toy.cpp: In function 'void bt(int, int, long long int)':
toy.cpp:23:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
23 | if(pos==vec.size()){
| ~~~^~~~~~~~~~~~
toy.cpp: In function 'int main()':
toy.cpp:46:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<long long int>::size_type' {aka 'long unsigned int'} [-Wformat=]
46 | printf("%d\n",st.size());
| ~^ ~~~~~~~~~
| | |
| int std::set<long long int>::size_type {aka long unsigned int}
| %ld
toy.cpp:37:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
37 | scanf("%lld",&n);
| ~~~~~^~~~~~~~~~~