#include <bits/stdc++.h>
using namespace std;

string minWindow(string s, string t) {
  
  map<char, int> sCount;
  map<char, int> tCount;
  
  for(int i = 0; i<t.length(); i++) {
    tCount[t[i]]++;
    //sCount[s[i]]++;
  }
  
  int l, r = 0;
  int have = 0;
  int need = tCount.size();
  int resl = 0;
  int resr = 0;
  int resc = -1;

  while(r<s.length()) {
    
    sCount[s[r]]++;
    
    // if element present in tCount
    if(tCount.find(s[r]) != tCount.end()) {
      if(sCount[s[r]] == tCount[s[r]]) {
        have++;
      }
    }
    //cout<<"l: " << l << " r: " << r << " Have: " << have << " Need: "<< need<< "\n";
    while( have == need) {
      
      if(resc == -1 || r-l+1 < resc) {
        resc = r-l + 1;
        resl = l;
        resr = r;
      }
      
      
      sCount[s[l]]--;
     
     //cout<<"l: " << l<<" r: " << r << " Have: " << have << " Need: "<< need<< "\n";
    
      if(tCount.find(s[l]) != tCount.end()) {
        if(sCount[s[l]] < tCount[s[l]]) {
          have--;
        }
      }
      
      l++;
    }
    
    r++;
  }
  
  //cout<<resl<< " " <<resr<< " " <<resc;
  return resc != -1 ? s.substr(resl, resc) : "";    
}

int main() 
{
    cout << "Hello, World! \n";
    string 
    s = "ADOBECODEBANC", t = "ABC";
    //s = "a", t = "a";
    //s = "a", t = "aa";
    cout<<"minWindow is: " << minWindow(s, t);
    return 0;
}
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C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}