LeetCode 1636: Sort Array by Increasing Frequency Solution
Master LeetCode problem 1636 (Sort Array by Increasing Frequency), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
1636. Sort Array by Increasing Frequency
Problem Explanation
Explanation
To solve this problem, we can follow these steps:
- Create a frequency map to store the frequency of each element in the input array.
- Sort the array based on the frequency of elements in increasing order. If two elements have the same frequency, sort them in decreasing order.
- Implement a custom comparator to sort the elements based on the above criteria.
- Finally, return the sorted array.
Time complexity: O(n log n)
Space complexity: O(n)
Solution Code
class Solution {
public int[] frequencySort(int[] nums) {
Map<Integer, Integer> freqMap = new HashMap<>();
for (int num : nums) {
freqMap.put(num, freqMap.getOrDefault(num, 0) + 1);
}
Arrays.sort(nums, (a, b) -> freqMap.get(a).equals(freqMap.get(b)) ? b - a : freqMap.get(a) - freqMap.get(b));
return nums;
}
}Try It Yourself
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