Submission #799142

#	Time	Username	Problem	Language	Result	Execution time	Memory
799142		12345678	Combo (IOI18_combo)	C++17	97 / 100	38 ms	528 KiB

combo

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

using namespace std;

vector<char> c(4), ch;

string guess_sequence(int N) {
  string p;
  if (press("AB")) press("A") ? p="A" : p="B";
  else if (press("XY")) press("X") ? p="X" : p="Y";
  c[0]='A', c[1]='B', c[2]='X', c[3]='Y';
  for (auto x:c) if (x!=p[0]) ch.push_back(x);
  if (N==1) return p;
  for (int i=2; i<N; i++)
  {
    string tmp=p+ch[1];
    for (auto x:ch) tmp+=p+ch[2]+x;
    p+=ch[press(tmp)-i+1];
  }
  if (press(p+"A"+p+"B")==N) press(p+"A")==N ? p+="A" : p+='B';
  else if (press(p+"X")==N) p+="X";
  else p+="Y";
  return p;
}

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95