Compilare: main.cpp: In function 'void dfs2(int, int, int)': main.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: At global scope: main.cpp:78:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^