Submission #630467

#	Time	Username	Problem	Language	Result	Execution time	Memory
630467		NintsiChkhaidze	Combo (IOI18_combo)	C++14	88 / 100	43 ms	544 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define pb push_back
using namespace std;
 
vector <char> v = {'A', 'B', 'X', 'Y'}, w;
string guess_sequence(int N) {
  string S = "";
 
  for (char c: v){
    string P = S + c;
    if (press(P) == 1) {
      S = P; 
      break;
    }
  }
  
  char f = S[0];
  
  for (auto c: v)
      if (c!=f) w.pb(c);
    
  while (S.size() < N - 1){
    string p = S + w[0] + S + w[1] + w[0] + S + w[1] + w[1] + S + w[1] + w[2];
    int coins = press(p),s = S.size();
    if (coins == s) S += w[2];
    else if (coins == s + 1) S += w[0];
    else if (coins == s + 2) S += w[1];
  }

  for (char c: w){
    string P = S + c;
    if (press(P) == S.size() + 1) {
      S = P; 
      break;
    }
  }
  
  return S;
}

// ABXYBXXXXBY

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:23:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   23 |   while (S.size() < N - 1){
      |          ~~~~~~~~~^~~~~~~
combo.cpp:33:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     if (press(P) == S.size() + 1) {
      |         ~~~~~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 83 / 95