Compilare: main.cpp: In function 'int main()': main.cpp:35:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | while (head < q.size()) { | ~~~~~^~~~~~~~~~ main.cpp:45:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for (int j = 0; j < q.size(); j += 2) { | ~~^~~~~~~~~~ main.cpp:46:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | if (j + 2 < q.size()) { | ~~~~~~^~~~~~~~~~