Submission #123780

#	Time	Username	Problem	Language	Result	Execution time	Memory
123780		mlyean00	Combo (IOI18_combo)	C++14	91 / 100	43 ms	456 KiB

combo

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

using namespace std;

string moves = "ABXY";

int N;
string s;

void get_first() {
    for (char c : moves) {
        if (press(string(1, c)) == 1) {
            s = c;
            break;
        }
    }
    moves.erase(moves.find(s[0]), 1);
}

void get_next() {
    string p = s + moves[0];
    for (char c : moves) {
        p += s;
        p.push_back(moves[1]);
        p.push_back(c);
    }

    switch (press(p) - s.size()) {
    case 0:
        s.push_back(moves[2]);
        break;
    case 1:
        s.push_back(moves[0]);
        break;
    case 2:
        s.push_back(moves[1]);
        break;
    }
}

void get_last() {
    for (char c : moves) {
        if (press(s + c) > s.size()) {
            s += c;
            return;
        }
    }
}

string guess_sequence(int n) {
    int N = n;
    get_first();
    for (int i = 1; i < N - 1; ++i)
        get_next();
    if (N > 1) get_last();
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'void get_last()':
combo.cpp:44:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         if (press(s + c) > s.size()) {
      |             ~~~~~~~~~~~~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 86 / 95