: main.cpp: In function 'int main()': main.cpp:42:15: warning: unused variable 'x1' [-Wunused-variable] 42 | int i, j, x1, y1, x2, y2, x, y; | ^~ main.cpp:42:19: warning: unused variable 'y1' [-Wunused-variable] 42 | int i, j, x1, y1, x2, y2, x, y; | ^~ main.cpp:42:23: warning: unused variable 'x2' [-Wunused-variable] 42 | int i, j, x1, y1, x2, y2, x, y; | ^~ main.cpp:42:27: warning: unused variable 'y2' [-Wunused-variable] 42 | int i, j, x1, y1, x2, y2, x, y; | ^~ main.cpp:42:31: warning: unused variable 'x' [-Wunused-variable] 42 | int i, j, x1, y1, x2, y2, x, y; | ^ main.cpp:42:34: warning: unused variable 'y' [-Wunused-variable] 42 | int i, j, x1, y1, x2, y2, x, y; | ^