Submission #650728

#	Time	Username	Problem	Language	Result	Execution time	Memory
650728		erke	Combo (IOI18_combo)	C++11	Compilation error	0 ms	0 KiB

combo

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

string guess_sequence(int n) {
    vector<char> v = {'A', 'B', 'X', 'Y'};
    string ret;
    if (press("AB")) {
        if (press("A")) {
            ret += 'A';
            swap(v[0], v[3]);
        }
        else {
            ret += 'B';
            swap(v[1], v[3]);
        }
    }
    else {
        if (press("X")) {
            ret += 'X';
            swap(v[2], v[3]);
        }
        else {
            ret += 'Y';
            // swap(v[3], v[3]);
        }
    }
    while ((int) ret.size() < n - 1) {
        string tmp = ret + v[0];
        for (int i = 0; i < 3; i++) {
            tmp += ret + v[1] + v[i];
        }
        int p = press(tmp);
        if (p == (int) ret.size() + 1) {
            ret += v[0];
        }
        else if (p == (int) ret.size() + 2) {
            ret += v[1];
        }
        else {
            ret += v[2];
        }
    }
    if (press(ret + v[0]) == n) {
        ret += v[0];
    }
    else if (press(ret + v[1]) == n) {
        ret += v[1];
    }
    else {
        ret += v[2];
    }
    return ret;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:7:9: error: 'press' was not declared in this scope
    7 |     if (press("AB")) {
      |         ^~~~~
combo.cpp:32:17: error: 'press' was not declared in this scope
   32 |         int p = press(tmp);
      |                 ^~~~~
combo.cpp:43:9: error: 'press' was not declared in this scope
   43 |     if (press(ret + v[0]) == n) {
      |         ^~~~~