Compilare: main.cpp: In function 'std::vector<int> sortTop(int, std::vector<std::vector<int> >)': main.cpp:28:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (i = 0; i < l[vf].size(); i++) | ~~^~~~~~~~~~~~~~ main.cpp:18:12: warning: unused variable 'j' [-Wunused-variable] 18 | int i, j, vf; | ^ main.cpp: In function 'int main()': main.cpp:67:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for (k = 0; k < lt[top[j]].size(); k++) | ~~^~~~~~~~~~~~~~~~~~~