Compilare: user.cpp: In function ‘long long int slv(std::vector<std::tuple<int, int, int> >)’: user.cpp:19:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1, aux = (int) stk.size(); i < pts.size(); i ++ ) { ^ user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( stk.size() > aux && ccw( pts[stk[stk.size() - 2]], pts[stk[stk.size() - 1]], pts[i] ) < 0 ) { ^ user.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( stk.size() > aux && ccw( pts[stk[stk.size() - 2]], pts[stk[stk.size() - 1]], pts[i] ) < 0 ) { ^ user.cpp:45:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( count( mrk.begin(), mrk.end(), 1 ) != mrk.size() || mrk.size() < 3 ) ^ user.cpp:50:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i < stk.size(); i ++ ) ^