1064. Fixed Point π
Description
Given an array of distinct integers arr
, where arr
is sorted in ascending order, return the smallest index i
that satisfies arr[i] == i
. If there is no such index, return -1
.
Example 1:
Input: arr = [-10,-5,0,3,7] Output: 3 Explanation: For the given array, arr[0] = -10, arr[1] = -5, arr[2] = 0, arr[3] = 3, thus the output is 3.
Example 2:
Input: arr = [0,2,5,8,17] Output: 0 Explanation: arr[0] = 0, thus the output is 0.
Example 3:
Input: arr = [-10,-5,3,4,7,9] Output: -1 Explanation: There is no such i that arr[i] == i, thus the output is -1.
Constraints:
1 <= arr.length < 104
-109 <= arr[i] <= 109
Follow up: The O(n)
solution is very straightforward. Can we do better?
Solutions
Solution 1
1 2 3 4 5 6 7 8 9 10 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
|