Submission #1129450

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129450		vladilius	Selling RNA Strands (JOI16_selling_rna)	C++20	100 / 100	450 ms	171100 KiB

selling_rna

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
const int base = 73;

struct TR{
    struct node{
        int nt[5], f;
    };
    vector<node> t;
    vector<char> C;
    int cc, S;
    void init(){
        t.pb(node());
        t.pb(node());
        C = {'J', 'A', 'C', 'G', 'U'};
        cc = 1;
        S = 0;
    }
    int f(char x){
        if (x == 'A') return 1;
        if (x == 'C') return 2;
        if (x == 'G') return 3;
        return 4;
    }
    void add(string s){
        int v = 1;
        for (char x: s){
            int y = f(x);
            if (!t[v].nt[y]){
                t[v].nt[y] = ++cc;
                t.pb(node());
            }
            v = t[v].nt[y];
        }
        t[v].f++;
        S += (int) s.size();
    }
    vector<int> tin, tout;
    vector<pair<ull, int>> all;
    int timer;
    string s;
    void dfs(int v){
        tin[v] = ++timer;
        if (t[v].f){
            ull h = 0, b = 1;
            for (int i = (int) s.size() - 1; i >= 0; i--){
                h += b * f(s[i]);
                b *= base;
                for (int j = 0; j < t[v].f; j++){
                    all.pb({h, tin[v]});
                }
            }
        }
        for (int i = 1; i < 5; i++){
            int y = t[v].nt[i];
            if (!y) continue;
            s += C[i];
            dfs(y);
            s.pop_back();
        }
        tout[v] = timer;
    }
    vector<vector<int>> mp;
    vector<ull> ii;
    void build(){
        s = "";
        timer = 0;
        tin.resize(S + 1);
        tout.resize(S + 1);
        dfs(1);
        
        sort(all.begin(), all.end());
        int i = 0;
        while (i < all.size()){
            mp.pb({});
            ii.pb(all[i].ff);
            int j = i;
            while (j < all.size() && all[i].ff == all[j].ff){
                mp.back().pb(all[j].ss);
                j++;
            }
            i = j;
        }
    }
    vector<ull> :: iterator it;
    vector<int> :: iterator it1, it2;
    int get(string p, string q){
        int v = 1;
        for (char x: p){
            int y = t[v].nt[f(x)];
            if (!y) return 0;
            v = y;
        }
        
        int l = tin[v], r = tout[v];
        ull h = 0, b = 1;
        for (int i = (int) q.size() - 1; i >= 0; i--){
            h += b * f(q[i]);
            b *= base;
        }
        
        it = lower_bound(ii.begin(), ii.end(), h);
        int j = (int) (it - ii.begin());
        
        it1 = lower_bound(mp[j].begin(), mp[j].end(), l);
        it2 = upper_bound(mp[j].begin(), mp[j].end(), r);
        return (int) (it2 - it1);
    }
};

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, q; cin>>n>>q;
    TR T; T.init();
    while (n--){
        string s; cin>>s;
        T.add(s);
    }
    T.build();
    while (q--){
        string p, q; cin>>p>>q;
        cout<<T.get(p, q)<<"\n";
    }
}

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