- Parentheses-Problems, Stack, Strings, Tree

Construct a Binary Tree from String with bracket representation | Set 2

  #include using namespace std;  struct Node {    Node* left;    Node* right;    int data;              Node(int element)    {        data = element;        this->left = nullptr;        this->right = nullptr;    }};  void preorder(Node* root){    if (!root)        return;      cout data…

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- Backtracking, Strings

Least count of words required to construct a target String

import*;import java.util.*;  class Sol {              int[][] countMap;      int cnt = Integer.MAX_VALUE;              public int minStickers(String[] stickers                           , String target)    {                if (target == null)            return -1;          if (target.length() ==…

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