Compilare: main.cpp: In function 'int main()': main.cpp:28:9: warning: unused variable 'xa' [-Wunused-variable] int xa, xb, ya, yb, dist, i, top = 0; ^~ main.cpp:28:13: warning: unused variable 'xb' [-Wunused-variable] int xa, xb, ya, yb, dist, i, top = 0; ^~ main.cpp:28:17: warning: unused variable 'ya' [-Wunused-variable] int xa, xb, ya, yb, dist, i, top = 0; ^~ main.cpp:28:21: warning: unused variable 'yb' [-Wunused-variable] int xa, xb, ya, yb, dist, i, top = 0; ^~ main.cpp:28:25: warning: unused variable 'dist' [-Wunused-variable] int xa, xb, ya, yb, dist, i, top = 0; ^~~~