Compilare: main.cpp: In function 'void queue_fill(std::vector<std::vector<std::pair<int, int> > >&, int, int, std::queue<std::pair<int, int> >&)': main.cpp:67:25: 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] 67 | if(0<=i && i<woods.size() && 0<=j && j<woods[i].size()){ | ~^~~~~~~~~~~~~ main.cpp:67:51: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | if(0<=i && i<woods.size() && 0<=j && j<woods[i].size()){ | ~^~~~~~~~~~~~~~~~