FastPrep
Problem · Array

Find Max Number of Pairs

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Given an array, find the numbers with the same number of digits that can form the largest number of different pairs. For example, given the array {1, 9, 23, 30, 54, 103}, the possible pairs are {1, 9}, {23, 30}, {23, 54}, {30, 54}, and the output should be 4.

Examples
01 · Example 1
nums = [1, 9, 23, 30, 54, 103]
return = 4
The possible pairs with the same number of digits are:
  • {1, 9}
  • {23, 30}
  • {23, 54}
    • There are a total of 4 different pairs, so the output is 4.
    Constraints
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    public int findMaxNumberOfPairs(int[] nums) {
  // write your code here
}
    nums[1, 9, 23, 30, 54, 103]
    expected4
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