Submission #788195

#	Time	Username	Problem	Language	Result	Execution time	Memory
788195		Bula	Combo (IOI18_combo)	C++17	100 / 100	29 ms	588 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
//#define int ll
const ll mod=1e9+7;

string guess_sequence(int n){
	string s;
	vector<string> v={"A","B","X","Y"};
	int x;
	if(press("AB")>0){
		if(press("A")==1){
			s=v[0];
			x=0;		
		}else{
			s=v[1];
			x=1;
		}
	}else{
		if(press("X")==1){
			s=v[2];
			x=2;
		}else{
			s=v[3];
			x=3;
		}
	}
	vector<string> t;
	for(int i=0;i<4;i++){
		if(i!=x) t.pb(v[i]);
	}
	if(n==1) return s;
	for(int i=1;i<n-1;i++){
		string p=s+t[0];
		for(int j=0;j<3;j++){
			string k=s+t[1];
			k+=t[j];
			p+=k;
		}
		int N=(int) s.size();
		int c=press(p);
		if(c==N){
			s+=t[2];
		}else if(c==N+1) s+=t[0];
		else s+=t[1];
	}
	
	for(int i=0;i<2;i++){
		string p=s+t[i];
		int c=press(p);
		if(c==n){
			s+=t[i];
			break;
		}
	}
	if((int) s.size() == n-1) s+=t[2];
	return s;
}

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