Submission #1072539

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072539		Rigobertus	Combo (IOI18_combo)	C++17	30 / 100	32 ms	856 KiB

combo

#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <string>
#include "combo.h"
using namespace std;

string guess_sequence(int n) {
    string c[4] = {"A", "B", "X", "Y"};
    string s;
    if (press("AB")) {
        s = "B";
        if (press("A")) {
            s = "A";
        }
    }
    else {
        s = "X";
        if (press("Y")) {
            s = "Y";
        }
    }
    vector<int> a;
    for (int i = 0; i < 4; i++) {
        if (c[i] != s) {
            a.push_back(i);
        }
    }
    set<int> vis;
    for (int i = 0; i < 3; i++) {
        vis.insert(i);
    }
    while (s.size() < n) {
        int k;
        int last = *vis.rbegin();
        for (int i = 0; i < 3; i++) {
            k = i;
            if (!vis.count(i)) {
                vis.insert(i);
                continue;
            }
            if (i == last) {
                s += c[a[i]];
                break;
            }
            string p = s + c[a[i]] + c[a[i]];
            int x = press(p);
            if (x == p.size()) {
                s = p;
                break;
            }
            else if (x == s.size() + 1) {
                s += c[a[i]];
                vis.erase(i);
                break;
            }
        }
        for (int i = k + 1; i < 3; i++) {
            vis.insert(i);
        }
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:36:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     while (s.size() < n) {
      |            ~~~~~~~~~^~~
combo.cpp:51:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |             if (x == p.size()) {
      |                 ~~^~~~~~~~~~~
combo.cpp:55:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |             else if (x == s.size() + 1) {
      |                      ~~^~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95