Compilare: main.cpp: In function 'void Do()': main.cpp:71:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i<S.size(); ++i) ~^~~~~~~~~ main.cpp:41:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp:43:11: warning: unused variable 'A' [-Wunused-variable] punct A,B; ^ main.cpp:43:13: warning: unused variable 'B' [-Wunused-variable] punct A,B; ^ main.cpp:42:33: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized] int xmin = INF, ymin = INF, idx; ^~~