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- n, r = map(int, input().split())
- nums = list(map(int, input().split()))
- p1 = p2 = res =0
- while p2 < n:
- if nums[p2] - nums[p1] <= r:
- p2 += 1
- else:
- res += n - p2
- p1 += 1
- print(res)
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