Revise paste Trie

#include <bits/stdc++.h>
#define fastread() ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL)
#define nl "\n"
#define ll long long
#define all(x) x.begin(), x.end()
#define Unique(x) x.resize(distance(x.begin(),unique(all(x))));
#define ff first
#define ss second
using namespace std;
#define int long long
const int N=2e5+7,M=1e9+7;
struct vertex{
    int pre,flag,child[26];
    vertex(){
        pre=flag=0;
        for (int i=0;i<26;i++) child[i]=-1;
    }
};
vector<vertex>Trie;
int avail;
void insert(string &s){
    int cur=0;
    Trie[cur].pre++;
    for (int i=0;i<s.size();i++){
        int x=s[i]-'a';
        if (Trie[cur].child[x]==-1){
            Trie[cur].child[x]=avail;
            if (Trie.size()<=avail) Trie.push_back(vertex());
            else Trie[avail]=vertex();
            avail++;
        }
        cur=Trie[cur].child[x];
        Trie[cur].pre++;
    }
    Trie[cur].flag++;
}
int query(string &s){
    int cur=0;
    for (int i=0;i<s.size();i++){
        int x=s[i]-'a';
        if (Trie[cur].child[x]==-1) return 0;
        cur=Trie[cur].child[x];
    }
    return Trie[cur].pre;
}
bool remove(int cur,string &s,int i){
    if (i!=s.size()){
        int x=s[i]-'a';
        bool deleted=remove(Trie[cur].child[x],s,i+1);
        if (deleted) Trie[cur].child[x]=-1;
    }
    else Trie[cur].flag--;
    if (cur){
        Trie[cur].pre--;
        if (Trie[cur].pre==0){
            Trie[cur]=vertex();
            return 1;
        }
    }
    return 0;
}
void solve(int tc){
    avail=1;
    if (Trie.size()) Trie[0]=vertex();
    else Trie.push_back(vertex());

// remove er time e
    // remove(0,s,0);

}
signed main(){
    fastread();
    int T=1;//cin>>T;
    for (int i=1;i<=T;i++) solve(i);
}