#include "combo.h" using namespace std; string guess_sequence(int n) { string s, ans; int ret = press("AB"); if (ret == 2) ans += "AB"; else if (ret == 1) { ret = press("A"); if (ret == 1) ans += "A"; else ans += "B"; } else { ret = press("X"); if (ret == 1) ans += "X"; else ans += "Y"; } if (ans.size() == n) return ans; vector<string> vec; if (ans[0] != 'A') vec.pb("A"); if (ans[0] != 'B') vec.pb("B"); if (ans[0] != 'X') vec.pb("X"); if (ans[0] != 'Y') vec.pb("Y"); while (ans.size() + 1 < n) { s = ans + vec[0] + ans + vec[1] + vec[0] + ans + vec[1] + vec[1] + ans + vec[1] + vec[2]; int ret = press(s); if (ret == (int)ans.size()) ans += vec[2]; if (ret == (int)ans.size() + 1) ans += vec[0]; if (ret == (int)ans.size() + 2) ans += vec[1]; } if (press(ans + vec[0]) == n) ans += vec[0]; else if (press(ans + vec[1]) == n) ans += vec[1]; else ans += vec[2]; return ans; }

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:22:5: error: 'vector' was not declared in this scope
   22 |     vector<string> vec;
      |     ^~~~~~
combo.cpp:2:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    1 | #include "combo.h"
  +++ |+#include <vector>
    2 | 
combo.cpp:22:18: error: expected primary-expression before '>' token
   22 |     vector<string> vec;
      |                  ^
combo.cpp:22:20: error: 'vec' was not declared in this scope
   22 |     vector<string> vec;
      |                    ^~~