#include <bits/stdc++.h>
#define ll long long
#define pll pair<ll,ll>
using namespace std;
ll n, k;
ll a[10000001];
ll dp[100001][101];
vector<ll> mp[1000001];
ll tknp( ll index, ll val )
{
	ll l=0;
	ll r=mp[index].size()-1;
	ll ans=1e18;
	while ( l <= r )
	{
		ll  m = ( l + r ) / 2;
		if ( mp[index][m] > val )
		{
			ans = m;
			r = m - 1;
		}
		else
		{
			l = m +1;
		}
	}
	if (ans!=1e18) 	return mp[index][ans];
	return 1e18;
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);cout.tie(NULL);

	cin >> n >> k;
	for (int i=0;i<=n;i++)
	{
		for ( int len = 1; len <= k+1; len++ )
		{
			dp[i][len] = 1e18;
		}
	}
//	n=rand()%(20-10+1) + 10;
	//k=rand()% (20-10+1) + 10;
	//cout << n <<" "<< k << endl;
	for ( int i = 1; i <= n; i++ )
	{
		cin >> a[i];
	//	a[i]=rand() % (100-1 +1) + 1;
		dp[i-1][1] = i;
		dp[i][2]=1e18;
		dp[i-1][2]=1e18;
		mp[a[i]].push_back(i);
	}
	ll res = 1; 
	for (  int i = n-2; i>=1; i--)
	{
		dp[i][2] = 1e18;
		ll tmp = tknp( a[i+1], i+1 );
		dp[i][2] = min( dp[i+1][2], tmp );
		if ( dp[i][2] != 1e18 ) res = 2; 
	}
	
	for ( int len = 3; len <= k; len++ )
	{
		for ( int i = n-len; i>=0; i-- )		
		{
			dp[i][len]=1e18;
			ll tmp = tknp( a[i+1], dp[i+1][len-2]);
			dp[i][len]=min(dp[i+1][len], tmp);
			if ( dp[i][len] != 1e18 ) res = len;
		}
	}

	cout << res;
	return 0;
}
//dadauThanhHieu
//TUWR_team
//Written_by_ZuY
/*
18 19
35 1 70 25 79 59 63 65 6 46 82 28 62 92 96 43 28 37
18
*/
 

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
}