# 1855. Maximum Distance Between a Pair of Values

<https://leetcode.com/problems/maximum-distance-between-a-pair-of-values>

## Description

You are given two **non-increasing 0-indexed** integer arrays `nums1`​​​​​​ and `nums2`​​​​​​.

A pair of indices `(i, j)`, where `0 <= i < nums1.length` and `0 <= j < nums2.length`, is **valid** if both `i <= j` and `nums1[i] <= nums2[j]`. The **distance** of the pair is `j - i`​​​​.

Return *the **maximum distance** of any **valid** pair* `(i, j)`*. If there are no valid pairs, return* `0`.

An array `arr` is **non-increasing** if `arr[i-1] >= arr[i]` for every `1 <= i < arr.length`.

**Example 1:**

```
**Input:** nums1 = [55,30,5,4,2], nums2 = [100,20,10,10,5]
**Output:** 2
**Explanation:** The valid pairs are (0,0), (2,2), (2,3), (2,4), (3,3), (3,4), and (4,4).
The maximum distance is 2 with pair (2,4).
```

**Example 2:**

```
**Input:** nums1 = [2,2,2], nums2 = [10,10,1]
**Output:** 1
**Explanation:** The valid pairs are (0,0), (0,1), and (1,1).
The maximum distance is 1 with pair (0,1).
```

**Example 3:**

```
**Input:** nums1 = [30,29,19,5], nums2 = [25,25,25,25,25]
**Output:** 2
**Explanation:** The valid pairs are (2,2), (2,3), (2,4), (3,3), and (3,4).
The maximum distance is 2 with pair (2,4).
```

**Example 4:**

```
**Input:** nums1 = [5,4], nums2 = [3,2]
**Output:** 0
**Explanation:** There are no valid pairs, so return 0.
```

**Constraints:**

* `1 <= nums1.length <= 105`
* `1 <= nums2.length <= 105`
* `1 <= nums1[i], nums2[j] <= 105`
* Both `nums1` and `nums2` are **non-increasing**.

## ac

```java
```


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