combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:4:3: error: 'vector' was not declared in this scope
4 | vector<string> v = {"A", "B", "X", "Y"};
| ^~~~~~
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 | using namespace std;
combo.cpp:4:16: error: expected primary-expression before '>' token
4 | vector<string> v = {"A", "B", "X", "Y"};
| ^
combo.cpp:4:18: error: 'v' was not declared in this scope
4 | vector<string> v = {"A", "B", "X", "Y"};
| ^