export function countPairsWithDiffK(numbers, k) {
  const counts = new Map();
  let counter = 0;

  for (const num of numbers) {
    counts.set(num, (counts.get(num) || 0) + 1);
  }

  
  for (const [num, count] of counts.entries()) {
    console.log({num, count})

    if (k === 0) {
      if (count > 1) counter++;
    } else {
      if (counts.has(num + k)) {
        counter++;
      }
    }
  }

  return counter;
}