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Top k frequent words solution

Here given code implementation process.

/*
    Java program for
    Top k frequent words solution
*/
import java.util.HashMap;
import java.util.ArrayList;
public class Occurrence
{
	public void topKfrequent(String[] words, int n, int k)
	{
		HashMap < String, Integer > frequency = new HashMap < String, Integer > ();
		HashMap < Integer, ArrayList < String >> result = new HashMap < > ();
		int count = 0;
		for (int i = 0; i < n; i++)
		{
			if (frequency.containsKey(words[i]))
			{
				//when key exist then put new key
				frequency.put(words[i], frequency.get(words[i]) + 1);
			}
			else
			{
				frequency.put(words[i], 1);
			}
		}
		// Combine elements by frequency
		for (String data: frequency.keySet())
		{
			if (result.containsKey(frequency.get(data)))
			{
				result.get(frequency.get(data)).add(data);
			}
			else
			{
				result.put(frequency.get(data), new ArrayList < String > ());
				result.get(frequency.get(data)).add(data);
			}
		}
		System.out.print("  Top " + k + " element is \n");
		for (int i = n - 1; i >= 0; --i)
		{
			if (result.containsKey(i))
			{
				for (String data: result.get(i))
				{
					System.out.print("  " + data);
					count++;
					if (count == k)
					{
						return;
					}
				}
			}
		}
		if (count != k)
		{
			System.out.print(" All top " + k + " element are not exist");
		}
	}
	public static void main(String[] args)
	{
		Occurrence task = new Occurrence();
		String[] words = {
			"good" , "move" , "this" , "free" , 
          "bad" , "good" , "is" , "game" ,
          "is" , "logic" , "move" , "logic" , 
          "code" , "is" , "move" , "game","good"
		};
		int n = words.length;
		int k = 4;
		task.topKfrequent(words, n, k);
	}
}

Output

  Top 4 element is
  move  is  good  game
// Include header file
#include <iostream>
#include <unordered_map>
#include <vector>

using namespace std;
class Occurrence
{
	public: void topKfrequent(string words[], int n, int k)
	{
		unordered_map < string, int > frequency;
		unordered_map < int, vector < string > > result;
		int count = 0;
		for (int i = 0; i < n; i++)
		{
			if (frequency.find(words[i]) != frequency.end())
			{
				//when key exist then put new key
				frequency[words[i]] = frequency[words[i]] + 1;
			}
			else
			{
				frequency[words[i]] = 1;
			}
		}
		// Combine elements by frequency
		for (auto &data: frequency)
		{
			if (result.find(data.second) != result.end())
			{
				result[data.second].push_back(data.first);
			}
			else
			{
				result[data.second].push_back(data.first);
			}
		}
		cout << "  Top " << k << " element is \n";
		for (int i = n - 1; i >= 0; --i)
		{
			if (result.find(i) != result.end())
			{
				for (auto &data: result[i])
				{
					cout << "  " << data;
					count++;
					if (count == k)
					{
						return;
					}
				}
			}
		}
		if (count != k)
		{
			cout << " All top " << k << " element are not exist";
		}
	}
};
int main()
{
	Occurrence *task = new Occurrence();
	string words[] = {
		"good" , "move" , "this" , "free" , 
        "bad" , "good" , "is" , "game" , "is" , 
       "logic" , "move" , "logic" , "code" , 
       "is" , "move" , "game", "good"
	};
	int n = sizeof(words) / sizeof(words[0]);
	int k = 4;
	task->topKfrequent(words, n, k);
	return 0;
}

Output

  Top 4 element is
  is  good  move  logic
// Include namespace system
using System;
using System.Collections.Generic;
public class Occurrence
{
	public void topKfrequent(String[] words, int n, int k)
	{
		Dictionary < string, int > frequency = 
          new Dictionary < string, int > ();
		Dictionary < int, List < string >> result = 
          new Dictionary <int, List < string >> ();
		int count = 0;
		for (int i = 0; i < n; i++)
		{
			if (frequency.ContainsKey(words[i]))
			{
				//when key exist then put new key
				frequency[words[i]] = frequency[words[i]] + 1;
			}
			else
			{
				frequency.Add(words[i], 1);
			}
		}
		// Combine elements by frequency
		foreach(KeyValuePair < String, int > data in frequency)
		{
			if (result.ContainsKey(data.Value))
			{
				result[data.Value].Add(data.Key);
			}
			else
			{
				result.Add(data.Value, new List < string > ());
				result[data.Value].Add(data.Key);
			}
		}
		Console.Write("  Top " + k + " element is \n");
		for (int i = n - 1; i >= 0; --i)
		{
			if (result.ContainsKey(i))
			{
				foreach(String data in result[i])
				{
					Console.Write("  " + data);
					count++;
					if (count == k)
					{
						return;
					}
				}
			}
		}
		if (count != k)
		{
			Console.Write(" All top " + k + " element are not exist");
		}
	}
	public static void Main(String[] args)
	{
		Occurrence task = new Occurrence();
		String[] words = {
		  "good" , "move" , "this" , "free" , 
          "bad" , "good" , "is" , "game" , 
          "is" , "logic" , "move" , "logic" , 
          "code" , "is" , "move" , "game", "good"
		};
		int n = words.Length;
		int k = 4;
		task.topKfrequent(words, n, k);
	}
}

