Submission #691780

#	Time	Username	Problem	Language	Result	Execution time	Memory
691780		danikoynov	Selling RNA Strands (JOI16_selling_rna)	C++14	100 / 100	663 ms	710828 KiB

selling_rna

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const int maxn = 1e5 + 10, alphabet = 26;

int n, m;
string rna[maxn];

struct query
{
    string p, q;
}ask[maxn];

void input()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i ++)
        cin >> rna[i];
    for (int i = 1; i <= m; i ++)
        cin >> ask[i].p >> ask[i].q;
    sort(rna + 1, rna + n + 1);
}

struct trie
{
    trie *child[alphabet];
    int left, right;
    vector < int > bucket;

    trie()
    {
        for (int i = 0; i < alphabet; i ++)
            child[i] = NULL;
        left = 1e9;
        right = 0;
    }
};

void add(trie *root, string &word, int pos, int idx)
{
     root -> left = min(root -> left, idx);
    root -> right = max(root -> right, idx);
    root -> bucket.push_back(idx);
    if (pos == word.size())
        return;

    int go = word[pos] - 'A';
    if (root -> child[go] == NULL)
        root -> child[go] = new trie();

    add(root -> child[go], word, pos + 1, idx);
}

trie *ft = new trie(), *bk = new trie();

void build_trie()
{
    for (int i = 1; i <= n; i ++)
    {
        add(ft, rna[i], 0, i);
        reverse(rna[i].begin(), rna[i].end());
        add(bk, rna[i], 0, i);
    }
}

pair < int, int > query_range(trie *root, string &word, int pos)
{
    if (pos == word.size())
    return make_pair(root -> left, root -> right);

    int go = word[pos] - 'A';
    if (root -> child[go] == NULL)
        return make_pair(1e9, 0);

    return query_range(root -> child[go], word, pos + 1);
}

int calculate(vector < int > &bucket, pair < int, int > range)
{
    int lf = 0, rf = (int)(bucket.size()) - 1;
    while(lf <= rf)
    {
        int mf = (lf + rf) / 2;
        if (bucket[mf] < range.first)
            lf = mf + 1;
        else
            rf = mf - 1;
    }

    int f1 = lf;

    lf = 0;
    rf = (int)(bucket.size()) - 1;
    while(lf <= rf)
    {
        int mf = (lf + rf) / 2;
        if (bucket[mf] <= range.second)
            lf = mf + 1;
        else
            rf = mf - 1;
    }

    int f2 = rf;

    return max(0, f2 - f1 + 1);
}

int query(trie *root, string &word, int pos, pair < int, int > &range)
{
    if (pos == word.size())
    {
        return calculate(root -> bucket, range);
    }

    int go = word[pos] - 'A';
    ///cout << go << endl;
    if (root -> child[go] == NULL)
        return 0;

    return query(root -> child[go], word, pos + 1, range);

}
void solve_queries()
{
    for (int i = 1; i <= m; i ++)
    {
        pair < int, int > range = query_range(ft, ask[i].p, 0);
        reverse(ask[i].q.begin(), ask[i].q.end());
        int ans = query(bk, ask[i].q, 0, range);
        ///cout << range.first << " " << range.second << endl;
        cout << ans << endl;
    }
}

void solve()
{
    input();
    build_trie();
    solve_queries();
}

int main()
{
    speed();
    solve();
    return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'void add(trie*, std::string&, int, int)':
selling_rna.cpp:54:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     if (pos == word.size())
      |         ~~~~^~~~~~~~~~~~~~
selling_rna.cpp: In function 'std::pair<int, int> query_range(trie*, std::string&, int)':
selling_rna.cpp:78:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     if (pos == word.size())
      |         ~~~~^~~~~~~~~~~~~~
selling_rna.cpp: In function 'int query(trie*, std::string&, int, std::pair<int, int>&)':
selling_rna.cpp:120:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |     if (pos == word.size())
      |         ~~~~^~~~~~~~~~~~~~

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