Compilare: main.cpp: In function 'int main()': main.cpp:23:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<short int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int j = 0; j < a[i].size(); j++) | ~~^~~~~~~~~~~~~ main.cpp:28:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<short int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int j = 0; j < util.size(); j++) | ~~^~~~~~~~~~~~~