Submission #1105811

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105811		magician	Combo (IOI18_combo)	C++17	30 / 100	44 ms	1104 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
#define MASK(i) (1ll << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define REP(i, a, b) for(int i = (a), _b = (b); i <= _b; ++i)
#define REPD(i, a, b) for(int i = (a), _b = (b); i >= _b; --i)
#define ALL(v) (v).begin(), (v).end()
#define SZ(v) (int)(v).size()
#define PATHWA "A"
#define fi first
#define se second
#define ll long long
using namespace std;
/*
int press(string p) {
    const string S = "ABXYY";
    int res = 0;
    REP(l, 1, SZ(S)) {
        REP(i, 0, SZ(p) - l) {
            if(S.substr(0, l) == p.substr(i, l)) {
                res = l;
                break;
            }
        }
    }

    return res;
}
*/
string guess_sequence(int N) {
    vector<char> a = {'A', 'B', 'X', 'Y'};

    string res, tmp;
    REP(i, 0, 2) {
        tmp.push_back(a[i]);
        if(press(tmp) == 1) {
            res.push_back(a[i]);
            break;
        }
        tmp.pop_back();
    }
    if(res.empty()) {
        res.push_back(a[3]);
        tmp.push_back(a[3]);
    }

    vector<char> b;
    REP(i, 0, 3) if(res[0] != a[i]) b.push_back(a[i]);

    tmp = res;
    REP(l, 2, N) {
        REP(i, 0, 1) {
            tmp.push_back(b[i]);
            if(press(tmp) == l) {
                res.push_back(b[i]);
                break;
            }
            tmp.pop_back();
        }
        if(SZ(res) < l) {
            res.push_back(b[2]);
            tmp.push_back(b[2]);
        }
    }

    return res;
}
/*
int main(void) {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if(fopen(PATHWA".INP", "r")) {
        freopen(PATHWA".INP", "r", stdin);
        freopen(PATHWA".OUT", "w", stdout);
    }

    return 0;
}
*/

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95