Leetcode Problem 2206. Divide Array Into Equal Pairs

2206. Divide Array Into Equal Pairs

Leetcode Solutions

Using Frequency Array

  • Initialize a frequency array freq of size 501 with all elements set to 0.
  • Iterate over the nums array and for each number num in nums, increment freq[num] by 1.
  • Iterate over the freq array and for each count freq[i], check if it is even.
    • If any freq[i] is odd, return false.
  • If all counts are even, return true.
UML Thumbnail

Using HashMap to Count Frequencies

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