Submission #930193

#	Time	Username	Problem	Language	Result	Execution time	Memory
930193		beaboss	Combo (IOI18_combo)	C++14	100 / 100	15 ms	2004 KiB

combo

#include "combo.h"

// Source: https://oj.uz/problem/view/IOI18_combo
// 

#include "bits/stdc++.h"

using namespace std;

#define s second
#define f first
#define pb push_back

typedef long long ll;

typedef pair<int, int> pii;
typedef vector<pii> vpii;

typedef vector<int> vi;

#define FOR(i, a, b) for (int i = (a); i<b; i++)

bool ckmin(int& a, int b){ return b < a ? a = b, true : false; }

bool ckmax(int& a, int b){ return b > a ? a = b, true : false; }

string guess_sequence(int N) {

  int ab = press("AB");

  string st = "";
  string ad = "";
  string doub;
  string lst;
  vector<string> pr;

  string poss = "ABXY";

  if (ab) {
    if (press("A")) st= "A";
    else st="B";
  } else {
    if (press("X")) st= "X";
    else st="Y";
  }

  if (N == 1) return st;

  string pref = st;

  for (char a: poss) {
    if (a == st[0]) continue;
    if (ad == "") ad = a;
    else if (pr.size() == 0) {
      // cout << 'd' << endl;
      for (char b: poss) {
        if (b != st[0]) {
          string aa = string() + a;
          string bb = string() + b;
          pr.pb(aa + bb);
          // cout << "d" + a + b << endl;
        }
      }
      doub = a;
    } else lst = a;
  }
  // for (auto val: pr) cout << val << endl;
  //   cout << ad << endl;
  // cout << pref << endl;
  assert(pr.size() == 3);

  FOR(i, 1, N-1) {
    string guess;
    guess += pref + ad;
    for (auto val: pr) guess += pref + val;
      // cout << pref << endl;
    int here = press(guess);
    if (here == pref.size()) pref += lst;
    else if (here == pref.size() + 1) pref += ad;
    else pref += doub;
  } 
  // cout << pref << endl;
  ab = press(pref + doub + pref + lst);
  // cout << pref << ab << lst << endl;
  if (ab > pref.size()) {
    // cout << 'd' << endl;
    if (press(pref + doub) > pref.size()) return pref + doub;
    else return pref + lst;
  } else {
    return pref + ad;
  }

  // return pref;




} 

// int main() {
//   ios::sync_with_stdio(false);
//   cin.tie(nullptr);


// }

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:78:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     if (here == pref.size()) pref += lst;
      |         ~~~~~^~~~~~~~~~~~~~
combo.cpp:79:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |     else if (here == pref.size() + 1) pref += ad;
      |              ~~~~~^~~~~~~~~~~~~~~~~~
combo.cpp:85:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |   if (ab > pref.size()) {
      |       ~~~^~~~~~~~~~~~~
combo.cpp:87:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |     if (press(pref + doub) > pref.size()) return pref + doub;
      |         ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~

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