Compilare: main.cpp: In function 'int main()': main.cpp:71:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<t[1].size();i++) ~^~~~~~~~~~~~ main.cpp:85:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<t[x.nod].size();i++) ~^~~~~~~~~~~~~~~~