Submission #1161929

#	Time	Username	Problem	Language	Result	Execution time	Memory
1161929		tsengang	Combo (IOI18_combo)	C++20	5 / 100	0 ms	408 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
#define ll long long
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define ertunt return
const int mod = 998244353;
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
string guess_sequence(int n){
    string s = "";
    vector<char> chr = {'A', 'B', 'X', 'Y'};
    if(press("AB") > 0){
        if(press("A") > 0){
            s += 'A';
            chr.erase(find(all(chr), 'A'));
        }
        else{
            s += 'B';
            chr.erase(find(all(chr), 'B'));
        }
    }
    else{
        if(press("X") > 0){
            s += 'X';
            chr.erase(find(all(chr), 'X'));
        }
        else{
            s += 'Y';
            chr.erase(find(all(chr), 'Y'));
        }
    }
    for(int i = 1; i < n - 1; i++){
        string t = s + chr[0] + s + chr[1] + chr[0] + s + chr[1] + chr[2] + s + chr[1] + chr[1];
        int x = press(t);
        if(x == i + 1){
            s += chr[0];
        }
        else if(x == i + 2){
            s += chr[1];
        }
        else{
            s += chr[2];
        }
    }
    if(press(s + chr[0]) == n){
        s += chr[0];
    }
    else if(press(s + chr[1]) == n){
        s += chr[1];
    }
    else{
        s += chr[2];
    }
    ertunt s;
}

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