81. Search in Rotated Sorted Array II
You are given an integer array nums sorted in ascending order (not necessarily distinct values), and an integer target.
Suppose that nums is rotated at some pivot unknown to you beforehand (i.e., [0,1,2,4,4,4,5,6,6,7] might become [4,5,6,6,7,0,1,2,4,4]).
If target is found in the array return its index, otherwise, return -1.
Example 1:
Input: nums = [2,5,6,0,0,1,2], target = 0 Output: true
Example 2:
Input: nums = [2,5,6,0,0,1,2], target = 3 Output: false
Constraints:
1 <= nums.length <= 5000-104 <= nums[i] <= 104numsis guaranteed to be rotated at some pivot.-104 <= target <= 104
Follow up: This problem is the same as Search in Rotated Sorted Array, where
nums may contain duplicates. Would this affect the run-time complexity? How and why?Rust Solution
struct Solution;
use std::cmp::Ordering::*;
impl Solution {
fn search(nums: Vec<i32>, target: i32) -> bool {
let n = nums.len();
if n == 0 {
return false;
}
let mut l = 0;
let mut r = n - 1;
while l < r {
let m = l + (r - l) / 2;
if nums[m] == target {
return true;
}
match nums[m].cmp(&nums[r]) {
Equal => {
r -= 1;
}
Less => {
if nums[m] < target && nums[r] >= target {
l = m + 1;
} else {
r = m;
}
}
Greater => {
if nums[m] > target && nums[l] <= target {
r = m;
} else {
l = m + 1;
}
}
}
}
nums[l] == target
}
}
#[test]
fn test() {
let nums = vec![2, 5, 6, 0, 0, 1, 2];
let target = 0;
let res = true;
assert_eq!(Solution::search(nums, target), res);
let nums = vec![2, 5, 6, 0, 0, 1, 2];
let target = 3;
let res = false;
assert_eq!(Solution::search(nums, target), res);
let nums = vec![1, 1];
let target = 0;
let res = false;
assert_eq!(Solution::search(nums, target), res);
let nums = vec![1, 3, 1, 1];
let target = 3;
let res = true;
assert_eq!(Solution::search(nums, target), res);
}
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