Submission #101400

#	Time	Username	Problem	Language	Result	Execution time	Memory
101400		briansu	Combo (IOI18_combo)	C++14	100 / 100	64 ms	592 KiB

combo

//{
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double lf;
typedef pair<ll,ll> ii;
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define FILL(i,n) memset(i,n,sizeof i)
#define X first
#define Y second
#define SZ(_a) (int)_a.size()
#define ALL(_a) _a.begin(),_a.end()
#define pb push_back
#ifdef brian
#define debug(...) do{\
    fprintf(stderr,"%s - %d (%s) = ",__PRETTY_FUNCTION__,__LINE__,#__VA_ARGS__);\
    _do(__VA_ARGS__);\
}while(0)
template<typename T>void _do(T &&_x){cerr<<_x<<endl;}
template<typename T,typename ...S> void _do(T &&_x,S &&..._t){cerr<<_x<<" ,";_do(_t...);}
template<typename _a,typename _b> ostream& operator << (ostream &_s,const pair<_a,_b> &_p){return _s<<"("<<_p.X<<","<<_p.Y<<")";}
template<typename It> ostream& _OUTC(ostream &_s,It _ita,It _itb)
{
    _s<<"{";
    for(It _it=_ita;_it!=_itb;_it++)
    {
        _s<<(_it==_ita?"":",")<<*_it;
    }
    _s<<"}";
    return _s;
}
template<typename _a> ostream &operator << (ostream &_s,vector<_a> &_c){return _OUTC(_s,ALL(_c));}
template<typename _a> ostream &operator << (ostream &_s,set<_a> &_c){return _OUTC(_s,ALL(_c));}
template<typename _a,typename _b> ostream &operator << (ostream &_s,map<_a,_b> &_c){return _OUTC(_s,ALL(_c));}
template<typename _t> void pary(_t _a,_t _b){_OUTC(cerr,_a,_b);cerr<<endl;}
#define IOS()
#else
#define debug(...)
#define pary(...)
#define endl '\n'
#define IOS() ios_base::sync_with_stdio(0);cin.tie(0);
#endif // brian
//}

#include "combo.h"

std::string guess_sequence(int N) {
  string s = "";
  vector<char> v;
  if(press("AB"))
  {
    if(press("A"))s.pb('A');
    else s.pb('B');
  }else{
    if(press("X"))s.pb('X');
    else s.pb('Y');
  }
  if(N==1)return s;
  string m = "ABXY";
  REP(i,4)if(s[0] != m[i])v.pb(m[i]);
  while(SZ(s) < N-1)
  {
    string r = "";
    r += s;
    r.pb(v[0]);
    r += s;
    r.pb(v[1]);
    r.pb(v[0]);
    r += s;
    r.pb(v[1]);
    r.pb(v[1]);
    r += s;
    r.pb(v[1]);
    r.pb(v[2]);
    ll t = press(r);
    if(t == SZ(s))s.pb(v[2]);
    else if(t == SZ(s) + 1)s.pb(v[0]);
    else s.pb(v[1]);
    debug(s);
  }
  string r = s + "A" + s + "B";
  debug(v);
  if(press(r) == N)
  {
    if(press(s + "A") == N)s.pb('A');
    else s.pb('B');
  }
  else
  {
    if(press(s + "X") == N)s.pb('X');
    else s.pb('Y');
  }
  return s;
}

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