Compilare: user.cpp: In function ‘bool going_left(std::pair<double, double>, std::pair<double, double>, std::pair<double, double>)’: user.cpp:30:10: warning: unused variable ‘res’ [-Wunused-variable] double res = ^ user.cpp: In function ‘int main(int, char**)’: user.cpp:117:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < deq.size() - 1; i++) { ^