220. Contains Duplicate III

Given an array of integers, find out whether there are two distinct indices i and j in the array such that the absolute difference between nums[i] and nums[j] is at most t and the absolute difference between i and j is at most k.

Example 1:

```Input: nums = [1,2,3,1], k = 3, t = 0
Output: true
```

Example 2:

```Input: nums = [1,0,1,1], k = 1, t = 2
Output: true
```

Example 3:

```Input: nums = [1,5,9,1,5,9], k = 2, t = 3
Output: false
```

Constraints:

• `0 <= nums.length <= 2 * 104`
• `-231 <= nums[i] <= 231 - 1`
• `0 <= k <= 104`
• `0 <= t <= 231 - 1`

220. Contains Duplicate III
``````struct Solution;
use std::collections::BTreeSet;

impl Solution {
fn contains_nearby_almost_duplicate(nums: Vec<i32>, k: i32, t: i32) -> bool {
let mut bts = BTreeSet::new();
let k = k as usize;
let n = nums.len();
if t < 0 {
return false;
}
for i in 0..n {
let l = nums[i].checked_sub(t).unwrap_or(std::i32::MIN);
let r = nums[i].checked_add(t).unwrap_or(std::i32::MAX);
if bts.range(l..=r).next().is_none() {
bts.insert(nums[i]);
} else {
return true;
}
if i >= k {
bts.remove(&nums[i - k]);
}
}
false
}
}

#[test]
fn test() {
let nums = vec![1, 2, 3, 1];
let k = 3;
let t = 0;
let res = true;
assert_eq!(Solution::contains_nearby_almost_duplicate(nums, k, t), res);
let nums = vec![1, 0, 1, 1];
let k = 1;
let t = 2;
let res = true;
assert_eq!(Solution::contains_nearby_almost_duplicate(nums, k, t), res);
let nums = vec![1, 5, 9, 1, 5, 9];
let k = 2;
let t = 3;
let res = false;
assert_eq!(Solution::contains_nearby_almost_duplicate(nums, k, t), res);
let nums = vec![-1, -1];
let k = 1;
let t = -1;
let res = false;
assert_eq!(Solution::contains_nearby_almost_duplicate(nums, k, t), res);
let nums = vec![7, 1, 3];
let k = 2;
let t = 3;
let res = true;
assert_eq!(Solution::contains_nearby_almost_duplicate(nums, k, t), res);
let nums = vec![0, 2_147_483_647];
let k = 1;
let t = 2_147_483_647;
let res = true;
assert_eq!(Solution::contains_nearby_almost_duplicate(nums, k, t), res);
}
``````