Cod sursa(job #3274711)

Utilizator bostanlucastefanBostan Luca-Stefan bostanlucastefan Data 8 februarie 2025 10:25:50
Problema Trie Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.65 kb
#include <fstream>
#define FAST ios_base::sync_with_stdio(false);

using namespace std;

ifstream cin("trie.in");
ofstream cout("trie.out");

class Trie
{
    int cnt=0;
    int lvs=0;
    Trie *next[26]={};
    
    public:
    
        void insert(const string& str, int pos = 0) {
        lvs++;
        if (pos == int(str.size()))
            cnt++;
        else {
            if (!next[str[pos] - 'a'])
                next[str[pos] - 'a'] = new Trie;
            next[str[pos] - 'a']->insert(str, pos + 1);
        }
    }

    void erase(const string& str, int pos = 0) {
        lvs--;
        if (pos == int(str.size()))
            cnt--;
        else {
            next[str[pos] - 'a']->erase(str, pos + 1);
            if (!next[str[pos] - 'a']->lvs) {
                delete next[str[pos] - 'a'];
                next[str[pos] - 'a'] = nullptr;
            }
        }
    }

    int count(const string& str, int pos = 0) {
        if (pos == int(str.size()))
            return cnt;
        if (!next[str[pos] - 'a'])
            return 0;
        return next[str[pos] - 'a']->count(str, pos + 1);
    }

    int lcp(const string& str, int pos = 0) {
        if (pos == int(str.size()))
            return 0;
        if (!next[str[pos] - 'a'])
            return 0;
        return 1 + next[str[pos] - 'a']->lcp(str, pos + 1);
    }
};

int main()
{
    FAST
    Trie trie;
    int tip; string s;
    while(cin>>tip>>s)
    {
        switch(tip)
        {
            case 0: trie.insert(s); break;
            case 1: trie.erase(s); break;
            case 2: cout<<trie.count(s)<<'\n'; break;
            case 3: cout<<trie.lcp(s)<<'\n'; break;
        }
    }
    return 0;
}