Submission #425344

#	Time	Username	Problem	Language	Result	Execution time	Memory
425344		dariasc	Combo (IOI18_combo)	C++14	30 / 100	64 ms	548 KiB

combo

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

char chars[] = {'A', 'B', 'X', 'Y'};

string guess_sequence(int N) {
  string S = "Y";
  for (int i = 0; i < 3; i++) {
    if (press(string(1, chars[i])) == 1) {
      S = string(1, chars[i]);
      break;
    }
  }

  while (S.size() < N) {
    int asked = 0;
    for (int i = 0; i < 4; i++) {
      char btn = chars[i];
      if (btn != S[0]) {
        // we don't need to ask 3 times
        if (asked == 2) {
          S += btn;
          break;
        }

        string cpy = S;
        cpy += btn;
        if (press(cpy) > S.size()) {
          S += btn;
          break;
        }
        asked++;
      }
    }
  }

  return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:16:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   16 |   while (S.size() < N) {
      |          ~~~~~~~~~^~~
combo.cpp:29:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         if (press(cpy) > S.size()) {
      |             ~~~~~~~~~~~^~~~~~~~~~

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