查找和排序

题目描述

把一个数组最开始的若干个元素搬到数组的末尾,我们称之为数组的旋转。
输入一个非递减排序的数组的一个旋转,输出旋转数组的最小元素。
例如数组{3,4,5,1,2}为{1,2,3,4,5}的一个旋转,该数组的最小值为1。
NOTE:给出的所有元素都大于0,若数组大小为0,请返回0。
 

解答:

Javascript解答:

function minNumberInRotateArray(rotateArray)

{
  if(rotateArray.length == 0){
    return 0;
  }
  for(var i = 0 ; i < rotateArray.length - 1; i ++){
    if(rotateArray[i+1] < rotateArray[i]){
      return rotateArray[i + 1];
    }
  }

}
module.exports = {
  minNumberInRotateArray : minNumberInRotateArray;
};

 

Java解答:

import java.util.ArrayList;

public class Solution {
    public int minNumberInRotateArray(int [] array) {
          if(array.length==0){
          return 0;
        }
        if(array.length==1){
          return array[0];
        }
         for(int i=0;i<array.length-1;i++){
          if(array[i]>array[i+1]){
               return array[i+1];
          }else{
                if(i==array.length-2){
               return array[0];
             }
              }
        }
         return 0;
    }
}
 

C++解答:

class Solution {
  public:
    int minNumberInRotateArray(vector<int> rotateArray) {
       sort(rotateArray.begin(),rotateArray.end());
         
        return rotateArray[0];
         
    }
};

C#解答:

class Solution
{
    public int minNumberInRotateArray(int[] rotateArray)
    {
        if(rotateArray==null||rotateArray.Length==0)
            return 0;
        int low=0;
        int high=rotateArray.Length-1;
        int mid=0;
        while(rotateArray[low]>=rotateArray[high])
        {
            if(high-low==1)
            {
                mid=high;
                break;
            }
            mid=(low+high)/2;
             
             if((rotateArray[low]==rotateArray[mid])&&
               (rotateArray[low])==rotateArray[high])
            {
                return GetMinByOrder(rotateArray);
            }
             
            if(rotateArray[low]<=rotateArray[mid])
            {
                //左边有序
                low=mid;
            }
            else
            {
                //右边有序
                high=mid;
                 
            }
            
        }
        return rotateArray[mid];
    }
     
    private int GetMinByOrder(int[] array)
    {
        int min=array[0];
        foreach(int item in array)
        {
            if(item<min)
                min=item;
        }
        return min;
    }
}
 

Python解答:

# -*- coding:utf-8 -*-
class Solution:
    def minNumberInRotateArray(self, rotateArray):
        # write code here
        pre = -7e20
        for num in rotateArray:
            if num < pre :
                return num
            pre = num
             
        if len(rotateArray) == 0:
            return 0
        return rotateArray[0]
posted @ 2016-12-07 15:56  稼轩  阅读(130)  评论(0编辑  收藏  举报