Submission #281716

#	Time	Username	Problem	Language	Result	Execution time	Memory
281716		MrDomino	Combo (IOI18_combo)	C++14	100 / 100	39 ms	572 KiB

combo

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

using namespace std;

string del(string s, char ch) {
  string t;
  for (auto &x : s) {
    if (x != ch) {
      t += x;
    }
  }
  return t;
}

string mult(char ch, int x) {
  string s;
  for (int i = 1; i <= x; i++) {
    s += ch;
  }
  return s;
}

string guess_sequence(int n) {
  string sol;
  string posi = "ABXY";
  if (press(sol + posi[0] + posi[1]) > 0) {
    if (press(sol + posi[0])) {
      sol += posi[0];
    } else {
      sol += posi[1];
    }
  } else {
    if (press(sol + posi[2])) {
      sol += posi[2];
    } else {
      sol += posi[3];
    }
  }
  posi = del(posi, sol[0]);
  while ((int) sol.size() + 2 <= n) {
    char a = posi[0];
    char b = posi[1];
    char c = posi[2];
    int ret = press(sol + a + a + sol + a + b + sol + a + c + sol + b);
    if (ret == (int) sol.size() + 2) {
      sol += a;
      continue;
    }
    if (ret == (int) sol.size() + 1) {
      sol += b;
      continue;
    }
    sol += c;
  }
  if ((int) sol.size() == n - 1) {
    char a = posi[0];
    char b = posi[1];
    char c = posi[2];
    if (press(sol + a) == n) {
      sol += a;
    } else {
      if (press(sol + b) == n) {
        sol += b;
      } else {
        sol += c;
      }
    }
  }
  return sol;
}

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