Compilare: main.cpp: In function 'void precalc()': main.cpp:50:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (int i = 0; i < dim.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int check(int, int, int)': main.cpp:63:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | if (island>=dim.size() || dim[island].empty()) { | ~~~~~~^~~~~~~~~~~~ main.cpp: In function 'std::string convert(int)': main.cpp:80:1: warning: control reaches end of non-void function [-Wreturn-type] 80 | } | ^