Compilare: main.cpp: In function 'void backtrack(int)': main.cpp:12:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 12 | if (path.size() <= n && !path.empty()) { | ~~~~~~~~~~~~^~~~ main.cpp:13:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int i = 0; i < path.size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:16:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 16 | if (path.size() == n) | ~~~~~~~~~~~~^~~~