Submission #1209260

#	Time	Username	Problem	Language	Result	Execution time	Memory
1209260		AksLolCoding	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
using namespace std;

// string S = "ABXYY";
// int queries = 0;

// int press(string p) {
//     queries++;
//     int n = S.size();
//     for (int i = n; i > 0; i--) {
//         if (p.find(S.substr(0, i)) != string::npos) {
//             return i;
//         }
//     }
//     return 0;
// }

char chars[] = "ABXY";
string guess_sequence(int n) {
    // find first char
    int first = 3;
    for (int i = 0; i < 3; i++) if (press({chars[i]}) == 1) {
        first = i;
        break;
    }
    swap(chars[first], chars[3]);

    // find rest
    string res = {chars[3]};
    for (int i = 1; i < n-1; i++) {
        string p = res + chars[0];
        for (int i = 0; i < 3; i++) p += res + chars[1] + chars[i];
        int x = press(p);
        res += chars[(x == i) ? 2 : (x == i + 1) ? 0 : 1];
    }
    for (int i = 0; i < 2; i++) {
        if (press(res + chars[i]) == n) {
            res += chars[i];
            break;
        }
    }
    if (res.size() < n) res += chars[2];
    return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:22:37: error: 'press' was not declared in this scope
   22 |     for (int i = 0; i < 3; i++) if (press({chars[i]}) == 1) {
      |                                     ^~~~~
combo.cpp:33:17: error: 'press' was not declared in this scope; did you mean 'res'?
   33 |         int x = press(p);
      |                 ^~~~~
      |                 res
combo.cpp:37:13: error: 'press' was not declared in this scope; did you mean 'res'?
   37 |         if (press(res + chars[i]) == n) {
      |             ^~~~~
      |             res