Compilare: main.cpp: In function 'int main()': main.cpp:53:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (int i = 0; i < v[x].size(); ++i) { | ~~^~~~~~~~~~~~~ main.cpp:58:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (int i = 0; i < v[y].size(); ++i) { | ~~^~~~~~~~~~~~~