#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

int main() 
{
    //std::string str {};
    std::vector<std::string> str; // вектор для хранения слов
    // Буфер для ввода фамилии студента
    std::string buffer = "";
    
    
    
    std::string simbol {}; // символы строки
    int count {}, counter {}, n {}; // счетчик символов
    int firstIndex {}, finalIndex {};
    int m[10000] {};
    
    //getline(std::cin, str);
    do {
        std::getline(std::cin, buffer);
        if (buffer.size() > 0) {
            // Добавление элемента в конец вектора
            str.push_back(buffer);
        }
    } while (buffer != "");
    
    
    //std::cout << str << std::endl;
    //int strSize = str.length();
    int strSize = str.size();
    std::cout << "Размер массива: " << strSize << std::endl;
    
    for(int i = 0; i < strSize; i+=2) {
      
      if(str[i - 2] != str[i]) {
        
        simbol[count] = str[i]; // искомые числа
        
        std::cout << i << "\n";
        m[count] = i;
        
        ++count;
        
      }
      
    }
     std::cout << std::endl;
     
     for(int j = 0; j < count; j++) {
        std::cout << simbol[j] << "\t";
        std::cout << m[j] << "\t";
        
        int nextIndex {}, previousIndex {}, lastIndex {};
       
        firstIndex = str.find(simbol[j]);
        if(firstIndex < m[j]) firstIndex = m[j];
        std::cout << firstIndex << "\t";
        
        lastIndex = str.find_last_of(simbol[j]);
        std::cout << lastIndex << "\t";
        
        nextIndex =  str.find(simbol[j + 1], firstIndex);
        std::cout << nextIndex << "\t";
        
        finalIndex = nextIndex - firstIndex;
        
        //std::cout << str[nextIndex] << "\t";
        
        int size {};
        //size = str.substr(firstIndex, finalIndex).length();
        //std::cout << size << "\t";
        //str = str.substr(firstIndex, finalIndex);
        //std::cout << size << "\n";
        std::cout << str.substr(firstIndex, finalIndex) << "\n";
     }

    
    return 0;
}

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
}