Submission #316674

#	Time	Username	Problem	Language	Result	Execution time	Memory
316674		anakib1	Combo (IOI18_combo)	C++17	100 / 100	48 ms	640 KiB

combo

#include "combo.h"
#include <iostream>
#include <cmath>
#include <algorithm>
#include <stdio.h>
#include <cstring>
#include <string>
#include <cstdlib>
#include <vector>
#include <bitset>
#include <map>
#include <chrono>
#include <functional>
#include <unordered_set>
#include <unordered_map>
#include <numeric>
#include <queue>
#include <ctime>
#include <stack>
#include <set>
#include <list>
#include <deque>
#include <iomanip>
#include <sstream>
#include <fstream>
#include <stdarg.h>
#include <utility>
#include "combo.h"

using namespace std;

#define pb push_back
#define mp make_pair
#define ll long long
#define ull unisgned long long
#define ld long double
#define all(a) a.begin(), a.end()
#define SORT(a) sort(all(a))
#define pii pair<int, int>
#define tii triple<int, int, int>
#define e 1e-7
#define PI acos(-1)
#define sz(a) (int)(a.size())
#define inf 1e17
#define vi vector<int>
#define F first
#define S second
#define rng(x) for(int _ = 0; _ < (x); _++)
#define rngi(i, x) for(int i = 0; i < (x); i++)
#define rngsi(s, i, x) for(int i = (s); i <(x); i++)
#define problem "a"

template<typename A, typename B, typename C>
struct triple {
    A X;
    B Y;
    C Z;
    triple(A a = 0, B b = 0, C c = 0) :X(a), Y(b), Z(c) {}
};
template<typename A, typename B, typename C>
triple<A, B, C> make_triple(A a = 0, B b = 0, C c = 0) {
    return triple<A, B, C>(a, b, c);
}
template<typename A, typename B, typename C>
bool operator<(const triple<A, B, C>& a, const triple<A, B, C>& b) {
    if (a.X != b.X)
        return a.X < b.X;
    if (a.Y != b.Y)
        return a.Y < b.Y;
    return a.Z < b.Z;
}
template<typename T, typename SS>
ostream& operator<<(ostream& ofs, const pair<T, SS>& p) {
    ofs << "( " << p.F << " , " << p.S << " )";
    return ofs;
}
template<typename T>
void print(T a) {
    for (auto i : a)
        cout << i << ' ';
    cout << '\n';
}
template<typename T>
T max(T a, T b, T c) {
    return max(a, max(b, c));
}
template<typename T>
T min(T a, T b, T c) {
    return min(a, min(b, c));
}
template<typename T, typename D>
D min(T a) {
    return *min_element(all(a));
}
template<typename T, typename D>
D max(T a) {
    return *max_element(all(a));
}
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

std::string guess_sequence(int n) {
    vector<char> id{ 'A', 'B','X','Y'};
    int f = 3;
    if (press(string(2 * n, id[0]) + string(2 * n, id[1]))) {
        if (press(string(1, id[0]))) f = 0; else f = 1;
    }
    else {
        if (press(string(1, id[2]))) f = 2; else f = 3;
    }
    string p = string(1, id[f]);
    if (n == 1) return p;
    rngi(i, n - 2) {
        string ask = p + string(1, id[(f + 1) % 4]) +
            p + string(1, id[(f + 2) % 4]) + string(1, id[(f + 1) % 4]) +
            p + string(1, id[(f + 2) % 4]) + string(1, id[(f + 2) % 4]) + 
            p + string(1, id[(f + 2) % 4]) + string(1, id[(f + 3) % 4]);
        int v = press(ask);
        if (v == sz(p)) p += string(1, id[(f + 3) % 4]);
        else if (v == sz(p) + 1) p += string(1, id[(f + 1) % 4]);
        else p += string(1, id[(f + 2) % 4]);
    }
    if (press(p + string(1, id[(f + 1) % 4])) == n) p += id[(f + 1) % 4];
    else if (press(p + string(1, id[(f + 2) % 4])) == n) p += id[(f + 2) % 4];
    else p += id[(f + 3) % 4];
    return p;
}

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