Compilare: main.cpp: In function 'bool incompatibil(int, int)': main.cpp:13:9: warning: unused variable 'x1' [-Wunused-variable] int x1=G[i].first,y1=G[i].second,x2=G[j].first,y2=G[j].second; ^~ main.cpp:13:23: warning: unused variable 'y1' [-Wunused-variable] int x1=G[i].first,y1=G[i].second,x2=G[j].first,y2=G[j].second; ^~ main.cpp:13:38: warning: unused variable 'x2' [-Wunused-variable] int x1=G[i].first,y1=G[i].second,x2=G[j].first,y2=G[j].second; ^~ main.cpp:13:52: warning: unused variable 'y2' [-Wunused-variable] int x1=G[i].first,y1=G[i].second,x2=G[j].first,y2=G[j].second; ^~