Leetcode Problem 2198. Number of Single Divisor Triplets

2198. Number of Single Divisor Triplets

Leetcode Solutions

Counting with Frequency Table and Combinatorics

  1. Initialize a frequency table to count occurrences of each number in the input array.
  2. Iterate over all possible combinations of three numbers (i, j, k) within the range [1, 100].
  3. For each triplet, calculate the sum (s = i + j + k).
  4. Check if the sum is divisible by exactly one of the numbers in the triplet.
  5. If the condition is met, calculate the number of valid triplets using the frequency table and combinatorics.
  6. Consider special cases where two or three numbers in the triplet are the same.
  7. Sum up the number of valid triplets for all combinations and return the result.
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Brute Force with Optimization

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