Compilare: main.cpp: In function 'bool bfs()': main.cpp:39:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i < adj[c].size(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 102 | for (int i = 0; i < adj[2 * n + 1].size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:141:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 141 | for (int j = 1; j < adj[i].size(); j++) | ~~^~~~~~~~~~~~~~~