 #include <iostream>
#include <bits/stdc++.h>
#include <string>

using namespace std;

void recursionLoop(string str){
  int n = str.length();
  if(n <= 2){
    return;
  }
  
  unordered_multimap<int,string> umap1;
  unordered_multimap<int,string> umap2;
  for(int i=0;i< n/2 - 1;i++){
    string temp = "";
      temp +=str[i];
      if(temp == "(" || temp == ")")
        umap1.insert({0,temp});
        
      if(temp == "{" || temp == "}")
        umap1.insert({1,temp});
        
      if(temp == "[" || temp == "]")
        umap1.insert({2,temp});
  }
  
  auto it = umap1.begin();
  
  
  // for(int j=n/2;j<n-1;j++){
  //   string temp = "";
  //     temp +=str[j];
  //     if(temp == "(" || temp == ")")
  //       umap2.insert({0,temp});
        
  //     if(temp == "{" || temp == "}")
  //       umap2.insert({1,temp});
        
  //     if(temp == "[" || temp == "]")
  //       umap2.insert({2,temp});
  // }
  
}

// bool checkOrder(string str){
//   int n = str.length();
  
//   if(n==0){
//     return;
//   }
  
//   for(int i=0;i< n/2 - 1;i++){
//     string temp = "";
//       temp +=str[i];
//       if(temp == "(" || temp == ")")
//         umap1.insert({0,temp});
        
//       if(temp == "{" || temp == "}")
//         umap1.insert({1,temp});
        
//       if(temp == "[" || temp == "]")
//         umap1.insert({2,temp});
//   }
  
//   for(int j=n/2;j<n-1;j++){
//     string temp = "";
//       temp +=str[j];
//       if(temp == "(" || temp == ")")
//         umap2.insert({0,temp});
        
//       if(temp == "{" || temp == "}")
//         umap2.insert({1,temp});
        
//       if(temp == "[" || temp == "]")
//         umap2.insert({2,temp});
//   }
  
//   }
  

int main() 
{
  string str = "[{()}]";
    
    unordered_multimap<int,string> umap;
    
    
    
    for(int i=0;i<str.length();i++){
      string temp = "";
      temp +=str[i];
      if(temp == "(" || temp == ")")
        umap.insert({0,temp});
        
      if(temp == "{" || temp == "}")
        umap.insert({1,temp});
        
      if(temp == "[" || temp == "]")
        umap.insert({2,temp});
    }
  
  
  
  
    
    
    unordered_multimap<int,string> :: iterator itr;
    
    
    
}

created 2 years ago

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
}