对奇数和偶数隔离列表中的奇数和偶数进行排序/分组



我有一个未排序的数字列表,带有偶数和奇数。我需要按排序顺序分隔奇数和偶数。

例如:

List = [5,6,4,7,11,14,12,1,3]

预期输出 :

[4,6,12,14,1,3,5,7,11]

我的程序是分离奇数和偶数。

L = [5,6,4,7,11,14,12,1,3]
def segregateEvenOdd(L):
    left,right = 0,len(L)-1
    while left < right:
        while (L[left]%2==0 and left < right):
            left += 1
        while (L[right]%2 == 1 and left < right):
            right -= 1
        if (left < right):
            L[left],L[right] = L[right],L[left]
            left += 1
            right = right-1
print segregateEvenOdd(L)
output : [12, 6, 4, 14, 11, 7, 5, 1, 3]

我正在尝试使用插入排序对列表进行排序,无法获得正确的输出。任何可以轻松排序的方法<</p>

div class="one_answers">

使用 list.sort/sorted 的关键函数:

>>> list(sorted(lst, key=lambda x: [x % 2, x]))
[4, 6, 12, 14, 1, 3, 5, 7, 11]

偶数n映射到值[0, n],奇数n映射到值[1, n],因此偶数根据列表项的自然顺序排在第一位,即 [0, ...]先于[1, ...].

添加到@fferi的答案.
如果你想要数后跟奇数,每个按升序排列,请执行以下操作:

>>> lst=range(10)
>>> sorted(lst, key = lambda x:(x%2, x))
[0, 2, 4, 6, 8, 1, 3, 5, 7, 9]

奇数后跟数,每个按升序排列

>>> sorted(lst, key = lambda x:(not x%2, x))
[1, 3, 5, 7, 9, 0, 2, 4, 6, 8]

数后跟奇数,每个按降序排列

>>> sorted(lst, key = lambda x:(not x%2, x), reverse=True)
[8, 6, 4, 2, 0, 9, 7, 5, 3, 1]

奇数后跟数,每个按降序排列

>>> sorted(lst, key = lambda x:(x%2, x), reverse=True)
[9, 7, 5, 3, 1, 8, 6, 4, 2, 0]
Short_list =[5,7,3,2,8,1,0,10,9,4,6]
def sort_list(my_list):
  even_list = []
  odd_list = []
  for i in my_list:
      if i % 2 == 0:
          even_list.append(i)
      else:
          odd_list.append(i)
  even_list.sort(),odd_list.sort()
  even_list.extend(odd_list)
  return even_list
print(sort_list(Short_list))

[0, 2, 4, 6, 8, 10, 1, 3, 5, 7, 9]

简单使用列表理解基础

>>> arr = [5,6,4,7,11,14,12,1,3]
>>> evens = sorted([e for e in arr if e % 2 ==0])
>>> odds = sorted([e for e in arr if e % 2 !=0])
>>> print(evens + odds)
[4, 6, 12, 14, 1, 3, 5, 7, 11]

我们可以首先对 n%2 (n 模 2( 进行排序,奇数为 0,偶数为 1,然后对数字本身进行排序:

L = [5,6,4,7,11,14,12,1,3]
out = sorted(L, key = lambda n:(n%2, n))
print(out)
# [4, 6, 12, 14, 1, 3, 5, 7, 11]

我们用作键的元组首先根据它们的第一个项目进行排序,然后根据它们的第二个项目进行排序。

它也适用于负数...

列出偶数和赔率列表,然后合并:

lst = [5,6,4,7,11,14,12,1,3]
even = sorted([i for i in lst if i%2 == 0])
odd = sorted([i for i in lst if i%2])
print(even + odd)

或者使用 filterlambda

lst = [5,6,4,7,11,14,12,1,3]
lst.sort()
even = list(filter(lambda x: not x%2, lst))
odd = list(filter(lambda x: x%2, lst))
print(even + odd)
如果您

愿意使用第三方库,则可以将布尔索引与numpy一起使用。

numpy.lexsort以相反的方式排序,即它在A之前考虑A % 2

import numpy as  np
A = np.array([4,6,12,14,1,3,5,7,11])
res = A[np.lexsort((A, A % 2))]
# [ 4  6 12 14  1  3  5  7 11]

相关:为什么是NumPy而不是Python列表?

如果您想

避免使用外部库,我建议您这样做:

def even_odd_sort(list):
evens=[]
odds=[]
for i in list:
    if(i%2==0):
        evens.append(i)
    else:
        odds.append(i)
evens.sort()
odds.sort()
return evens+odds
<</div> div class="one_answers">

一个简单的解决方案:

import numpy as np
l = [5,6,4,7,11,14,12,1,3]
l_sort = np.sort(l) #sorting elements of the list
evens = list(filter(lambda x: x%2==0, l_sort)) #extract even elements 
odds = list(filter(lambda x: x%2!=0, l_sort)) #extract odd elements
out = evens + odds 

该过程涉及在单独的临时列表中将值拆分为偶数和奇数,然后按升序对它们进行数字排序,最后将所有值放在一个列表中。下图显示了 C# 上的两个项目,一个包含所有过程,而第二个更实用,但该过程适用于你的项目。

