Submission #903914

#	Time	Username	Problem	Language	Result	Execution time	Memory
903914		zhasyn	Combo (IOI18_combo)	C++14	5 / 100	1 ms	496 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define pb push_back
#define pf push_front
using namespace std;
#define F first
#define S second
typedef long long ll;
#define pii pair <int, int>
#define pll pair <ll, ll>
typedef long double ld;
const ll N = 2 * 1e5 + 10, len = 316;
const ll mod = 1e9 + 7;

ll um(ll a, ll b){
	return ((1LL * a * b) % mod + mod) % mod;
}
ll subr(ll a, ll b){
	return ((1LL * a - b) % mod + mod) % mod;
}
string guess_sequence(int n){
	int fir, n1, n2, n3;
	string s = "ABXY";
	n1 = n2 = n3 = -1;
	if(press("AB") >= 1){
		if(press("A") == 1) fir = 0;
		else fir = 1;
	} else{
		if(press("X") == 1) fir = 2;
		else fir = 3;
	}
	string ans = "";
	ans += s[fir];
	for(int i = 0; i < 4; i++){
		if(i == fir) continue;
		if(n1 == -1) n1 = i;
		else{
			if(n2 == -1) n2 = i;
			else n3 = i;
		}
	}
	for(int i = 1; i < n - 1; i++){
		string check = ans + s[n1] + ans + s[n2] + s[n1];
		check = check + ans + s[n2] + s[n2] + ans + s[n2] + s[n3];
		int res = press(check);
		if(res == i + 1) ans += s[n1];
		else{
			if(res == i + 2) ans += s[n2];
			else ans += s[n3];
		}
	}
	if(press(ans + s[n1]) == n) ans += s[n1];
	else{
		if(press(ans + s[n2]) == n) ans += s[n2];
		else ans += s[n3];
	}
	return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95