Submission #1200447

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200447		tamzid	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
using namespace std;

int best = 0;
string ans;
vector<char> ch{'A','B','X','Y'};

void backtrack(string p,int n,int i)
{
    if(p.size() == 4 * n + 1)
    {
        return;
    }
    else
    {
      int a = press(p);
        if(a > best)
        {
            ans = p;
            best = a;
        }
        for(int j=0;j<4;++j)
        {
            if(i != j)
            {
              backtrack(p + ch[i], n, i);
            }
        }
    }
}

string guess_sequence(int N) {
  string p = "";
  vector<bool> vis(4,0);
  for(int i=0;i<4;++i)
  {
      p[0] = ch[i];
      backtrack(p,N,i);
  }
  return ans;
}

Compilation message (stderr)

combo.cpp:6:1: error: 'vector' does not name a type
    6 | vector<char> ch{'A','B','X','Y'};
      | ^~~~~~
combo.cpp: In function 'void backtrack(std::string, int, int)':
combo.cpp:26:29: error: 'ch' was not declared in this scope
   26 |               backtrack(p + ch[i], n, i);
      |                             ^~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:34:3: error: 'vector' was not declared in this scope
   34 |   vector<bool> vis(4,0);
      |   ^~~~~~
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:34:10: error: expected primary-expression before 'bool'
   34 |   vector<bool> vis(4,0);
      |          ^~~~
combo.cpp:37:14: error: 'ch' was not declared in this scope
   37 |       p[0] = ch[i];
      |              ^~