Compilare: main.cpp: In function 'void dfs(int)': main.cpp:45:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<l[i].size();j++) ~^~~~~~~~~~~~ main.cpp:56:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<l[n].size();j++) ~^~~~~~~~~~~~ main.cpp:66:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(u=0;u<cr.size();u++) ~^~~~~~~~~~ main.cpp:67:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<l[i].size();j++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[1].size();i++) ~^~~~~~~~~~~~