Submission #236903

#	Time	Username	Problem	Language	Result	Execution time	Memory
236903		michao	Combo (IOI18_combo)	C++14	97 / 100	38 ms	680 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
#define ll long long int
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
const char lit[4]={'X','Y','A','B'};
string guess_sequence(int n)
{
	string ans="";
	char first;
	if (press("X"))first='X';
	else if (press("Y"))first='Y';
	else if (press("A"))first='A';
	else first='B';
	ans+=first;
	if (n==1) return ans;
	vector<char>unused;
	unused.clear();
	for (int i=0;i<4;i++)if (lit[i]!=first)unused.pb(lit[i]);
	for (int i=1;i<=n-2;i++)
	{
		int news=press(ans+unused[0]+ans+unused[1]+unused[0]+ans+unused[1]+unused[1]+ans
		+unused[1]+unused[2]);
		if (news==sz(ans)+1)ans+=unused[0];
		else if (news==sz(ans)+2)ans+=unused[1];
		else ans+=unused[2];
	}
	
	if (press(ans+unused[0])==sz(ans)+1)ans+=unused[0];
	else if (press(ans+unused[1])==sz(ans)+1)ans+=unused[1];
	else ans+=unused[2];
	
	return ans;
}
 
/*
int32_t main()
{
  BOOST;
 
  return 0;
}
*/

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