Submission #250495

#	Time	Username	Problem	Language	Result	Execution time	Memory
250495		parsa_mobed	Selling RNA Strands (JOI16_selling_rna)	C++14	35 / 100	1169 ms	1048576 KiB

selling_rna

#include <bits/stdc++.h>

using namespace std;
const int N = 2e6 + 5;
int st[N], fn[N], timer;
string s[N];

void convert(string &s) {
    for (int i = 0; i < (int)s.size(); i++) {
        if (s[i] == 'A') s[i] = 0;
        if (s[i] == 'G') s[i] = 1;
        if (s[i] == 'C') s[i] = 2;
        if (s[i] == 'U') s[i] = 3;
    }
    return ;
}
struct Trie {
    vector <int*> vec = {new int[5]{}};
    inline int* operator [] (int i) {return vec[i];}
    inline void add(string s) {
        int cur = 0;
        for (int i = 0; i < (int)s.size(); i++) {
            if (!vec[cur][(int)s[i]]) vec[cur][(int)s[i]] = vec.size(), vec.push_back(new int[5]{});;
            cur = vec[cur][(int)s[i]];
            vec[cur][4]++;
        }
        return ;
    }
    inline int get(string s) {
        int cur = 0;
        for (int i = 0; i < (int)s.size(); i++) {
            if (!vec[cur][(int)s[i]]) return 0;
            cur = vec[cur][(int)s[i]];
        }
        return cur;
    }
    inline int count(string s) {return vec[get(s)][4];}
} T, seg[N<<2];

void dfs(int v) {
    st[v] = timer++;
    for (int i = 0; i < 4; i++) if (T[v][i]) dfs(T[v][i]);
    fn[v] = timer;
}

void Add(const int &l, const string &s, int L = 0, int R = timer, int id = 1) {
    seg[id].add(s);
    if (R - L == 1) return ;
    int mid = (L+R)>>1;
    if (l < mid) Add(l, s, L, mid, id<<1);
    else Add(l, s, mid, R, id<<1|1);
    return ;
}
int Get(const int &l, const int &r, const string &s, int L = 0, int R = timer, int id = 1) {
    if (r <= L || R <= l) return 0;
    if (l <= L && R <= r) return seg[id].count(s);
    int mid = (L+R)>>1;
    return Get(l, r, s, L, mid, id<<1) + Get(l, r, s, mid, R, id<<1|1);
}

int main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int n, m; cin >> n >> m;
    for (int i = 0; i < n; i++) cin >> s[i], convert(s[i]), T.add(s[i]);
    dfs(0);
    for (int i = 0; i < n; i++) {
        int v = T.get(s[i]);
        reverse(s[i].begin(), s[i].end());
        Add(st[v], s[i]);
    }
    for (int i = 0; i < m; i++){
        string p, q; cin >> p >> q, convert(p), convert(q);
        int v = T.get(p);
        if (v == 0) {cout << 0 << "\n"; continue ;}
        reverse(q.begin(), q.end());
        cout << Get(st[v], fn[v], q) << "\n";
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 25
• Subtask 3: 25 / 25
• Subtask 4: 0 / 40