Compilare: main.cpp: In function 'int main()': main.cpp:99:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<ob>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for (j = 0; j < it->second.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:142:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<ob2>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 142 | for (j = 0; j < it2->second.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~