Compilare: user.cpp: In function ‘int main()’: user.cpp:113:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v1.size(); i++) ~~^~~~~~~~~~~ user.cpp:129:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v1[i].second.size() + v2h[l].second.size() < mi || mi == -1) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~ user.cpp:118:40: warning: unused variable ‘mid’ [-Wunused-variable] int l = 0, r = v2h.size() - 1, mid; ^~~ user.cpp:112:9: warning: unused variable ‘j’ [-Wunused-variable] int j = v2.size() - 1; ^