Compilare: main.cpp: In function 'void permuRecu(std::vector<std::vector<int> >&, std::vector<int>, int)': main.cpp:6:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 6 | if (idx == arr.size()) { | ~~~~^~~~~~~~~~~~~ main.cpp:12:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for (int i = idx; i < arr.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 0; i < it.size(); i++) { | ~~^~~~~~~~~~~