Submission #1296774

#	Time	Username	Problem	Language	Result	Execution time	Memory
1296774		ayaz	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include "bits/stdc++.h"
using namespace std;
#define int long long
#define isz(x) (int)x.size()

string guess_sequence(int n) {
  string res;
  vector<char> t(3);
  if (press("AB")) {
    if (press("A")) {
      res += 'A';
      t = {'B', 'X', 'Y'};
    } else {
      res += 'B';
      t = {'A', 'X', 'Y'};
    }
  } else {
    if (press("X")) {
      res += 'X';
      t = {'B', 'A', 'Y'};
    } else {
      res += 'Y';
      t = {'A', 'X', 'B'};
    }
  }
  assert(isz(res) == 1);
  for (int i = 1; i < n-1; i++) {
    auto s = res + t[0] + t[0] + res + t[0] + t[1] + res + t[0] + t[2] + res + t[1];
    auto x = press(s);
    if (x == isz(res) + 2) {
      res += t[0];
    } else if (x == isz(res) + 1) {
      res += t[1];
    } else if (x == isz(res)) {
      res += t[2];
    }
  }
  if (press(res + t[0]) == isz(res) + 1) {
    res += t[0];
  } else if (press(res + t[1]) == isz(res) + 1) {
    res += t[1];
  } else {
    res += t[2];
  }
  return res;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccD5M6Kl.o: in function `main':
grader.cpp:(.text.startup+0x4b): undefined reference to `guess_sequence[abi:cxx11](int)'
collect2: error: ld returned 1 exit status