Compilare: main.cpp: In function 'void dfs(int)': main.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<g[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:38:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++) ~^~~~~~~~~