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Diffstat (limited to 'search_rotated_array.cpp')
-rw-r--r-- | search_rotated_array.cpp | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/search_rotated_array.cpp b/search_rotated_array.cpp deleted file mode 100644 index 7001f32..0000000 --- a/search_rotated_array.cpp +++ /dev/null @@ -1,37 +0,0 @@ -// 33. Search in Rotated Sorted Array -#include "leetcode.h" - -/* - * there is an integer array 'nums' sorted in ascending order (with distinct - * values). prior to being passed to your function, 'nums' is possibly rotated - * at an unknown pivot index 'k(1 <= k < nums.length)' such tht the resulting - * array is '[nums[k], nums[k + 1], ..., nums[n - 1], nums[0], nums[1], ..., - * nums[k - 1]]' (0-indxed). for example, '[0,1,2,4,5,6,7]' might be rotated at - * pivot index 3 and become '[4,5,6,7,0,1,2]'. given the array 'nums' after the - * possible rotation and an integer 'target', return the index of 'target' if it - * is in 'nums', or -1 otherwise. you must write an algorithm with 'O(log n)' - * runtime complexity - */ - -class Solution { -public: - int search(vector<int> &nums, int target) { - int left = 0, right = nums.size() - 1; - while (left < right) { - int mid = (left + right) / 2; - if ((nums[0] > target) ^ (nums[0] > nums[mid]) ^ (target > nums[mid])) - left = mid + 1; - else - right = mid; - } - return left == right && nums[left] == target ? left : -1; - } -}; - -int main() { - Solution obj; - vector<int> n1 = {4, 5, 6, 7, 0, 1, 2}, n2 = {4, 5, 6, 7, 0, 1, 2}, n3 = {1}; - printf("%d\n", obj.search(n1, 0)); // expect: 4 - printf("%d\n", obj.search(n2, 3)); // expect: -1 - printf("%d\n", obj.search(n3, 0)); // expect: -1 -} |