Compilare: main.cpp: In function 'int main()': main.cpp:31:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | while ( it1 < v[i].size() && v[i][it1].first <= dr + 1 ) { | ~~~~^~~~~~~~~~~~~ main.cpp:35:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | while ( it2 < v[j].size() && v[j][it2].first <= dr + 1 ) { | ~~~~^~~~~~~~~~~~~