11.3 Given a sorted array of n integers that has been rotated an unknown number of times, write code to find an element in the array. You may assume that the array was originally sorted in increasing order.
EXAMPLE
Input: find 5 in {15, 16, 19, 20, 25, 1, 3, 4, 5, 7, 10, 14}
Output: 8 (the index of 5 in the array)
LeetCode上的原题，请参见我之前的博客Search in Rotated Sorted Array 在旋转有序数组中搜索和Search in Rotated Sorted Array II 在旋转有序数组中搜索之二。
class Solution { public: int search(vector<int> nums, int target) { int left = 0, right = nums.size() - 1; while (left <= right) { int mid = left + (right - left ) / 2; if (nums[mid] == target) return mid; else if (nums[mid] < nums[right]) { if (nums[mid] < target && nums[right] >= target) left = mid + 1; else right = mid - 1; } else if (nums[mid] > nums[right]) { if (nums[left] <= target && nums[mid] > target) right = mid - 1; else left = mid + 1; } else --right; } return -1; } };
本文转自博客园Grandyang的博客，原文链接：在旋转有序矩阵中搜索[CareerCup] 11.3 Search in Rotated Sorted Array ，如需转载请自行联系原博主。