908. Smallest Range I

Description

You are given an integer array nums and an integer k.

In one operation, you can choose any index i where 0 <= i < nums.length and change nums[i] to nums[i] + x where x is an integer from the range [-k, k]. You can apply this operation at most once for each index i.

The score of nums is the difference between the maximum and minimum elements in nums.

Return the minimum score of nums after applying the mentioned operation at most once for each index in it.

 

Example 1:

Input: nums = [1], k = 0
Output: 0
Explanation: The score is max(nums) - min(nums) = 1 - 1 = 0.

Example 2:

Input: nums = [0,10], k = 2
Output: 6
Explanation: Change nums to be [2, 8]. The score is max(nums) - min(nums) = 8 - 2 = 6.

Example 3:

Input: nums = [1,3,6], k = 3
Output: 0
Explanation: Change nums to be [4, 4, 4]. The score is max(nums) - min(nums) = 4 - 4 = 0.

 

Constraints:

  • 1 <= nums.length <= 104
  • 0 <= nums[i] <= 104
  • 0 <= k <= 104

Solutions

Solution 1

Python Code
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class Solution:
    def smallestRangeI(self, nums: List[int], k: int) -> int:
        mx, mi = max(nums), min(nums)
        return max(0, mx - mi - k * 2)

Java Code
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class Solution {
    public int smallestRangeI(int[] nums, int k) {
        int mx = 0;
        int mi = 10000;
        for (int v : nums) {
            mx = Math.max(mx, v);
            mi = Math.min(mi, v);
        }
        return Math.max(0, mx - mi - k * 2);
    }
}

C++ Code
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class Solution {
public:
    int smallestRangeI(vector<int>& nums, int k) {
        auto [mi, mx] = minmax_element(nums.begin(), nums.end());
        return max(0, *mx - *mi - k * 2);
    }
};

Go Code
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func smallestRangeI(nums []int, k int) int {
	mi, mx := slices.Min(nums), slices.Max(nums)
	return max(0, mx-mi-k*2)
}

TypeScript Code
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function smallestRangeI(nums: number[], k: number): number {
    const max = nums.reduce((r, v) => Math.max(r, v));
    const min = nums.reduce((r, v) => Math.min(r, v));
    return Math.max(max - min - k * 2, 0);
}

Rust Code
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impl Solution {
    pub fn smallest_range_i(nums: Vec<i32>, k: i32) -> i32 {
        let max = nums.iter().max().unwrap();
        let min = nums.iter().min().unwrap();
        (0).max(max - min - k * 2)
    }
}