LeetCode 旋轉數組兩道題 33+80+154 尋找旋轉排序數組中的最小值 II

搜尋旋轉排序數組

搜尋旋轉排序數組 II

class Solution {
public:
    bool search(vector<int>& nums, int target) {
       int len = nums.size();
        int low = 0;
        int high = len - 1;
        int mid;
        while (low <= high)
        {
            while (low < high&&nums[low] == nums[low + 1])
                ++low;
            while (low < high&&nums[high] == nums[high - 1])
                --high;

            mid = (low + high) / 2;
            if (nums[mid] == target)
                return true;
            if (nums[mid] > nums[high])//遞增數組在前面
            {
                if (nums[low] <= target&&target < nums[mid])
                    high = mid-1;
                else
                    low = mid + 1;
            }
            else//遞增數組在後面
            {
                if (nums[mid] < target&&target <= nums[high])
                    low = mid + 1;
                else
                    high = mid-1;
            }
        }
        return false;
    }
};
           

尋找旋轉排序數組中的最小值 II

class Solution {
public:
    int findMin(vector<int>& nums) {
        //使用的是while消除重複字元
        int len=nums.size();
        int low=0;
        int high=len-1;
        int mid;
        while(low<high)
        {
            while(low<high&&nums[low]==nums[low+1])
                ++low;
            while(low<high&&nums[high]==nums[high-1])
                --high;
            mid=(low+high)/2;
            if(nums[mid]>nums[high])
                low=mid+1;
            else
                high=mid; 
        }
        return nums[low];
    }
};