Submission #396861

#	Time	Username	Problem	Language	Result	Execution time	Memory
396861		Osama_Alkhodairy	Selling RNA Strands (JOI16_selling_rna)	C++17	100 / 100	469 ms	537524 KiB

selling_rna

#include <bits/stdc++.h>
using namespace std;
#define finish(x) return cout << x << endl, 0
#define ll long long

const int N = 2000001;

int n, m, trie[2][4 * N][4], cnt[2], mn[4 * N], mx[4 * N];
vector <int> f[4 * N];
vector <string> a;

int c(char c){
    if(c == 'A') return 0;
    if(c == 'G') return 1;
    if(c == 'C') return 2;
    if(c == 'U') return 3;
    assert(false);
}
void add(string &s, int idx, int tr){
    int cur = 0;
    for(auto &i : s){
        if(trie[tr][cur][c(i)] == -1){
            trie[tr][cur][c(i)] = ++cnt[tr];
        }
        cur = trie[tr][cur][c(i)];
        if(tr == 0){
            if(mn[cur] == -1) mn[cur] = idx;
            mx[cur] = idx;
        }
        else{
            f[cur].push_back(idx);
        }
    }
}
pair <int, int> query1(string &s){
    int cur = 0;
    for(auto &i : s){
        if(trie[0][cur][c(i)] == -1){
            return make_pair(-1, -1);
        }
        cur = trie[0][cur][c(i)];
    }
    return make_pair(mn[cur], mx[cur]);
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    memset(trie, -1, sizeof trie);
    memset(mn, -1, sizeof mn);
    cin >> n >> m;
    a.resize(n);
    for(auto &i : a) cin >> i;
    sort(a.begin(), a.end());
    for(int i = 0 ; i < n ; i++){
        add(a[i], i, 0);
        reverse(a[i].begin(), a[i].end());
        add(a[i], i, 1);
        reverse(a[i].begin(), a[i].end());
    }
    for(int i = 0 ; i < m ; i++){
        string l, r;
        cin >> l >> r;
        reverse(r.begin(), r.end());
        auto q1 = query1(l);
        int cur = 0;
        for(auto &i : r){
            if(trie[1][cur][c(i)] == -1){
                q1 = make_pair(-1, -1);
                break;
            }
            cur = trie[1][cur][c(i)];
        }
        if(q1.first == -1){
            cout << "0\n";
            continue;
        }
        auto &q2 = f[cur];
        cout << upper_bound(q2.begin(), q2.end(), q1.second) - lower_bound(q2.begin(), q2.end(), q1.first) << "\n";
    }
}

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