Submission #293710

#	Time	Username	Problem	Language	Result	Execution time	Memory
293710		TheLorax	Combo (IOI18_combo)	C++11	30 / 100	63 ms	580 KiB

combo

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

#define F first
#define S second
#define SZ(a) ((int)(a).size())
#define PB push_back
#define ALL(a) (a).begin(), (a).end()

using namespace std;

typedef long long ll;
typedef pair<ll, ll> ii;

std::string guess_sequence(int n) {
  std::string p = "AB";
  int c = press(p);
  if(!c){
    p="XY";
    c=press(p);
  }
  std::string s;
  if(c==2)
    s=p;
  else
    if(c==1){
      c=press(p.substr(0,1));
      if(c)
        s+=p[0];
      else
        s+=p[1];
    }
  std::vector<char> a;
  for(auto x: {'A','B','X','Y'})
    if(s[0]!=x)
      a.PB(x);
  while (SZ(s)<n) {
    p=s+a[0];
    c=press(p);
    if(c==SZ(p)){
      s+=a[0];
      continue;
    }
    p=s+a[1];
    c=press(p);
    if(c==SZ(p))
      s+=a[1];
    else
      s+=a[2];
  }
  return s;
}

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95