Compilare: main.cpp: In function 'int main()': main.cpp:32:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[gr[1].poz].size();i++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[gr[i].poz].size();j++) ~^~~~~~~~~~~~~~~~~~~~