Submission #548737

#	Time	Username	Problem	Language	Result	Execution time	Memory
548737		cpp219	Combo (IOI18_combo)	C++17	100 / 100	30 ms	592 KiB

combo

#include<bits/stdc++.h>
#include<combo.h>
#define ll int
#define ld long double
#define fs first
#define sc second
#define debug(y) cout<<y,exit(0)
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 3e5 + 9;
const ll inf = 1e9 + 7;

string p = "ABXY";

string guess_sequence(int n) {
    int x;
	string s;
	char ch[4]= {'A', 'B', 'X', 'Y'};
	if (press("AB") >= 1) x = press("A") != 1;
	else x = 2 + (press("X") < 1);
	s += ch[x];
	if (n == 1) return s;
	swap(ch[x], ch[3]);
	for (int i = 1; i < n - 1; i++) {
		x = press(s + ch[0] + ch[0] + s + ch[0] + ch[1] + s + ch[0] + ch[2] + s + ch[1]);
		if (x == i + 2) s += ch[0];
		else if (x == i + 1) s += ch[1];
		else s += ch[2];
	}
	if (press(s + ch[0] + s + ch[1]) == n) {
		if (press(s + ch[0]) == n) s += ch[0];
		else s += ch[1];
	}
	else s += ch[2];
	return s;
}
/*
int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        //freopen(task".out","w",stdout);
    }

}
/// be confident
*/

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