count-number-of-bad-pairs

Count Number of Bad Pairs

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countBadPairs

You are given a 0-indexed integer array <code>nums</code>. A pair of indices <code>(i, j)</code> is a bad pair if <code>i &lt; j</code> and <code>j - i != nums[j] - nums[i]</code>.

Return the total number of bad pairs in <code>nums</code>.

&nbsp;
Example 1:

<pre>
Input: nums = [4,1,3,3]
Output: 5
Explanation: The pair (0, 1) is a bad pair since 1 - 0 != 1 - 4.
The pair (0, 2) is a bad pair since 2 - 0 != 3 - 4, 2 != -1.
The pair (0, 3) is a bad pair since 3 - 0 != 3 - 4, 3 != -1.
The pair (1, 2) is a bad pair since 2 - 1 != 3 - 1, 1 != 2.
The pair (2, 3) is a bad pair since 3 - 2 != 3 - 3, 1 != 0.
There are a total of 5 bad pairs, so we return 5.
</pre>

Example 2:

<pre>
Input: nums = [1,2,3,4,5]
Output: 0
Explanation: There are no bad pairs.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 105</code></li>
	<li><code>1 &lt;= nums[i] &lt;= 109</code></li>
</ul>

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