Compilare: main.cpp: In function 'int main()': main.cpp:83:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::unordered_set<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for(j=0; j<v.size(); j++) | ~^~~~~~~~~ main.cpp:84:38: warning: comparison of integer expressions of different signedness: 'std::unordered_set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 84 | if(v[j].size() && v[j].size()<k) | ~~~~~~~~~~~^~ main.cpp:99:31: warning: comparison of integer expressions of different signedness: 'std::unordered_set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 99 | if(v[i].size()< k) | ~~~~~~~~~~~^~~