Compilare: main.cpp: In function 'int main()': main.cpp:23:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<u[i].size();j++) ~^~~~~~~~~~~~ main.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(r=0;r<u[nod].size();r++) ~^~~~~~~~~~~~~~ main.cpp:73:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=s[c[p]];j<v[c[p]].size();j++) ~^~~~~~~~~~~~~~~