Submission #927249

#	Time	Username	Problem	Language	Result	Execution time	Memory
927249		quanlt206	Combo (IOI18_combo)	C++17	100 / 100	15 ms	1948 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
#define X first
#define Y second
#define all(x) begin(x), end(x)
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define FORD(i, b, a) for(int i = (b); i >= (a); i--)
#define REP(i, a, b) for (int i = (a); i < (b); i++)
#define mxx max_element
#define mnn min_element
#define SQR(x) (1LL * (x) * (x))
#define MASK(i) (1LL << (i))
#define Point Vector
#define left Left
#define right Right
#define div Div

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;
typedef pair<db, db> pdb;
typedef pair<ld, ld> pld;
typedef pair<int, int> pii;
typedef pair<int, pii> piii;
typedef pair<ll, ll> pll;
typedef pair<ll, pll> plll;
typedef pair<ll, int> pli;
typedef pair<ll, pii> plii;

template<class A, class B>
    bool maximize(A& x, B y) {
        if (x < y) return x = y, true; else return false;
    }
template<class A, class B>
    bool minimize(A& x, B y) {
        if (x > y) return x = y, true; else return false;
    }
/* END OF TEMPLATE */

string guess_sequence(int n) {
    // guess the first
    string res = "";
    if (press("AB") > 0) {
        if (press("A") > 0) res+="A"; else res+="B";
    }
    else {
        if (press("X") > 0) res+="X"; else res+="Y";
    }
    vector<char> tmp;
    if ('A' != res[0]) tmp.push_back('A');
    if ('B' != res[0]) tmp.push_back('B');
    if ('X' != res[0]) tmp.push_back('X');
    if ('Y' != res[0]) tmp.push_back('Y');
    FOR(i, 2, n) {
        if (i == n) {
            int cnt = 0;
            for (auto x : tmp) {
                cnt++;
                if (cnt == 3) break;
                if (press(res + x) == i) {
                    res+=x;
                    break;
                }
            }
            if (cnt == 3) res+=tmp.back();
        }
        else {
            string ans = "";
            REP(i, 0, 3) ans+=res + tmp[0] + tmp[i];
            ans+=res + tmp[1];
            int t = press(ans);
            if (t == (int)res.size()) res+=tmp[2]; else
            if (t == (int)res.size() + 1) res+=tmp[1]; else res+=tmp[0];
        }
//        cerr<<"find : "<<res<<endl;
    }
    return res;
}

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