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package com.hit.basmath.learn.binary_search;
/**
* 704. Binary Search
* <p>
* Given a sorted (in ascending order) integer array nums of n elements and a target value, write a function to search target in nums. If target exists, then return its index, otherwise return -1.
* <p>
* <p>
* Example 1:
* <p>
* Input: nums = [-1,0,3,5,9,12], target = 9
* Output: 4
* Explanation: 9 exists in nums and its index is 4
* <p>
* Example 2:
* <p>
* Input: nums = [-1,0,3,5,9,12], target = 2
* Output: -1
* Explanation: 2 does not exist in nums so return -1
* <p>
* <p>
* Note:
* <p>
* You may assume that all elements in nums are unique.
* n will be in the range [1, 10000].
* The value of each element in nums will be in the range [-9999, 9999].
*/
public class _704 {
public static int search(int[] nums, int target) {
if (nums == null || nums.length == 0) {
return -1;
}
int left = 0;
int right = nums.length - 1;
// binary search algorithm
while (left <= right) {
// unsigned right means divided 2's n square
int middle = (left + right) >>> 1;
// compare target element
if (nums[middle] < target) {
left = middle + 1;
} else if (nums[middle] > target) {
right = middle - 1;
} else {
return middle;
}
}
return -1;
}
public static void main(String[] args) {
int[] arr = {-3, -2, -1, 1, 2, 3};
System.out.println(search(arr, 2));
}
}
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