Compilare: main.cpp: In function 'void dfs(int)': main.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tr[nod].size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:77:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ctc[i].size(); ++j) ~~^~~~~~~~~~~~~~~ main.cpp:80:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < v[nd].size(); ++k) ~~^~~~~~~~~~~~~~