Compilare: main.cpp: In function 'i64 bfs(i64, vec<std::vector<short int, std::allocator<short int> > >&)': main.cpp:211:34: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<std::vector<short int, std::allocator<short int> >, std::allocator<std::vector<short int, std::allocator<short int> > > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 211 | if (next.ft < 0 || next.ft >= v.size()) { | ~~~~~~~~^~~~~~~~~~~ main.cpp:214:34: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<std::vector<short int, std::allocator<short int> >, std::allocator<std::vector<short int, std::allocator<short int> > > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 214 | if (next.sd < 0 || next.sd >= v.size()) { | ~~~~~~~~^~~~~~~~~~~