Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[nod].size(); i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:42:18: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(start, 0); ^