Submission #349172

#	Time	Username	Problem	Language	Result	Execution time	Memory
349172		zggf	Combo (IOI18_combo)	C++14	100 / 100	66 ms	552 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

string guess_sequence(int N) {

	char firstLetter='X';
	if(press("XY")){
		if(press("X")) firstLetter = 'X';
		else firstLetter = 'Y';
	}else{
		if(press("A")) firstLetter = 'A';
		else firstLetter = 'B';
	}

	string wyn = "";
	wyn.push_back(firstLetter);
	for(int i = 1; i < N-1; i++){
		if(firstLetter=='A'){
			int tmp = press(wyn+"X"+wyn+"YX"+wyn+"YB"+wyn+"YY");
			if(tmp==(int)wyn.size()){
				wyn.push_back('B');	
			}else if(tmp==(int)wyn.size()+1){
				wyn.push_back('X');	
			}else wyn.push_back('Y');
		}
		if(firstLetter=='B'){
			int tmp = press(wyn+"X"+wyn+"YX"+wyn+"YA"+wyn+"YY");
			if(tmp==(int)wyn.size()){
				wyn.push_back('A');	
			}else if(tmp==(int)wyn.size()+1){
				wyn.push_back('X');	
			}else wyn.push_back('Y');
		}
		if(firstLetter=='X'){
			int tmp = press(wyn+"B"+wyn+"YB"+wyn+"YA"+wyn+"YY");
			if(tmp==(int)wyn.size()){
				wyn.push_back('A');	
			}else if(tmp==(int)wyn.size()+1){
				wyn.push_back('B');	
			}else wyn.push_back('Y');
		}
		if(firstLetter=='Y'){
			int tmp = press(wyn+"B"+wyn+"XB"+wyn+"XA"+wyn+"XX");
			if(tmp==(int)wyn.size()){
				wyn.push_back('A');	
			}else if(tmp==(int)wyn.size()+1){
				wyn.push_back('B');	
			}else wyn.push_back('X');
		}
	}

	if(N>1){
		char lastLetter;
		if(firstLetter=='A'){
			int tmp = press(wyn+"X"+wyn+"Y");
			if(tmp==N){
				tmp = press(wyn+"X");
				if(tmp==N){
					lastLetter = 'X';
				}else lastLetter = 'Y';
			}else{
				lastLetter='B';	
			}
		}
		if(firstLetter=='B'){
			int tmp = press(wyn+"X"+wyn+"Y");
			if(tmp==N){
				tmp = press(wyn+"X");
				if(tmp==N){
					lastLetter = 'X';
				}else lastLetter = 'Y';
			}else{
				lastLetter='A';	
			}
		}
		if(firstLetter=='X'){
			int tmp = press(wyn+"A"+wyn+"Y");
			if(tmp==N){
				tmp = press(wyn+"A");
				if(tmp==N){
					lastLetter = 'A';
				}else lastLetter = 'Y';
			}else{
				lastLetter='B';	
			}
		}
		if(firstLetter=='Y'){
			int tmp = press(wyn+"A"+wyn+"X");
			if(tmp==N){
				tmp = press(wyn+"A");
				if(tmp==N){
					lastLetter = 'A';
				}else lastLetter = 'X';
			}else{
				lastLetter='B';	
			}
		}
		wyn.push_back(lastLetter);
	}
	return wyn;
}

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