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Flatten BST to sorted list

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  // Flatten BST to Sortlisted #include <bits/stdc++.h> using namespace std ; struct Node {     int data ;     struct Node * left ;     struct Node * right ;     Node ( int val ){         data = val ;         left = NULL ;         right = NULL ;     } }; void fun ( Node * parent ){     Node * curr = parent ;     while ( curr != NULL )         cout << curr -> data << " " , curr = curr -> right ; } void inorder ( Node * curr , Node * & prev ){     if ( ! curr ) return ;     inorder ( curr -> left , prev );     prev -> left = NULL ;     prev -> right = curr ;     prev = curr ;     inorder ( curr -> right , prev ); } Node * flatten ( Node * root ){     Node * dummy = new Node ( - 1 );     N...
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Merge Two Balanced Binary Search Trees

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  #include <bits/stdc++.h> using namespace std ; #define shailesh ios :: sync_with_stdio (false); cin . tie ( 0 ); cout . tie ( 0 ); #define int long long int #define vi vector < int > #define pii pair < int, int > #define vii vector < pii > #define rep ( i , a , b ) for(int i = a; i < b; i ++ ) #define ff first #define ss second const int N = 1e5 + 10 ; bool isPowerOfTwo ( int x ){       return x && ( ! ( x & ( x - 1 ))); } bool isPrime ( int n ) {     if ( n <= 1 )     return false ;     if ( n <= 3 )     return true ;     if ( n % 2 == 0 || n % 3 == 0 )     return false ;     for ( int i = 5 ; i * i <= n ; i = i + 6 )     if ( n % i == 0 || n % ( i + 2 ) == 0 )     return false ;     return true ; } bool isPalindrome ( string S ) {     fo...
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all_operation_on_singly_linked_list

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  // all basic operation retleted to singly linked list #include <bits/stdc++.h> using namespace std ; class node {     public:     int data;     node * next;     node ( int val ){         data = val ;         next = NULL ;     } }; void insertAtTail ( node * & head , int val ){     node * n = new node ( val );     node * temp = head ;     if ( head == NULL ){         head = n;         return ;     }     while (temp->next != NULL ){         temp = temp->next;     }     temp->next = n; } void display ( node * head ){     node * temp = head ;     while (temp != NULL ){         cout << temp->data << "->" ;         temp = temp->next;     }   ...
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