Compilare: main.cpp: In function 'int main()': main.cpp:90:47: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<double, double> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", Ch.Up.size() + Ch.Dw.size()); ^ main.cpp:75:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:79:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", &p.x, &p.y); ^