Compilare: main.cpp: In function 'void backtrack()': main.cpp:14:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for (int i = 0; i < path.size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:20:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i = 0; i < arr.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:32:12: warning: unused variable 'x' [-Wunused-variable] 32 | int n, x; | ^