Output

  Top 4 element is
  good  move  is  game
package main
import "fmt"
/*
    Go program for
    Top k frequent words solution
*/

func topKfrequent(words[] string, n int, k int) {
	var frequency = make(map[string] int)
	var result = make(map[int] []string)
	var count int = 0
	for i := 0 ; i < n ; i++ {
		if _, found := frequency[words[i]] ; found {
			//when key exist then put new key
			frequency[words[i]] = frequency[words[i]] + 1
		} else {
			frequency[words[i]] = 1
		}
	}
	// Combine elements by frequency
	for k, v := range frequency {
		if _, found := result[v] ; found {
			result[v] = append(result[v], k)
		} else {
			result[v] = make([]string,0)
			result[v] = append(result[v], k)
		}
	}
	fmt.Print("  Top ", k, " element is \n")
	for i := n - 1 ; i >= 0 ; i-- {
		if _, found := result[i] ; found {
			for _, v := range result[i] {
				fmt.Print("  ", v)
				count++
				if count == k {
					return
				}
			}
		}
	}
	if count != k {
		fmt.Print(" All top ", k, " element are not exist")
	}
}
func main() {
	
	var words = [] string {"good",
		"move",
		"this",
		"free",
		"bad",
		"good",
		"is",
		"game",
		"is",
		"logic",
		"move",
		"logic",
		"code",
		"is",
		"move",
		"game",
		"good"}
	var n int = len(words)
	var k int = 4
	topKfrequent(words, n, k)
}

Output

Top 4 element is 
  move  is  good  logic
<?php
class Occurrence
{
	public	function topKfrequent($words, $n, $k)
	{
		$frequency = array();
		$result = array();
		$count = 0;
		for ($i = 0; $i < $n; $i++)
		{
			if (array_key_exists($words[$i], $frequency))
			{
				//when key exist then put new key
				$frequency[$words[$i]] = $frequency[$words[$i]] + 1;
			}
			else
			{
				$frequency[$words[$i]] = 1;
			}
		}
		// Combine elements by frequency
		foreach($frequency as $key => $value)
		{
			if (array_key_exists($value, $result))
			{
				$result[$value][] = $key;
			}
			else
			{
				$result[$value] = array();
				$result[$value][] = $key;
			}
		}
		echo("  Top ".$k." element is \n");
		for ($i = $n - 1; $i >= 0; --$i)
		{
			if (array_key_exists($i, $result))
			{
				foreach($result[$i] as $key => $value)
				{
					echo("  ".$value);
					$count++;
					if ($count == $k)
					{
						return;
					}
				}
			}
		}
		if ($count != $k)
		{
			echo(" All top ".$k.
				" element are not exist");
		}
	}
}

function main()
{
	$task = new Occurrence();
	$words = array("good", "move", "this", "free", 
                   "bad", "good", "is", "game", "is", 
                   "logic", "move", "logic", "code", 
                   "is", "move", "game", "good");
	$n = count($words);
	$k = 4;
	$task->topKfrequent($words, $n, $k);
}
main();

