Design an algorithm to find all pairs of integers within an array which sum to a specified value.

Example 1:

Input: nums = [5,6,5], target = 11

Output: [[5,6]]

Example 2:

Input: nums = [5,6,5,6], target = 11

Output: [[5,6],[5,6]]

Note:

• nums.length <= 100000
• -10^5 <= nums[i], target <= 10^5