The Problem
Given an array
numsof 0s and 1s and an integerk, returnTrueif all 1's are at leastkplaces away from each other, otherwise returnFalse.
Example 1:
Input: nums = [1,0,0,0,1,0,0,1], k = 2
Output: true
Explanation: Each of the 1s are at least 2 places away from each other.
Example 2:
Input: nums = [1,0,0,1,0,1], k = 2
Output: false
Explanation: The second 1 and third 1 are only one apart from each other.
Example 3:
Input: nums = [1,1,1,1,1], k = 0
Output: true
Example 4:
Input: nums = [0,1,0,1], k = 1
Output: true
Constraints:
1 <= nums.length <= 10^50 <= k <= nums.length-
nums[i]is0or1
Tests
import pytest
from .Day25_CheckIfAll1sAreAtLeastLengthKPlacesAway import Solution
s = Solution()
@pytest.mark.parametrize(
"nums,k,expected",
[
([1,0,0,0,1,0,0,1], 2, True),
([1,0,0,1,0,1], 2, False),
([1,1,1,1,1], 0, True),
([0,1,0,1], 1, True)
],
)
def test_k_length_apart(nums, k, expected):
assert s.kLengthApart(nums, k) == expected
Solution
from typing import List
class Solution:
def kLengthApart(self, nums: List[int], k: int) -> bool:
current_dist = k
for n in nums:
if n == 1:
if current_dist < k:
return False
current_dist = 0
else:
current_dist += 1
return True
Analysis
Commentary
That one was easy. A little too easy....
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