Submission #199347

#	Time	Username	Problem	Language	Result	Execution time	Memory
199347		mythos	Combo (IOI18_combo)	C++14	100 / 100	58 ms	564 KiB

combo

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

using namespace std;

string guess_sequence(int N) {
    string p = "";
    if (press("AB") >= 1) p = press("A") ? "A" : "B";
    else p = press("X") ? "X" : "Y";

    vector<char> chr = {'A', 'B', 'X', 'Y'};
    chr.erase(find(chr.begin(), chr.end(), p[0]));

    while ((int) p.size() <= N - 2) {
        int que = press(p + chr[0] + chr[0] + p + chr[0] + chr[1] + p + chr[1] + chr[0]);
        if (que == (int) p.size()) p.push_back(chr[2]);
        else if (que == p.size() + 1) {
            que = press(p + chr[1] + chr[2]);
            if (que == (int) p.size()) p = p + chr[0] + chr[2];
            else if (que == (int) p.size() + 1) p = p + chr[1] + chr[1];
            else p = p + chr[1] + chr[2];
        }
        else {
            que = press(p + chr[0] + chr[1]);
            if (que == (int) p.size()) p = p + chr[1] + chr[0];
            else if (que == (int) p.size() + 1) p = p + chr[0] + chr[0];
            else p = p + chr[0] + chr[1];
        }
    }

    while ((int) p.size() != N) {
        if (press(p + chr[0]) == (int) p.size() + 1) p.push_back(chr[0]);
        else if (press(p + chr[1]) == (int) p.size() + 1) p.push_back(chr[1]);
        else p.push_back(chr[2]);
    }

    return p;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:17:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         else if (que == p.size() + 1) {
      |                  ~~~~^~~~~~~~~~~~~~~

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