Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:23:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v[node].size() - 1 ; i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1 ; j < v[node].size() ; j++) ~~^~~~~~~~~~~~~~~~