Submission #703117

#	Time	Username	Problem	Language	Result	Execution time	Memory
703117		PenguinsAreCute	Combo (IOI18_combo)	C++17	10 / 100	52 ms	552 KiB

combo

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

string guess_sequence(int N) {
	string p = ""; char c[4]; c[0] = 'A'; c[1] = 'B'; c[2] = 'X'; c[3] = 'Y';
	for(int j = 0; j < 4; j++) {
		if(j == 0) p += c[j];
		else p[0] = c[j];
		if(press(p) == 1) {
			if(j != 3) swap(c[j], c[3]);
			break;
		}
	}
	srand(52398339);
	for(int i = 1; i < N; i++) {
		int a = rand() % 3, b = rand() % 3;
		if(a != b) swap(c[a], c[b]);
		for(int j = 0; j < 3; j++) {
			if(j == 0) p += c[j];
			else p[i] = c[j];
			if(press(p) == i + 1) break;
		}
	}
	return p;
}

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