Solution (leetcode-in-java 1.21 API)

java.lang.Object
- g2001_2100.s2023_number_of_pairs_of_strings_with_concatenation_equal_to_target.Solution

```
public class Solution
extends Object
```
2023 - Number of Pairs of Strings With Concatenation Equal to Target.
Medium

Given an array of digit strings nums and a digit string target, return the number of pairs of indices (i, j) (where i != j) such that the concatenation of nums[i] + nums[j] equals target.

Example 1:

Input: nums = [“777”,“7”,“77”,“77”], target = “7777”

Output: 4

Explanation: Valid pairs are:
- (0, 1): “777” + “7”
- (1, 0): “7” + “777”
- (2, 3): “77” + “77”
- (3, 2): “77” + “77”
Example 2:

Input: nums = [“123”,“4”,“12”,“34”], target = “1234”

Output: 2

Explanation: Valid pairs are:
- (0, 1): “123” + “4”
- (2, 3): “12” + “34”
Example 3:

Input: nums = [“1”,“1”,“1”], target = “11”

Output: 6

Explanation: Valid pairs are:
- (0, 1): “1” + “1”
- (1, 0): “1” + “1”
- (0, 2): “1” + “1”
- (2, 0): “1” + “1”
- (1, 2): “1” + “1”
- (2, 1): “1” + “1”
Constraints:
- 2 <= nums.length <= 100
- 1 <= nums[i].length <= 100
- 2 <= target.length <= 100
- nums[i] and target consist of digits.
- nums[i] and target do not have leading zeros.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Solution()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  int numOfPairs(String[] nums, String target)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- Solution
```
public Solution()
```

Method Detail

numOfPairs

public int numOfPairs(String[] nums,
                      String target)