Submission #298651

#	Time	Username	Problem	Language	Result	Execution time	Memory
298651		AmineTrabelsi	Combo (IOI18_combo)	C++17	100 / 100	41 ms	616 KiB

combo

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define v(x) vector<x>
#define pb push_back 
#define mp make_pair
const ll maxint=2e18;
const ll minint =-2e18;
/*
(͡ ° ͜ʖ ͡ °): Hi, be careful of overflow.
*/


int press(string p);
/*
// comment out when submitting
int cnt = 0;
int n;
int press(string p){
	cnt++;
	cout<<p<<endl;
	if((int)p.size() > n*4){
		cout<<"Failed press n="<<(int)p.size()<<endl;
		exit(0);
	}
	int x;
	cin>>x;
	return x;
}
*/
string let[4]={"A","B","X","Y"};

string guess_sequence(int N){
	//n=N;
	string res ="";
	int avoid = 0;
	int x = press(let[0]+let[1]);
	if(x >= 1){
		x = press(let[0]);
		if(x == 1){avoid=0;
			res+=let[0];
		}else {avoid=1;res += let[1];}
	}else{
		x = press(let[2]);
		if(x == 1){
			res+=let[2];avoid=2;
		}else {avoid=3;res +=let[3];}
	}
	vector<string> lett;
	for(int i=0;i<4;i++)if(i!=avoid)lett.push_back(let[i]);
	int i=1;
	for(;i<N-1;i++){
		x = press((res+lett[0]+lett[0]+res+lett[0]+lett[1]+res+lett[0]+lett[2]+res+lett[1]));
		if(x == i+2){
			res+=lett[0];
		}else if(x == i+1){
			res+=lett[1];
		}
		else{
			res += lett[2];
		}
	}
	if(i < N){
		x = press(res+lett[0]+res+lett[1]);
		if(x == i+1){
			x = press(res+lett[0]);
			if(x == i+1){
				res+=lett[0];
			}else res+=lett[1];
		}else{
			res += lett[2];
		}
	}
	return res;	
}
//* Notes: 
//* the first character of S never reappears in it

/*

// comment out when submitting

int main(){
	int n;
	cin>>n;
	cout<<guess_sequence(n)<<'\n';
	cout<<cnt<<endl;
	return 0;
}
*/
/*
5
YABAB

4 = q-N
*/

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