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

int maxTickets(vector < int > tickets) {
        sort(tickets.begin(), tickets.end());
        int iValue;
        vector < vector < int >* > vcArray;
        vector<int> *vctemp = new vector<int>;
        int i;
        for (i = 1; i < tickets.size(); i++)
        {
                if (tickets[i - 1]+1 == tickets[i])
                {
                        vctemp->push_back(tickets[i - 1]);
                }
                else
                {
                        vctemp->push_back(tickets[i - 1]);
                        vcArray.push_back(vctemp);
                        vctemp = new vector<int>;
                }
        }
        i--;
        if (tickets[i - 1]+1 == tickets[i])
        {
                vctemp->push_back(tickets[i - 1]);
                vcArray.push_back(vctemp);
        }
        else
        {
                vctemp->push_back(tickets[i - 1]);
                vcArray.push_back(vctemp);
                vctemp = new vector<int>;
        }
                
        unsigned int iMax = 0;
        int j;
        for ( j= 1; j < vcArray.size(); j++)
        {
                if (vcArray[j - 1]->size() >= vcArray[j]->size())
                        iMax = vcArray[j-1]->size();
        }
        j--;
        if (vcArray[j - 1]->size() >= vcArray[j]->size())
                iMax = vcArray[j-1]->size();

        return iMax;
}

int main() 
{
    int n;
    cin >> n;
    vector<int> ans;
    for(int i=0;i<n;i++){
      int ch;
      cin >> ch;
      ans.push_back(ch);
    }
    cout << maxTickets(ans);
    return 0;
}
by

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
}