Compilare: main.cpp: In function 'void adauga(int, int)': main.cpp:13:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[a].size() && ok==-1; i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[i].size(); j++) ~^~~~~~~~~~~~