Submission #1017074

#	Time	Username	Problem	Language	Result	Execution time	Memory
1017074		eldorbek_008	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

#define len(x) (int)(x).size()

std::string guess_sequence(int N) {
  string a;
  int x = press("AB");
  if (x > 0) {
    x = press("B");
    if (x > 0) {
      a = "B";
    } else {
      a = "A";
    }
  } else {
    x = press("Y");
    if (x > 0) {
      a = "Y";
    } else {
      a = "X";
    }
  }
  string r = "";
  string l = "ABXY";
  for (int i = 0; i < 4; i++) {
    if (l[i] != a[0]) {
      r += l[i];
    }
  }
  for (int i = 0; i < N - 2; i++) {
    string cur = a + r[1] + a + r[0] + r[1] + a + r[0] + r[0] + a + r[0] + r[2];
    int y = press(cur);
    if (y == len(a) + 1) {
      a += r[1]; // only a + r[1] can make len(a) + 1
    } else if (y == len(a) + 2) {
      a += r[0]; // next char must be r[0]
    } else {
      a += r[2]; // last choice
    }
  }
  string last = a + r[0] + a + r[1];
  x = guess(last);
  if (x == len(a) + 1) {
    last = a + r[0];
    x = guess(last);
    if (x == len(a)) {
      a += r[1];
    } else {
      a += r[0];
    }
  } else {
    a += r[2];
  }
  return a;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:45:7: error: 'guess' was not declared in this scope
   45 |   x = guess(last);
      |       ^~~~~