Compilare: user.cpp: In function ‘int main()’: user.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v1.size(); i++) ~~^~~~~~~~~~~ user.cpp:87:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v1[i].second.size() + v2[j].second.size() < mi || mi == -1) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~