164. Maximum Gap

Given an unsorted array, find the maximum difference between the successive elements in its sorted form.

Return 0 if the array contains less than 2 elements.

Example 1:

Input: [3,6,9,1]
Output: 3
Explanation: The sorted form of the array is [1,3,6,9], either
             (3,6) or (6,9) has the maximum difference 3.

Example 2:

Input: [10]
Output: 0
Explanation: The array contains less than 2 elements, therefore return 0.

Note:

  • You may assume all elements in the array are non-negative integers and fit in the 32-bit signed integer range.
  • Try to solve it in linear time/space.

Rust Solution

struct Solution;

impl Solution {
    fn maximum_gap(mut nums: Vec<i32>) -> i32 {
        let n = nums.len();
        nums.sort_unstable();
        let mut res = 0;
        for i in 1..n {
            res = res.max(nums[i] - nums[i - 1]);
        }
        res
    }
}

#[test]
fn test() {
    let nums = vec![3, 6, 9, 1];
    let res = 3;
    assert_eq!(Solution::maximum_gap(nums), res);
}

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