Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:13:15: 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:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vt[nod].size();++i) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:60:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();++j) ~^~~~~~~~~~~~ main.cpp:78:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<usu[i].size();++j) ~^~~~~~~~~~~~~~ main.cpp:89:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<usut[i].size();++j) ~^~~~~~~~~~~~~~~ main.cpp:100:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<comp[i].size();++j) sol.push_back(comp[i][j]); ~^~~~~~~~~~~~~~~ main.cpp:105:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) g<<sol[i]<<' '; ~^~~~~~~~~~~