Submission #380908

#	Time	Username	Problem	Language	Result	Execution time	Memory
380908		ritul_kr_singh	Combo (IOI18_combo)	C++17	100 / 100	55 ms	700 KiB

combo

#include "combo.h"
#include "bits/stdc++.h"
using namespace std;
 
string guess_sequence(int n){
	string s;
	if(press("AB"))
		s = press("A") ? "A" : "B";
	else
		s = press("X") ? "X" : "Y";
 
	string all, orig = "ABXY";
  	if(n==1) return s;
	for(char c : orig) if(c!=s[0]) all.push_back(c);
 
	for(int i=1; i+1<n; ++i){
		string t;
		for(char c : all) t+=(s + all[2]), t+=c;
		t+=s, t+=all[1];
		s += all[press(t)-i];
	}
 
	string t;
	if(press(s+all[0]+s+all[1])==n)
		s += (press(s+all[0])==n) ? all[0] : all[1];
	else s += all[2];
	return s;
}

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