All about Trie Data Structure
// trei is a data structure which has an array and a leaf // array points to the next tries and leaf // tells whether this word ends or not. #include <bits/stdc++.h> using namespace std ; class Node { public: Node * arr[ 26 ]; bool leaf; Node (){ for ( int i = 0 ;i < 26 ;i ++ ) arr[i] = NULL ; leaf = false ; } }; //recursive functions: void addHelper ( Node * root , string & word , int idx ){ //base case: if ( idx == wo...