Compilare: main.cpp: In function 'int main()': main.cpp:106:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < anss.size(); ++i) ~~^~~~~~~~~~~~~ main.cpp:82:33: warning: 'yy' may be used uninitialized in this function [-Wmaybe-uninitialized] g << xx << " " << yy << " " << ans << '\n'; ^~~ main.cpp:82:20: warning: 'xx' may be used uninitialized in this function [-Wmaybe-uninitialized] g << xx << " " << yy << " " << ans << '\n'; ^~~