Output

  Top 4 element is
  good  move  is  game
class Occurrence
{
	topKfrequent(words, n, k)
	{
		var frequency = new Map();
		var result = new Map();
		var count = 0;
		for (var i = 0; i < n; i++)
		{
			if (frequency.has(words[i]))
			{
				//when key exist then put new key
				frequency.set(words[i], frequency.get(words[i]) + 1);
			}
			else
			{
				frequency.set(words[i], 1);
			}
		}
		// Combine elements by frequency
		for (let [key, value] of frequency)
		{
			if (result.has(value))
			{
				result.get(value).push(key);
			}
			else
			{
				result.set(value, []);
				result.get(value).push(key);
			}
		}
		process.stdout.write("  Top " + k + " element is \n");
		for (var i = n - 1; i >= 0; --i)
		{
			if (result.has(i))
			{
				for (let data of result.get(i) )
				{
					process.stdout.write("  " + data);
					count++;
					if (count == k)
					{
						return;
					}
				}
			}
		}
		if (count != k)
		{
			process.stdout.write(" All top " + k + " element are not exist");
		}
	}
}

function main()
{
	var task = new Occurrence();
	var words = ["good", "move", "this", "free", 
                 "bad", "good", "is", "game", "is", 
                 "logic", "move", "logic", "code", 
                 "is", "move", "game", "good"];
	var n = words.length;
	var k = 4;
	task.topKfrequent(words, n, k);
}
main();

Output

  Top 4 element is
  good  move  is  game
#    Python 3 program for
#    Top k frequent words solution
class Occurrence :
	def topKfrequent(self, words, n, k) :
		frequency = dict()
		result = dict()
		count = 0
		i = 0
		while (i < n) :
			if ((words[i] in frequency.keys())) :
				# when key exist then put new key
				frequency[words[i]] = frequency.get(words[i]) + 1
			else :
				frequency[words[i]] = 1
			
			i += 1
		
		for key, value in frequency.items() :
			if ((value in result.keys())) :
				result.get(value).append(key)
			else :
				result[value] = []
				result.get(value).append(key)
			
		
		print("  Top ", k ," element is ")
		i = n - 1
		while (i >= 0) :
			if ((i in result.keys())) :
				for data in result.get(i) :
					print(" ", data, end = "")
					count += 1
					if (count == k) :
						return
					
				
			
			i -= 1
		
		if (count != k) :
			print(" All top ", k ," element are not exist", end = "")
		
	

def main() :
	task = Occurrence()
	words = ["good", "move", "this", "free", 
             "bad", "good", "is", "game", "is", 
             "logic", "move", "logic", "code", 
             "is", "move", "game", "good"]
	n = len(words)
	k = 4
	task.topKfrequent(words, n, k)

if __name__ == "__main__": main()

Output

  Top  4  element is
  is  good  move  game
#    Ruby program for
#    Top k frequent words solution
class Occurrence 
	def topKfrequent(words, n, k) 
		frequency = Hash.new()
		result = Hash.new()
		count = 0
		i = 0
		while (i < n) 
			if (frequency.key?(words[i])) 
				# when key exist then put new key
				frequency[words[i]] = frequency[words[i]] + 1
			else
 
				frequency[words[i]] = 1
			end

			i += 1
		end

		#  Combine elements by frequency
		frequency.each { | key, value |
			if (result.key?(value)) 
				result[value].push(key)
			else
 
				result[value] = []
				result[value].push(key)
			end

		}
		print("  Top ", k ," element is \n")
		i = n - 1
		while (i >= 0) 
			if (result.key?(i)) 
				for data in result[i] do 
					print("  ", data)
					count += 1
					if (count == k) 
						return
					end

				end

			end

			i -= 1
		end

		if (count != k) 
			print(" All top ", k ," element are not exist")
		end

	end

end

def main() 
	task = Occurrence.new()
	words = ["good", "move", "this", "free", 
             "bad", "good", "is", "game", "is", 
             "logic", "move", "logic", "code", 
             "is", "move", "game", "good"]
	n = words.length
	k = 4
	task.topKfrequent(words, n, k)
end

main()

Output

  Top 4 element is 
  good  move  is  game
import scala.collection.mutable._;
/*
    Scala program for
    Top k frequent words solution
*/
class Occurrence()
{
	def topKfrequent(words: Array[String], n: Int, k: Int): Unit = {
		var frequency = Map[String, Int]();
		var result =  Map[Int, ArrayBuffer[String]]();
		var count: Int = 0;
		var i: Int = 0;
		while (i < n)
		{
			if (frequency.contains(words(i)))
			{
				//when key exist then put new key
				frequency.addOne(words(i), frequency.get(words(i)).get + 1);
			}
			else
			{
				frequency.addOne(words(i), 1);
			}
			i += 1;
		}
		// Combine elements by frequency
		for ((key, value) <- frequency)
		{
			if (result.contains(value))
			{
				result.get(value).get += key;
			}
			else
			{
				result.addOne(value, new ArrayBuffer[String]());
				result.get(value).get += key;
			}
		}
		print("  Top " + k + " element is \n");
		i = n - 1;
		while (i >= 0)
		{
			if (result.contains(i))
			{
              	for ((v) <- result.get(i).get)
				{
					print("  " + v);
					count += 1;
					if (count == k)
					{
						return;
					}
				}
			}
			i -= 1;
		}
		if (count != k)
		{
			print(" All top " + k + " element are not exist");
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: Occurrence = new Occurrence();
		var words: Array[String] = Array(
          "good", "move", "this", "free", 
          "bad", "good", "is", "game", "is", 
          "logic", "move", "logic", "code", 
          "is", "move", "game","good");
		var n: Int = words.length;
		var k: Int = 4;
		task.topKfrequent(words, n, k);
	}
}

