Searching string using Trie tree (Basic code of Trie tree)


 

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///
///Abul Hasnat  Tonmoy
///Department of CSE,23rd batch
///Islamic University,Bangladesh

#include <bits/stdc++.h>
using namespace std;
struct node
{
    bool mark=0;
    node* child[52]= {NULL};

};
node *root=new node;
int getld(char ch)
{
    int id=ch-'A';
    if(ch>='a')id-=6;
    return id;
}
void insert(string s)
{
    node *crnt=root;
    for(int i=0;i<s.size();i++)
    {
        int id=getld(s[i]);
        if(crnt->child[id]==NULL)
           crnt->child[id]=new node;
        crnt=crnt->child[id];
    }
    crnt->mark=1;
}
bool search (string &s)
{
    node *currentnode=root;
    for(int i=0;i<s.size();i++)
    {
       int id=getld(s[i]);
        if(currentnode->child[id]==NULL)
            return false;
        currentnode=currentnode->child[id];
    }
    return currentnode->mark;
}
int main()
{
    int n;
    string s,s1;
    cout<<" number of string given : "<<endl;
    cin>>n;
    for(int i=0; i<n; i++)
    {
        cin>>s;
        insert(s);
    }
    cout<<" Searching string  : "<<endl;
    cin>>s1;
    if(search(s1))
    {
        cout<<s1<<" found\n";
    }
    else
    {
        cout<<s1<<" not found\n";
    }
    return 0;
}

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