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

struct trie
{
  bool end;
  map<char,trie*> mp;
  trie()
  {
    end = false;
  }
};
void insert(trie*& root,string s)
{
  if(root == NULL)
    root = new trie();
  trie* temp = root;
  
  for(auto i:s)
  {
    if(temp->mp.find(i) == temp->mp.end())
      {
        temp->mp[i] = new trie;
      }
    temp = temp->mp[i];
    
      
  }
  temp->end = true;
}
bool find(trie* root, string s)
{
  trie* tp = root;
  for(auto i:s)
  {
    if(tp->mp.find(i) == tp->mp.end())
      return false;
    cout<<i<<" ";
    tp = tp->mp[i];
  }
  cout<<"\n";
  return tp->end;
}
void print(trie* root)
{
  for(auto i = root->mp.begin();i!= root->mp.end();++i)
  {
    // if(root->mp.size() > 1)
    //   cout<<root->mp.size()<<"\n";
    cout<<i->first<<" ";
    
    print(root->mp[i->first]);
    // cout<<"-";
  }
  cout<<"\n";
}
int main() 
{
    trie* root = NULL;
    int n;
    cin>>n;
    for(int i = 0; i <n ;++i)
    {
      string s ;
      cin>>s;
      insert(root,s);
    }
    string st;
    cin>>st;
    // cout<<find(root,st);
    print(root);
    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
}