ms1797

class Solution {
public:    
    string minWindow(string s, string t) {
        unordered_map<char, int> table;
        
        // initialize frequency table for t
        for(char c : t){
            table[c]++;
        }
        

ms1797

/*
  Infix to postfix conversion in C++
  Input Postfix expression must be in a desired format.
  Operands and operator, both must be single character.
  Only '+'  ,  '-'  , '*', '/' and '^' (for exponentiation)  operators are expected.
*/
#include<iostream>
#include<stack>
#include<string>

mycodeschool

/* Deleting a node from Binary search tree */
#include<iostream>
using namespace std;
struct Node {
	int data;
	struct Node *left;
	struct Node *right;
};
//Function to find minimum in a tree. 
Node* FindMin(Node* root)

mycodeschool

/* Binary Tree Traversal - Preorder, Inorder, Postorder */
#include<iostream>
using namespace std;
 
struct Node {
	char data;
	struct Node *left;
	struct Node *right;
};

mycodeschool

/* Binary tree - Level Order Traversal */
#include<iostream>
#include<queue>
using namespace std;

struct Node {
	char data;
	Node *left;
	Node *right;
};

mycodeschool

/*
  Evaluation Of postfix Expression in C++ 
  Input Postfix expression must be in a desired format. 
  Operands must be integers and there should be space in between two operands.
  Only '+'  ,  '-'  , '*' and '/'  operators are expected. 
*/
#include<iostream>
#include<stack>
#include<string>

mycodeschool

/*Queue - Linked List implementation*/
#include<stdio.h>
#include<stdlib.h>
struct Node {
	int data;
	struct Node* next;
};
// Two glboal variables to store address of front and rear nodes. 
struct Node* front = NULL;
struct Node* rear = NULL;

mycodeschool

/*
  C++ Program to check for balanced parentheses in an expression using stack.
  Given an expression as string comprising of opening and closing characters
  of parentheses - (), curly braces - {} and square brackets - [], we need to 
  check whether symbols are balanced or not. 
*/
#include<iostream>
#include<stack>
#include<string>
using namespace std;