Compilare: user.cpp:9:1: warning: ‘typedef’ was ignored in this declaration [enabled by default] }; ^ user.cpp: In lambda function: user.cpp:28:189: warning: control reaches end of non-void function [-Wreturn-type] sort(PTS + 1, PTS + N + 1, [&](const Point&a, const Point&b)->bool{if (a.first<b.first)return 1; else if (a.first>b.first)return 0; else if (a.first == b.first)return a.second < b.second;}); ^