2025-06-24 Daily Challenge
Today I have done leetcode's June LeetCoding Challenge with cpp
.
June LeetCoding Challenge 24
Description
Find All K-Distant Indices in an Array
You are given a 0-indexed integer array nums
and two integers key
and k
. A k-distant index is an index i
of nums
for which there exists at least one index j
such that |i - j| <= k
and nums[j] == key
.
Return a list of all k-distant indices sorted in increasing order.
Example 1:
Input: nums = [3,4,9,1,3,9,5], key = 9, k = 1 Output: [1,2,3,4,5,6] Explanation: Here,nums[2] == key
andnums[5] == key. - For index 0, |0 - 2| > k and |0 - 5| > k, so there is no j
where|0 - j| <= k
andnums[j] == key. Thus, 0 is not a k-distant index. - For index 1, |1 - 2| <= k and nums[2] == key, so 1 is a k-distant index. - For index 2, |2 - 2| <= k and nums[2] == key, so 2 is a k-distant index. - For index 3, |3 - 2| <= k and nums[2] == key, so 3 is a k-distant index. - For index 4, |4 - 5| <= k and nums[5] == key, so 4 is a k-distant index. - For index 5, |5 - 5| <= k and nums[5] == key, so 5 is a k-distant index. - For index 6, |6 - 5| <= k and nums[5] == key, so 6 is a k-distant index.
Thus, we return [1,2,3,4,5,6] which is sorted in increasing order.
Example 2:
Input: nums = [2,2,2,2,2], key = 2, k = 2 Output: [0,1,2,3,4] Explanation: For all indices i in nums, there exists some index j such that |i - j| <= k and nums[j] == key, so every index is a k-distant index. Hence, we return [0,1,2,3,4].
Constraints:
1 <= nums.length <= 1000
1 <= nums[i] <= 1000
key
is an integer from the arraynums
.1 <= k <= nums.length
Solution
class Solution {
public:
vector<int> findKDistantIndices(vector<int>& nums, int key, int k) {
int current = 0;
int len = nums.size();
vector<int> answer;
for(int i = 0; i < len; ++i) {
if(nums[i] != key) continue;
for(current = max(current, i - k); current < min(len, i + k + 1); ++current) {
answer.push_back(current);
}
}
return answer;
}
};
// Accepted
// 87/87 cases passed (0 ms)
// Your runtime beats 100 % of cpp submissions
// Your memory usage beats 73.54 % of cpp submissions (14.7 MB)