Skip to content

2905. Find Indices With Index and Value Difference II

Description

You are given a 0-indexed integer array nums having length n, an integer indexDifference, and an integer valueDifference.

Your task is to find two indices i and j, both in the range [0, n - 1], that satisfy the following conditions:

  • abs(i - j) >= indexDifference, and
  • abs(nums[i] - nums[j]) >= valueDifference

Return an integer array answer, where answer = [i, j] if there are two such indices, and answer = [-1, -1] otherwise. If there are multiple choices for the two indices, return any of them.

Note: i and j may be equal.

 

Example 1:

Input: nums = [5,1,4,1], indexDifference = 2, valueDifference = 4
Output: [0,3]
Explanation: In this example, i = 0 and j = 3 can be selected.
abs(0 - 3) >= 2 and abs(nums[0] - nums[3]) >= 4.
Hence, a valid answer is [0,3].
[3,0] is also a valid answer.

Example 2:

Input: nums = [2,1], indexDifference = 0, valueDifference = 0
Output: [0,0]
Explanation: In this example, i = 0 and j = 0 can be selected.
abs(0 - 0) >= 0 and abs(nums[0] - nums[0]) >= 0.
Hence, a valid answer is [0,0].
Other valid answers are [0,1], [1,0], and [1,1].

Example 3:

Input: nums = [1,2,3], indexDifference = 2, valueDifference = 4
Output: [-1,-1]
Explanation: In this example, it can be shown that it is impossible to find two indices that satisfy both conditions.
Hence, [-1,-1] is returned.

 

Constraints:

  • 1 <= n == nums.length <= 105
  • 0 <= nums[i] <= 109
  • 0 <= indexDifference <= 105
  • 0 <= valueDifference <= 109

Solutions

Solution 1

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
class Solution:
    def findIndices(
        self, nums: List[int], indexDifference: int, valueDifference: int
    ) -> List[int]:
        mi = mx = 0
        for i in range(indexDifference, len(nums)):
            j = i - indexDifference
            if nums[j] < nums[mi]:
                mi = j
            if nums[j] > nums[mx]:
                mx = j
            if nums[i] - nums[mi] >= valueDifference:
                return [mi, i]
            if nums[mx] - nums[i] >= valueDifference:
                return [mx, i]
        return [-1, -1]

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
class Solution {
    public int[] findIndices(int[] nums, int indexDifference, int valueDifference) {
        int mi = 0;
        int mx = 0;
        for (int i = indexDifference; i < nums.length; ++i) {
            int j = i - indexDifference;
            if (nums[j] < nums[mi]) {
                mi = j;
            }
            if (nums[j] > nums[mx]) {
                mx = j;
            }
            if (nums[i] - nums[mi] >= valueDifference) {
                return new int[] {mi, i};
            }
            if (nums[mx] - nums[i] >= valueDifference) {
                return new int[] {mx, i};
            }
        }
        return new int[] {-1, -1};
    }
}

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
class Solution {
public:
    vector<int> findIndices(vector<int>& nums, int indexDifference, int valueDifference) {
        int mi = 0, mx = 0;
        for (int i = indexDifference; i < nums.size(); ++i) {
            int j = i - indexDifference;
            if (nums[j] < nums[mi]) {
                mi = j;
            }
            if (nums[j] > nums[mx]) {
                mx = j;
            }
            if (nums[i] - nums[mi] >= valueDifference) {
                return {mi, i};
            }
            if (nums[mx] - nums[i] >= valueDifference) {
                return {mx, i};
            }
        }
        return {-1, -1};
    }
};

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
func findIndices(nums []int, indexDifference int, valueDifference int) []int {
    mi, mx := 0, 0
    for i := indexDifference; i < len(nums); i++ {
        j := i - indexDifference
        if nums[j] < nums[mi] {
            mi = j
        }
        if nums[j] > nums[mx] {
            mx = j
        }
        if nums[i]-nums[mi] >= valueDifference {
            return []int{mi, i}
        }
        if nums[mx]-nums[i] >= valueDifference {
            return []int{mx, i}
        }
    }
    return []int{-1, -1}
}

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
function findIndices(nums: number[], indexDifference: number, valueDifference: number): number[] {
    let [mi, mx] = [0, 0];
    for (let i = indexDifference; i < nums.length; ++i) {
        const j = i - indexDifference;
        if (nums[j] < nums[mi]) {
            mi = j;
        }
        if (nums[j] > nums[mx]) {
            mx = j;
        }
        if (nums[i] - nums[mi] >= valueDifference) {
            return [mi, i];
        }
        if (nums[mx] - nums[i] >= valueDifference) {
            return [mx, i];
        }
    }
    return [-1, -1];
}

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
impl Solution {
    pub fn find_indices(nums: Vec<i32>, index_difference: i32, value_difference: i32) -> Vec<i32> {
        let index_difference = index_difference as usize;
        let mut mi = 0;
        let mut mx = 0;

        for i in index_difference..nums.len() {
            let j = i - index_difference;

            if nums[j] < nums[mi] {
                mi = j;
            }

            if nums[j] > nums[mx] {
                mx = j;
            }

            if nums[i] - nums[mi] >= value_difference {
                return vec![mi as i32, i as i32];
            }

            if nums[mx] - nums[i] >= value_difference {
                return vec![mx as i32, i as i32];
            }
        }

        vec![-1, -1]
    }
}

Comments