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#include <iostream>
using namespace std;
 
int main() {
	// your code goes here
	return 0;
}
 
std::string who_is_next(std::vector<std::string> v, long n) {
  long l = pow(2, floor(log2(ceil((double)n-- / v.size()))));
  return v[(n - (l - 1) * v.size()) / l];
}

prog.cpp:9:30: error: ‘vector’ is not a member of ‘std’
 std::string who_is_next(std::vector<std::string> v, long n) {
                              ^~~~~~
prog.cpp:9:30: note: ‘std::vector’ is defined in header ‘<vector>’; did you forget to ‘#include <vector>’?
prog.cpp:2:1:
+#include <vector>
 using namespace std;
prog.cpp:9:30:
 std::string who_is_next(std::vector<std::string> v, long n) {
                              ^~~~~~
prog.cpp:9:48: error: expected primary-expression before ‘>’ token
 std::string who_is_next(std::vector<std::string> v, long n) {
                                                ^
prog.cpp:9:50: error: ‘v’ was not declared in this scope
 std::string who_is_next(std::vector<std::string> v, long n) {
                                                  ^
prog.cpp:9:53: error: expected primary-expression before ‘long’
 std::string who_is_next(std::vector<std::string> v, long n) {
                                                     ^~~~
prog.cpp:9:61: error: expected ‘,’ or ‘;’ before ‘{’ token
 std::string who_is_next(std::vector<std::string> v, long n) {
                                                             ^

Standard output is empty