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1064. Fixed Point (Easy)

Given an array A of distinct integers sorted in ascending order, return the smallest index i that satisfies A[i] == i.  Return -1 if no such i exists.

 

Example 1:

Input: [-10,-5,0,3,7]
Output: 3
Explanation: 
For the given array, A[0] = -10, A[1] = -5, A[2] = 0, A[3] = 3, thus the output is 3.

Example 2:

Input: [0,2,5,8,17]
Output: 0
Explanation: 
A[0] = 0, thus the output is 0.

Example 3:

Input: [-10,-5,3,4,7,9]
Output: -1
Explanation: 
There is no such i that A[i] = i, thus the output is -1.

 

Note:

1. 1 <= A.length < 10^4
2. -10^9 <= A[i] <= 10^9

Related Topics

[Array] [Binary Search]

Hints

Hint 1

Loop over the array and check the first index i such A[i] == i