Submission #650006

#	Time	Username	Problem	Language	Result	Execution time	Memory
650006		tvladm2009	Combo (IOI18_combo)	C++14	100 / 100	48 ms	564 KiB

combo

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

using namespace std;

string brute(string s) {
  if (press(s + "A" + s + "B") > s.size()) {
    if (press(s + "A") > s.size()) {
      return s + "A";
    } else {
      return s + "B";
    }
  } else {
    if (press(s + "X") > s.size()) {
      return s + "X";
    } else {
      return s + "Y";
    }
  }
}

string smart(string s) {
  vector<char> kek(3);
  if (s[0] == 'A') {
    kek[0] = 'B';
    kek[1] = 'X';
    kek[2] = 'Y';
  } else if (s[0] == 'B') {
    kek[0] = 'A';
    kek[1] = 'X';
    kek[2] = 'Y';
  } else if (s[0] == 'X') {
    kek[0] = 'A';
    kek[1] = 'B';
    kek[2] = 'Y';
  } else {
    kek[0] = 'A';
    kek[1] = 'B';
    kek[2] = 'X';
  }

  string test = s + kek[1] + s + kek[2] + kek[0] + s + kek[2] + kek[1] + s + kek[2] + kek[2];
  int p = press(test);
  if (p == s.size()) {
    return s + kek[0];
  } else if (p == s.size() + 1) {
    return s + kek[1];
  } else {
    return s + kek[2];
  }
}

string guess_sequence(int n) {
  string ans;
  ans = brute(ans);
  for (int i = 2; i < n; i++) {
    ans = smart(ans);
  }
  if (n > 1) {
    ans = brute(ans);
  }
  return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string brute(std::string)':
combo.cpp:7:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |   if (press(s + "A" + s + "B") > s.size()) {
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
combo.cpp:8:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     if (press(s + "A") > s.size()) {
      |         ~~~~~~~~~~~~~~~^~~~~~~~~~
combo.cpp:14:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     if (press(s + "X") > s.size()) {
      |         ~~~~~~~~~~~~~~~^~~~~~~~~~
combo.cpp: In function 'std::string smart(std::string)':
combo.cpp:44:9: 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 (p == s.size()) {
      |       ~~^~~~~~~~~~~
combo.cpp:46:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |   } else if (p == s.size() + 1) {
      |              ~~^~~~~~~~~~~~~~~

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