Submission #947446

#	Time	Username	Problem	Language	Result	Execution time	Memory
947446		GrandTiger1729	Selling RNA Strands (JOI16_selling_rna)	C++17	100 / 100	124 ms	94952 KiB

selling_rna

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

inline void convert(string &s)
{
    int n = s.size();
    for (int i = 0; i < n; i++)
    {
        if (s[i] == 'G')
        {
            s[i] = 'B';
        }
        if (s[i] == 'U')
        {
            s[i] = 'D';
        }
    }
}
const int K = 4;
struct Trie
{
    struct Node
    {
        int cnt = 0;
        Node *ch[K]{};
    };
    Node *rt = new Node();
    void add(const string &s)
    {
        Node *cur = rt;
        int n = s.size();
        for (int i = 0; i < n; i++)
        {
            if (cur->ch[s[i] - 'A'] == nullptr)
            {
                cur->ch[s[i] - 'A'] = new Node();
            }
            cur = cur->ch[s[i] - 'A'];
            cur->cnt++;
        }
    }
    int query(const string &s)
    {
        Node *cur = rt;
        int n = s.size();
        for (int i = 0; i < n; i++)
        {
            if (cur->ch[s[i] - 'A'] == nullptr)
            {
                return 0;
            }
            cur = cur->ch[s[i] - 'A'];
        }
        return cur->cnt;
    }
};

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    int n, q;
    cin >> n >> q;
    vector<string> a(n);
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
        convert(a[i]);
    }
    sort(a.begin(), a.end());
    vector<string> b(q);
    vector<vector<int>> ll(n + 1), rr(n + 1);
    for (int i = 0; i < q; i++)
    {
        string s;
        cin >> s >> b[i];
        convert(s);
        convert(b[i]);
        reverse(b[i].begin(), b[i].end());
        int l = lower_bound(a.begin(), a.end(), s) - a.begin();
        s.back()++;
        int r = lower_bound(a.begin(), a.end(), s) - a.begin();
        ll[l].push_back(i);
        rr[r].push_back(i);
    }
    Trie tr;
    vector<int> ans(q);
    for (int t = 0; t <= n; t++)
    {
        for (auto id : rr[t])
        {
            ans[id] += tr.query(b[id]);
        }
        for (auto id : ll[t])
        {
            ans[id] -= tr.query(b[id]);
        }
        if (t < n)
        {
            reverse(a[t].begin(), a[t].end());
            tr.add(a[t]);
        }
    }
    for (int i = 0; i < q; i++)
    {
        cout << ans[i] << '\n';
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40