Compilare: main.cpp: In function 'void bfs(std::vector<std::vector<int> >&, int)': main.cpp:34:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i = 1; i<distance.size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void afisare(std::vector<std::vector<int> >&, int)': main.cpp:50:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int j=0; j<matrix[i].size(); j++) | ~^~~~~~~~~~~~~~~~~