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2364. Count Number of Bad Pairs
A pair of indices (i, j) with i < j is bad if j − i ≠ nums[j] − nums[i]. Count the bad pairs. There are C(n,2) pairs total; it's easier to count the good pairs and subtract.
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A pair of indices (i, j) with i < j is bad if j − i ≠ nums[j] − nums[i]. Count the bad pairs. There are C(n,2) pairs total; it's easier to count the good pairs and subtract.
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