Submission #75472

#	Time	Username	Problem	Language	Result	Execution time	Memory
75472		sevenkplus	Combo (IOI18_combo)	C++14	100 / 100	62 ms	640 KiB

combo

#include "combo.h"

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> PII;

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define pct __builtin_popcount

#define INF 1000000007

std::string guess_sequence(int N) {
	string p = "";
	if (press("AB")) {
		if (press("A")) p = "A";
		else p = "B";
	} else {
		if (press("X")) p = "X";
		else p = "Y";
	}
	if (N == 1) return p;
	string s = "";
	for (char c : "ABXY")
		if (p[0] != c) s += c;
	for (int i = 1; i < N-1; i ++) {
		int c = press(p+s[0]+s[0] + p+s[0]+s[1] + p+s[0]+s[2] + p+s[1]);
		if (c == i+2) p += s[0];
		if (c == i+1) p += s[1];
		if (c == i) p += s[2];
	}
	if (press(p+s[0]) == N) p += s[0]; else
	if (press(p+s[1]) == N) p += s[1];
	else p += s[2];
	return p;
}

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