Submission #290570

#	Time	Username	Problem	Language	Result	Execution time	Memory
290570		gabrc52	Combo (IOI18_combo)	C++14	30 / 100	65 ms	544 KiB

combo

#include <iostream>
#include <string>
#define watch(x) cerr<<#x<<": "<<(x)<<endl
#include "combo.h"

using namespace std;

char getFirst() {
	if (press("AB") >= 1) {
		return press("A")==1 ? 'A' : 'B';
	} else {
		return press("X")==1 ? 'X' : 'Y';
	}
}

string valid = "ABXY";

string newValid(string s, char first) {
	string r;
	for (char c : s) {
		if (c != first) {
			r.push_back(c);
		}
	}
	return r;
}

int sz(string s) {
	return s.size();
}

string guess_sequence(int N) {
	string p,S;
	char first = getFirst();
	S.push_back(first);
	watch(first);
	valid = newValid(valid,first);
	watch(valid);
	for (int i=2; i<=N; i++) {
		if (press(S+valid[0]+S+valid[1]) == sz(S)) {
			S.push_back(valid[2]);
		} else if (press(S+valid[0]) == sz(S)) {
			S.push_back(valid[1]);
		} else {
			S.push_back(valid[0]);
		}
	}
	watch(S);
	return S;
}

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