leetcode-search-in-rotated-sorted-array
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leetcode-search-in-rotated-sorted-array
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轉(zhuǎn)載自:http://www.acmerblog.com/leetcode-solution-search-in-rotated-sorted-array-ii-6210.html
題目描述
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e.,0 1 2 4 5 6 7might become4 5 6 7 0 1 2).
You are given a target value to search. If found in the array return its index, otherwise return -1.
You may assume no duplicate exists in the array.
題目描述
我們要編寫一個類似二分搜索的程序,雖然給我們的數(shù)列是打亂的,但數(shù)列總體還是有規(guī)律的,數(shù)列類型可以分成兩種,像題目中說的那樣,一種是依次遞增的,另一種是把前半部分放到了后面, 我找到最容易理解的代碼如下,代碼中測試前半部分 // LeetCode, Search in Rotated Sorted Array II // 時間復(fù)雜度O(n),空間復(fù)雜度O(1) class Solution { public:bool search(int A[], int n, int target) {int first = 0, last = n;while (first != last) {const int mid = (first + last) / 2;if (A[mid] == target)return true;if (A[first] < A[mid]) {if (A[first] <= target && target < A[mid])last = mid;elsefirst = mid + 1;} else if (A[first] > A[mid]) {if (A[mid] < target && target <= A[last-1])first = mid + 1;elselast = mid;} else//skip duplicate onefirst++;}return false;} };
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