Submission #380357

#	Time	Username	Problem	Language	Result	Execution time	Memory
380357		PixelCat	Combo (IOI18_combo)	C++14	100 / 100	51 ms	636 KiB

combo

/*                                                       
  /^--^\                                                 
  \____/                                                 
 /      \ _____  _ __  __ ____  _     ____   ____  _____ 
|        || ()_)| |\ \/ /| ===|| |__ / (__` / () \|_   _|
 \__  __/ |_|   |_|/_/\_\|____||____|\____)/__/\__\ |_|  
|^|^\ \^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|^|
| | |\ \| | | | | | | | | | | | | | | | | | | | | | | | |
#####/ /#################################################
| | |\/ | | | | | | | | | | | | | | | | | | | | | | | | |
|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|*/
//#pragma GCC optimize("O4,unroint-loops,no-stack-protector")
#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
using pii=pair<ll,ll>;
//using pii=pair<int,int>;
#define int ll //__int128
#define double long double

#define For(i,a,b)  for(int i=a;i<=b;i++)
#define Forr(i,a,b) for(int i=a;i>=b;i--)
#define F first
#define S second
#define L(id) (id*2+1)
#define R(id) (id*2+2)
#define LO(x) (x&(-x))

#define eb emplace_back
#define all(x) x.begin(),x.end()
#define sz(x) ((int)x.size())
#define mkp make_pair

#define MOD (int)(1e9+7)
#define INF (int)(1e15)
#define EPS (1e-9)

#ifdef LOCALMEOW
#define debug(...) do{\
  cerr << __LINE__ <<\
  " : ("#__VA_ARGS__ << ") = ";\
  _OUT(__VA_ARGS__);\
}while(0)
template<typename T> void _OUT(T x) { cerr << x << "\n"; }
template<typename T,typename...I>
void _OUT(T x,I ...tail) { cerr << x << ", "; _OUT(tail...); }
#else
#define debug(...)
#endif
inline void NYA(){ ios::sync_with_stdio(false); cin.tie(0); }

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
//mt19937 rng((ull)new char);
int gcd(int a,int b) { return b==0?a:gcd(b,a%b); }
int lcm(int a,int b) { return a/gcd(a,b)*b; }
int fpow(int b,int p,const int &mod){
  int ans=1,now=b;
  while(p){
    if(p&1) ans=ans*now%mod;
    p/=2; now=now*now%mod;
  }
  return ans;
}
int fpow(int b,int p) { return fpow(b,p,MOD); }
void chmin(int &a,const int &b) { if(b<a) a=b; }
void chmax(int &a,const int &b) { if(b>a) a=b; }

#include "combo.h"

string guess_sequence(int32_t N){
	if(N==1){
		if(press("A")==1) return "A";
		if(press("B")==1) return "B";
		if(press("X")==1) return "X";
		return "Y";
	}
	string ans="";
	int k=press("AB");
	if(k){
		//A or B
		k=press("A");
		if(k) ans="A";
		else  ans="B";
	}else{
		//X or Y
		k=press("X");
		if(k) ans="X";
		else  ans="Y";
	}
	string s="ABXY";
	For(i,0,3){
		if(s[i]==ans[0]){
			s.erase(i,1);
			break;
		}
	}
	For(i,1,N-2){
		k=press(ans+s[0]+ans+s[1]+s[0]+ans+s[1]+s[1]+ans+s[1]+s[2]);
		if(k==i) ans+=s[2];
		else if(k==i+1) ans+=s[0];
		else ans+=s[1];
	}
	if(press(ans+s[0])==N) ans+=s[0];
	else if(press(ans+s[1])==N) ans+=s[1];
	else ans+=s[2];
	//assert(press(ans)==N);
	return ans;
}

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