Leetcode Problem 982. Triples with Bitwise AND Equal To Zero

982. Triples with Bitwise AND Equal To Zero

Leetcode Solutions

Counting AND Triples with Bitwise Operations and Hashmap

  1. Initialize a hashmap (or an array of size 1<<16) to store frequencies of bitwise AND results of all pairs in the input array.
  2. Iterate over all pairs of numbers in the input array and increment the count of their bitwise AND result in the hashmap.
  3. Initialize a variable to store the total count of AND triples.
  4. For each number in the input array, calculate its complement with respect to the maximum possible value (0xFFFF).
  5. Iterate over the hashmap and for each key, check if the bitwise AND of the key and the complement of the current number is zero. If so, add the value associated with the key to the total count.
  6. Return the total count of AND triples.
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Brute Force Triple Loop

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