Submission #261463

#	Time	Username	Problem	Language	Result	Execution time	Memory
261463		Valera_Grinenko	Combo (IOI18_combo)	C++17	0 / 100	1 ms	200 KiB

combo

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
#include "combo.h"
#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <set>
#include <stack>
#include <map>
#include <iomanip>
#include <cmath>
#include <queue>
#include <bitset>
#include <numeric>
#include <array>
#include <cstring>
#include <random>
#include <chrono>
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define make_unique(x) sort(all((x))); (x).resize(unique(all((x))) - (x).begin())
typedef long long ll;
typedef long double ld;
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
string guess_sequence(int n) {
  string ans;
  int st = press("XY");
  if(st)
    if(press("X")) ans = "X";
    else ans = "Y";
  else if(press("A")) ans = "A";
  else ans = "B";
  vector<char> ask(4); ask[0] = 'A'; ask[1] = 'B'; ask[2] = 'X'; ask[3] = 'Y';
  ask.erase(find(all(ask), ans[0]));
  for(int i = 1; i < n; i++) {
    string query = ans + ask[0] + ans + ask[1] + ask[0] + ans + ask[1] + ask[1] + ans + ask[1] + ask[2];
    int c = press(query);
    if(c == ans.size()) ans += ans[2];
    else if(c == ans.size() + 1) ans += ask[0];
    else ans += ask[1];
  }
  return ans;
}
/*

*/

Compilation message (stderr)

combo.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      | 
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:45:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     if(c == ans.size()) ans += ans[2];
      |        ~~^~~~~~~~~~~~~
combo.cpp:46:15: 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(c == ans.size() + 1) ans += ask[0];
      |             ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95