Leetcode Problem 2671. Frequency Tracker

2671. Frequency Tracker

Leetcode Solutions

Using HashMaps to Track Frequencies

  1. Initialize two HashMaps: numberFrequencyMap and frequencyCountMap.
  2. When add is called: a. Increment the frequency of the number in numberFrequencyMap. b. Decrement the count of the old frequency in frequencyCountMap. c. Increment the count of the new frequency in frequencyCountMap.
  3. When deleteOne is called: a. Decrement the frequency of the number in numberFrequencyMap if it's greater than 0. b. Decrement the count of the old frequency in frequencyCountMap. c. Increment the count of the new frequency in frequencyCountMap.
  4. When hasFrequency is called, return true if the frequency exists in frequencyCountMap and its count is greater than 0.
UML Thumbnail

Using Frequency Array and Count Map

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...