#Leetcode# 81. Search in Rotated Sorted Array II

Posted 2021-02-16 丧心病狂工科女

https://leetcode.com/problems/search-in-rotated-sorted-array-ii/

 

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.

(i.e., [0,0,1,2,2,5,6] might become [2,5,6,0,0,1,2]).

You are given a target value to search. If found in the array return true, otherwise return false.

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

Follow up:

• This is a follow up problem to Search in Rotated Sorted Array, where numsmay contain duplicates.
• Would this affect the run-time complexity? How and why?

代码：

class Solution {
public:
    bool search(vector<int>& nums, int target) {
        vector<int> ans;
        int t = target;
        if(target == 0) ans.push_back(0);
        while(target) {
            ans.push_back(target % 10);
            target /= 10;
        }
        sort(ans.begin(), ans.end());
        int n = nums.size();
        map<int, int> vis;
        for(int i = 0; i < n; i ++)
            vis[nums[i]] ++;
        if(t > 10) {
            for(int i = 0; i < n; i ++) 
                if(nums[i] == t) return true;
            
            return false;
        } 
        
        for(int i = 0; i < ans.size(); i ++) {
            vis[ans[i]] --;
            if(vis[ans[i]] < 0) return false;
        }
        return true;
    }
};

　　FH