Submission #422183

#	Time	Username	Problem	Language	Result	Execution time	Memory
422183		Tangent	Combo (IOI18_combo)	C++17	100 / 100	38 ms	564 KiB

combo

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

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vii;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<vii> vvii;
typedef vector<vll> vvll;
typedef vector<vpii> vvpii;
typedef vector<vpll> vvpll;

#define ffor(i, a, b) for (ll i = a; i < b; i++)
#define rep(i, n) ffor(i, 0, n)
#define forin(x, a) for (auto &x: a)
#define all(a) a.begin(), a.end()

std::string guess_sequence(int N) {
  if (N == 1) {
    if (press("AB")) {
      if (press("A")) {
        return "A";
      } else {
        return "B";
      }
    } else {
      if (press("X")) {
        return "X";
      } else {
        return "Y";
      }
    }
  }

  string res, rem;
  if (press("AB")) {
    if (press("A")) {
      res = "A";
      rem = "BXY";
    } else {
      res = "B";
      rem = "AXY";
    }
  } else {
    if (press("X")) {
      res = "X";
      rem = "ABY";
    } else {
      res = "Y";
      rem = "ABX";
    }
  }

  while (res.size() < N - 1) {
    int ans = press(res + rem[0] + res + rem[1] + rem[0] + res + rem[1] + rem[1] + res + rem[1] + rem[2]);
    if (ans == res.size()) {
      res += rem[2];
    } else if (ans == res.size() + 1) {
      res += rem[0];
    } else {
      res += rem[1];
    }
  }

  if (press(res + rem[0]) == N) {
    return res + rem[0];
  }
  if (press(res + rem[1]) == N) {
    return res + rem[1];
  }

  return res + rem[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:59:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   59 |   while (res.size() < N - 1) {
      |          ~~~~~~~~~~~^~~~~~~
combo.cpp:61:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     if (ans == res.size()) {
      |         ~~~~^~~~~~~~~~~~~
combo.cpp:63:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     } else if (ans == res.size() + 1) {
      |                ~~~~^~~~~~~~~~~~~~~~~

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