Compilare: main.cpp: In function 'void DFS(int)': main.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:27:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:50:9: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] int start; ^~~~~