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Smallest Missing Non-negative Integer After Operations

Medium

You receive a 0-indexed integer array nums and an integer value.

In one operation, you can add or subtract value from any element of nums.

  • For example, if nums = [1,2,3] and value = 2, you can choose to subtract value from nums[0] to make nums = [-1,2,3].

The MEX (fewest excluded) of an array is the smallest missing non-negative integer in it.

  • For example, the MEX of [-1,2,3] is 0 while the MEX of [1,0,3] is 2.

Find and provide the largest MEX of nums after applying the mentioned operation any count of times.

Example 1

Input: nums = [1,-10,7,13,6,8], value = 5

Output: 4

Explanation: One can achieve this result by applying the following operations:

  • Add value to nums[1] twice to make nums = [1, 0,7,13,6,8]

  • Subtract value from nums[2] once to make nums = [1,0, 2,13,6,8]

  • Subtract value from nums[3] twice to make nums = [1,0,2, 3,6,8]

The MEX of nums is 4. It can be shown that 4 is the largest MEX we can achieve.

Example 2

Input: nums = [1,-10,7,13,6,8], value = 7

Output: 2

Explanation: One can achieve this result by applying the following operation:

  • Subtract value from nums[2] once to make nums = [1,-10, 0,13,6,8]

The MEX of nums is 2. It can be shown that 2 is the largest MEX we can achieve.

Constraints

  • 1 <= nums.length, value <= 10^5
  • -10^9<= nums[i] <= 10^9

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