Output

  Top 4 element is
  move  is  good  game
import Foundation;
/*
    Swift 4 program for
    Top k frequent words solution
*/
class Occurrence
{
	func topKfrequent(_ words: [String], _ n: Int, _ k: Int)
	{
		var frequency =  [String : Int]();
		var result = [Int : [String]]();
		var count: Int = 0;
		var i: Int = 0;
		while (i < n)
		{
			if (frequency.keys.contains(words[i]))
			{
				//when key exist then put new key
				frequency[words[i]] = frequency[words[i]]! + 1;
			}
			else
			{
				frequency[words[i]] = 1;
			}
			i += 1;
		}
		// Combine elements by frequency
		for (key, value) in frequency
		{
          	if (result.keys.contains(value) == false)
            {
                result[value] = [String]();
            }
			
			result[value]!.append(key);
			
		}
		print("  Top ", k ," element is ");
		i = n - 1;
		while (i >= 0)
		{
			if (result.keys.contains(i))
			{
				for data in result[i]!
				{
					print("  ", data, terminator: "");
					count += 1;
					if (count == k)
					{
						return;
					}
				}
			}
			i -= 1;
		}
		if (count  != k)
		{
			print(" All top ", k ," element are not exist", terminator: "");
		}
	}
}
func main()
{
	let task: Occurrence = Occurrence();
	let words: [String] = ["good", "move", "this", "free", 
                           "bad", "good", "is", "game", 
                           "is", "logic", "move", "logic", 
                           "code", "is", "move", "game", "good"];
	let n: Int = words.count;
	let k: Int = 4;
	task.topKfrequent(words, n, k);
}
main();

Output

  Top  4  element is
   good   move   is   logic
/*
    Kotlin program for
    Top k frequent words solution
*/
class Occurrence
{
	fun topKfrequent(words: Array < String > , n: Int, k: Int): Unit
	{
		var frequency = mutableMapOf < String, Int > ();
		var result = mutableMapOf<Int, ArrayList <String> >();
		var count: Int = 0;
		var i: Int = 0;
		while (i < n)
		{
			if (frequency.containsKey(words[i]))
			{
				//when key exist then put new key
				frequency.put(words[i], frequency.getValue(words[i]) + 1);
			}
			else
			{
				frequency.put(words[i], 1);
			}
			i += 1;
		}
		// Combine elements by frequency
		for ((key, value) in frequency)
		{
			if (result.containsKey(value))
			{
				result.getValue(value).add(key);
			}
			else
			{
				result.put(value, ArrayList < String > ());
				result.getValue(value).add(key);
			}
		}
		print("  Top " + k + " element is \n");
		i = n - 1;
		while (i >= 0)
		{
			if (result.containsKey(i))
			{
				for (data in result.getValue(i))
				{
					print("  " + data);
					count += 1;
					if (count == k)
					{
						return;
					}
				}
			}
			i -= 1;
		}
		if (count != k)
		{
			print(" All top " + k + " element are not exist");
		}
	}
}
fun main(args: Array < String > ): Unit
{
	val task: Occurrence = Occurrence();
	val words: Array < String > = arrayOf(
      "good", "move", "this", "free", "bad", 
      "good", "is", "game", "is", "logic", 
      "move", "logic", "code", "is", 
      "move", "game", "good");
	val n: Int = words.count();
	val k: Int = 4;
	task.topKfrequent(words, n, k);
}

Output

  Top 4 element is
  good  move  is  game

Comment

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♲ George Gomes     ⟶ 688 Day ago 
I found that using https://youtube.com/playlist?list=PL1MJrDFRFiKYjsnJQZW7hUudwYqLyJZgv and follow through this playlist will really give me a good understanding about Top K Element.
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