Submission #1183514

#	Time	Username	Problem	Language	Result	Execution time	Memory
1183514		countless	Crayfish scrivener (IOI12_scrivener)	C++20	12 / 100	1097 ms	57720 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;

const ll MOD = 998244353;
const ll INF = 1e18;
const ld EPS = 1e-12;

#define endl "\n"
#define sp <<" "<<
#define REP(i, a, b) for(ll i = a; i < b; i++)
#define dbg(x) cout << #x << " = " << x << endl
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define fast_io() ios_base::sync_with_stdio(false); cin.tie(NULL)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((ll)(x).size())

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        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);
    }
};

template <typename Key, typename Value>
using hash_map = unordered_map<Key, Value, custom_hash>;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// uniform_int_distribution<int>(a, b)(rng);
// shuffle(all(a), rng);

const int MAXY = 26;

int curr;
string s;

struct trie {
    int next[MAXY];
    bool output = false;

    trie() {
        fill(begin(next), end(next), -1);
    }
};

vector<trie> t(1);
vector<int> up(1);

void Init() {
    s = "";
    curr = 0;
    // t[0].output = true;
    // up[0] = -1;
}

void TypeLetter(char L) {
    int x = L - 'a';
    if (t[curr].next[x] == -1) {
        t[curr].next[x] = t.size();
        t.emplace_back();
        up.push_back(curr);
        // cerr << curr << endl;
    }

    curr = t[curr].next[x];

    t[curr].output = true;
}

void UndoCommands(int U) {
    for (int i = 0; i < U; i++) {
        if (up[curr] == 0)
            break;
        t[curr].output = false;
        // cerr << curr sp t.size() sp up.size() sp up[curr] << endl;
        curr = up[curr];
    }
}

char GetLetter(int P) {
    int timer = -1;
    int x = 0, out;
    while (timer != P) {
        for (int i = 0; i < MAXY; i++) {
            if (t[t[x].next[i]].output == true) {
                x = t[x].next[i];
                out = i;
                timer++;
                break;
            }
        }
    }

    return out + 'a';
}

// int main() {
//     Init();

//     int n; cin >> n;
//     char command;
//     REP(i, 0, n) {
//         cin >> command;

//         if (command == 'T') {
//             char c; cin >> c;
//             TypeLetter(c);
//         }
        
//         else if (command == 'U') {
//             int x; cin >> x;
//             UndoCommands(x);
//         }

//         else {
//             int x; cin >> x;
//             cout << GetLetter(x) << endl;
//         }
//     }
// }

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 0 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40