Submission #778667

#	Time	Username	Problem	Language	Result	Execution time	Memory
778667		Silence	Combo (IOI18_combo)	C++17	30 / 100	48 ms	820 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
std::string guess_sequence(int N) {
	string s;
	string ans;
	auto third_subtask = [&](int n){
		string cur = "ABXY";
		string s;
		string ans;
		for (int i = 0;i<3;++i){
			string t;
			t+=cur[i];
			if (press(t) == 1){
				for (int j = 0;j<4;++j){
					if (i == j)continue;
					s+=cur[j];
				}
				ans+=cur[i];
				break;
			}
		}
		if (ans.empty()){
			ans+=cur[3];
			for (int j = 0;j<3;++j){
				s+=cur[j];
			}
		}
		if (n == 1)return ans;
		//n + 1 + n + 2
		for (int i = 0;i<n - 2;++i){
			string p = ans;
			p+=s[0];
			for (int j = 0;j<3;++j){
				string t = ans;
				t+=s[1];
				t+=s[j];
				p+=t;        
			}
			if (press(p) == i + 2){
				ans+=s[0];
			}	
			else if (press(p) == i + 1){
				ans+=s[2];
			}
			else{
				ans+=s[1];
			}
		}
		for (int i = 0;i<2;++i){
			ans+=s[i];
			if (press(ans) == n){
				return ans;
			}
			ans.pop_back();
		}
		ans+=s[2];
		return ans;	
	};
	string v = third_subtask(N);
	//cout<<v<<'\n';
	return v;  
}

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95