Submission #1294179

#	Time	Username	Problem	Language	Result	Execution time	Memory
1294179		lucaskojima	Combo (IOI18_combo)	C++17	10 / 100	15 ms	456 KiB

combo

#include "bits/stdc++.h"
#include "combo.h"
#define sz(x) (int)size(x)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)

using namespace std;
using ll = long long;
using pii = pair<int, int>;

const char nl = '\n';
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;

mt19937 rng(time(0));

string guess_sequence(int n) {
  string ans;
  vector<char> v = {'A', 'B', 'X', 'Y'};

  for (int i = 0; i < n; i++) {
    shuffle(all(v), rng);
    for (char c : v) {
      string cur = ans;
      cur.push_back(c);
      int x = press(cur);
      if (x == i + 1) {
        ans = cur;
        break;
      }
    }
  }

  return ans;
}

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