Submission #349656

#	Time	Username	Problem	Language	Result	Execution time	Memory
349656		spike1236	Combo (IOI18_combo)	C++14	100 / 100	39 ms	572 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define ll long long
#define ld long double
#define all(_v) _v.begin(), _v.end()
#define sz(_v) (int)_v.size()
#define pii pair <int, int>
#define pll pair <ll, ll>
#define veci vector <int>
#define vecll vector <ll>


bool check(char x) {
    string s = "";
    s += x;
    int cnt = press(s);
    if(cnt > 1 || !cnt) return 0;
    return 1;
}

string guess_sequence(int n) {
    string cur = "";
    set <char> st;
    st.insert('A');
    st.insert('B');
    st.insert('X');
    st.insert('Y');
    if(press("AB")) {
        if(press("B")) cur = "B", st.erase('B');
        else cur = "A", st.erase('A');
    } else if(press("X")) cur = "X", st.erase('X');
    else cur = "Y", st.erase('Y');
    auto it = st.begin();
    char a1, a2, a3;
    a1 = *it;
    ++it;
    a2 = *it;
    ++it;
    a3 = *it;
    for(int i = 1; i < n; ++i) {
        if(i == n - 1) {
            if(press(cur + a1) == n) cur += a1;
            else if(press(cur + a2) == n) cur += a2;
            else cur += a3;
        } else {
            int res = press(cur + a1 + cur + a2 + a1 + cur + a2 + a2 + cur + a2 + a3);
            if(res == i) cur += a3;
            else if(res == i + 1) cur += a1;
            else if(res == i + 2) cur += a2;
        }
    }
    return cur;
}

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