Compilare: main.cpp: In function 'void dfs(int)': main.cpp:20:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[k].size();i++){ ~^~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:29:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vt[k].size();i++){ ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<cc[i].size();j++) ~^~~~~~~~~~~~~