Submission #84837

#	Time	Username	Problem	Language	Result	Execution time	Memory
84837		SirCeness	Combo (IOI18_combo)	C++14	100 / 100	74 ms	616 KiB

combo

#include "combo.h"
#include <iostream>

std::string guess_sequence(int N) {
	
	std::string head = "";
	std::string str = "";
	str = "AB";
	char lead;
	if (press(str)){
		str = "A";
		if (press(str)){
			head = "A";
			lead = 'A';
	 	} else {
			head = "B";
			lead  = 'B';
		}
	} else {
		str = "X";
		if (press(str)){
			head = "X";
			lead = 'X';
		} else {
			head = "Y";
			lead = 'Y';
		}
		
	}
	
	std::string a, b, c;
	if (lead == 'A'){
		a = "B";
		b = "X";
		c = "Y";
	} else if (lead == 'B'){
		a = "A";
		b = "X";
		c = "Y";
	} else if (lead == 'X'){
		a = "B";
		b = "A";
		c = "Y";
	} else if (lead == 'Y'){
		a = "B";
		b = "X";
		c = "A";
	} else std::cout << "FATAL_ERROR1_";
	
	for (int i = 1; i < N-1; i++){
		/*str = "";
		str += head;
		str += a;
		str += a;
		str += head;
		str += a;
		str += b;
		str += head;
		str += a;
		str += c;
		str += head;
		str += b;*/
		
		str = head + a + a + head + a + b + head + a + c + head + b;
		
		int coins = press(str);
		if (coins == i+2) head += a;
		else if (coins == i+1) head += b;
		else if (coins == i) head += c;
		else std::cout << "FATAL_ERROR2_";
		
	}
	
	/*str = "";
	str += head;
	str += a;
	str += head;
	str += b;*/
	
	if (N == 1) return head;
	
	str = head + a + head + b;
	
	int coin = press(str);
	if (coin == N-1){
		head += c;
	} else if (coin == N){
		str = head + a;
		coin = press(str);
		if (coin == N-1) head += b;
		else if (coin == N) head += a;
		else std::cout << "FATAL_ERROR4_";
	} else std::cout << "FATAL_ERROR3_";
	
	return head;
}

/*
	string p = "";
	for (int i = 0; i < 4 * N; ++i) {
		p += 'A';
	}
	int coins = press(p);
	string S = "";
	for (int i = 0; i < N; ++i) {
		S += 'A';
	}
	return S;
*/

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