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

vector< unordered_map<char, unordered_map<char,int>  >> v;
int j=0;
int first[300]={};

void add(string s)
{
  int n= s.size();
  
  if(n==0)
  return ;
  unordered_map<char, unordered_map<char,int>> mp;
  
  first[(int)s[0]+130]=1;
  
  if(j==0)
  {
    v.push_back(mp);
    j++;
  }
  int k=0;
  for(int i=0;i<n-1;i++)
  {
    // cout<<"t";
    int temp=v[k][s[i]][s[i+1]];
    
    if(temp==0    )
    {
      v.push_back(mp);
      v[k][s[i]][s[i+1]]=j;
      j++;
    }
    
    k=v[k][s[i]][s[i+1]];
    
  // cout<<s[i+1]<<endl;  
    
  }
 
  
}


bool find(string s)
{
  int n= s.size();
  
  if(n==0)
  return 1;
  
  if(v.empty())
  return 0;
  
  if( first[(int)s[0]+130]==0 )
  return 0;
  
  int k=0;
  for(int i=0;i<n-1;i++)
  {
    int temp= v[k][s[i]][s[i+1]];
    
    if(temp==0)
    {
      return 0;
    }else
    {
      k=temp;
      
  
      
    }
    
    // cout<<s[i+1]<<endl;
  }
  
  // if(!v[k][s[n-1]].empty())// for sub string finding comment this if statemnt
  // {
  //   // cout<<k<<endl;
  // return 0;
   
    
  // }
  
  
  return 1;
}





int main() 
{
  
  // unordered_map<char, unordered_map
  
  // add("priyanka");
  // add("prianshu");
  
  cout<<find("pria");

  
  
  
  
  
  // unordered_map<char, vector<int>> mp;
  // mp['a'].push_back(1);
  
  // if(mp['a'].empty())
  // cout<<"a"<<endl;
  
  
  
  
    // cout << "Hello, World!";
    return 0;
}
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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
}