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[LeetCode] Find Minimum in Rotated Sorted Array 二分搜索
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e., 0 1 2 4 5 6 7
might become 4 5 6 7 0 1 2
).
Find the minimum element.
You may assume no duplicate exists in the array.
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Array Binary Search 二分查找的变形,比较神奇的是数列可能没有旋转,查找前判断下数列旋转了没有便可以应对。
#include <iostream>#include <vector>using namespace std;class Solution {public: int findMin(vector<int> &num) { int n = num.size(); if(n<2||num[0]<num[n-1]) return num[0]; int lft=0,rgt=n-1,mid=n-1; while(lft+1<rgt){ if(num[mid-1]>num[mid]) break; mid = (lft+ rgt)/2; cout<<lft<<" "<<mid<<" "<<rgt<<endl; if(num[lft]<num[mid]) lft=mid; else rgt=mid; mid = rgt; } return num[mid]; }};int main(){ vector<int> num{3,4,5,6,1,2}; Solution sol; cout<<sol.findMin(num)<<endl; return 0;}
[LeetCode] Find Minimum in Rotated Sorted Array 二分搜索
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