Compilare: main.cpp: In function 'int BFS(int)': main.cpp:23:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int i = 0; i < tree[element].size(); ++i) { | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void DFS(int, int)': main.cpp:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for (int i = 0; i < tree[node].size(); ++i) { | ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int BFS(int)': main.cpp:32:12: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] 32 | return last; | ^~~~