Number Pairs That Match Target

Examples

Example 1:

Input: nums = [2, 4, 6, 3], target = 6

Output: ["2+4", "4+2", "2*3", "3*2"]

Explanation:

Example 2:

Input: nums = [1, 2, 3, 4], target = 2

Output: ["1*2", "2*1", "2/1", "4/2", "3-1", "4-2"]

Explanation:

Example 3:

Input: nums = [5, 10, 2], target = 5

Output: ["10/2", "10-5"]

Explanation:

Constraints

Given an array of integers nums and an integer target, return all pairs of numbers where one of the four arithmetic operations (+, -, *, /) produces exactly the target value.

For each valid pair (a, b) where a op b = target, return the expression as a string in the format "a{op}b" (e.g., "2+4", "3*2").

Note:

Order matters: "2+4" and "4+2" are different pairs if both produce the target.
For division, only include pairs where the division is exact (no remainder) and divisor is not zero.
Each pair uses elements at different indices. If the same value appears multiple times, each occurrence is treated as distinct.
Return each unique expression string only once, even if multiple index pairs produce the same expression.

Return the result in any order.

2 + 4 = 6, 4 + 2 = 6, 2 * 3 = 6, 3 * 2 = 6

1 * 2 = 2, 2 * 1 = 2, 2 / 1 = 2, 4 / 2 = 2, 3 - 1 = 2, 4 - 2 = 2

10 / 2 = 5, 10 - 5 = 5

2 <= nums.length <= 100

-1000 <= nums[i] <= 1000

-10000 <= target <= 10000