+ 5

How to find the frequency of numbers of in an array?

A code to output the number each element of the array occurs. {5,8,9,2,5,9} 2:1 5:2 8:1 9:2

26th Feb 2018, 9:12 AM

tylerasa

6 Answers

+ 14

// a simple approach firstlt sort the array , so that if there were duplicate elements then they will be adjacent to each other , now run a loop from n=0 , arr.length-2 a variable p inside that loop , put a if else statement inside it , if arr [n]==arr [n+1] , then increase p , else print previois no. & value of p & then initialize p with 0 again 👍

26th Feb 2018, 12:25 PM

Gaurav Agrawal

+ 4

In Java I would use HashMap. See example in my code here: https://code.sololearn.com/cPWZUgEEkD0t/#java

26th Feb 2018, 9:52 AM

MARTA

+ 2

In which language? My approach would be to create an empty array. Then iterate through the number array. Then for every new number, insert a new object to the new array. The new object should have the current number and a counter for the frequency.

26th Feb 2018, 9:38 AM

Jonathan Pizarra (JS Challenger)

+ 1

Python: arr = [5, 8, 9, 2, 5, 9] freq_map = {} for v in arr: if v in freq_map: freq_map[v] += 1 else: freq_map[v] = 1 print(freq_map)

26th Feb 2018, 9:38 AM

Ravi Chandra Enaganti

- 1

https://code.sololearn.com/c08w61d7eFih/?ref=app

27th Feb 2018, 3:02 PM

Abhimanyu Gupta

- 2

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28th Feb 2018, 11:56 AM

Jack Some Zon