步骤:

  • 将原始列表一分为二,一个用于偶数,另一个用于赔率。
  • 对于这两个列表,按升序对它们进行排序。
  • 现在将两个列表合并到一个列表中。

图-1

图-2

图-3

图-4

  • 这就是所有的 C# 代码,我希望这有所帮助,迟到总比没有好:


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            combodata1();
        }
        public void combodata1() {
            combo1.DataSource = new String[] {"5","10","15","20","25","30","35","40"};
        }
        private void button2_Click(object sender, EventArgs e)
        {
            generate();
        }
        List<String> li1 = new List<String>();
        List<String> li2 = new List<String>();
        List<String> li3 = new List<String>();
        List<String> li4 = new List<String>();
        List<String> li5 = new List<String>();
        public void generate() {
            li1.Clear();
            int r = Convert.ToInt32(combo1.SelectedValue)-1;
            Random ran = new Random();
            for(int i=0;i<=r;i++){
                int num1 = ran.Next(100);
                li1.Add(Convert.ToString(num1));
                                 }
            lista1.DataSource = null;
            lista1.DataSource = li1;
                               }
        private void button1_Click(object sender, EventArgs e)
        {
            String te1 = data1.Text;
            if (te1.Equals("") == false)
            {
                add();
            }
            else {
                MessageBox.Show("- You need to add integer numbers only, empty space or letters are not allowed.","Message");
            }
        }
        public void add() {
            String dato = data1.Text;
            li1.Add(dato);
            lista1.DataSource = null;
            lista1.DataSource = li1;
            data1.Text = "";
                              }
        private void button3_Click(object sender, EventArgs e)
        {          
            int n = lista1.Items.Count;
            if(n>0){
            split();
                   }
            else {
                MessageBox.Show("- Original List must present values.","Message");
                 }
        }
        public void split() {
            int n = lista1.Items.Count-1;
            for (int i = 0; i <= n;i++){
                double a = Convert.ToDouble(li1.ElementAt(i));
                double b = (a / 2);
                double c = b - Math.Floor(b);
                if (c == 0){
                    li2.Add(Convert.ToString(a));
                           }
                else {
                    li3.Add(Convert.ToString(a));
                     }
                                       }
            sort_evenly();
                              }
        public void sort_evenly() {
            int w = li2.Count;
            if (w > 0)
            {
                int n = li2.Count - 1;
                int a = Convert.ToInt32(li2.ElementAt(0));
                for (int i = 1; i <= n; i++)
                {
                    int b = Convert.ToInt32(li2.ElementAt(i));
                    if (a > b) { a = b * 1; }
                    if (a < b) { a = a * 1; }
                }
                li4.Add(Convert.ToString(a));
                li2.Remove(Convert.ToString(a));
                sort_evenly();
            }
            else {
                sort_oddly();
                 }
                                  }
        public void sort_oddly() {
            int w = li3.Count;
            if (w > 0)
            {
                int n = li3.Count - 1;
                int a = Convert.ToInt32(li3.ElementAt(0));
                for (int i = 1; i <= n; i++)
                {
                    int b = Convert.ToInt32(li3.ElementAt(i));
                    if (a < b) { a = a * 1; }
                    if (a > b) { a = b * 1; }
                }
                li5.Add(Convert.ToString(a));
                li3.Remove(Convert.ToString(a));
                sort_oddly();
            }
            else {
               sortedlist();
                 }
                                    }
        String even = "";
        String odd = "";
        String result = "";
        public void sortedlist() {
            even = "";
            odd = "";
            result = "";
            int n = li4.Count-1;
            int k = li5.Count-1;
            for(int i=0;i<=n;i++){
            String hyphen = "-";
            if(i==n){hyphen="";}
            even = even + Convert.ToString(li4.ElementAt(i)) + hyphen;
                                 }
            for(int i=0;i<=k;i++){
            String hyphen = "-";
            if(i==k){hyphen="";}
            odd = odd + Convert.ToString(li5.ElementAt(i)) + hyphen;
                                 }
            result = even + "-" + odd;
            res1.Text = result;
            li2.Clear();
            li3.Clear();
            li4.Clear();
            li5.Clear();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            clear();
        }
        public void clear() {
            li2.Clear();
            li3.Clear();
            li4.Clear();
            li5.Clear();
            res1.Text = "";
                               }
        private void button5_Click(object sender, EventArgs e)
        {
            clearall();
        }
        public void clearall() {
            data1.Text = "";
            li1.Clear();
            li2.Clear();
            li3.Clear();
            li4.Clear();
            li5.Clear();
            lista1.DataSource = null;
            res1.Text = "";
                              }
    }
}

在python中:

data = [100, 1, 2, 3, 4, 5, 6, 65, 89, 7, 8, 9, 10]
print(sorted([e for e in data if e % 2 == 0]) + sorted([e for e in data if e % 2 != 0]))

我的方法(长(:

 l=[4,1,2,3]
 # separate odd and even position elements
 ev=[]
 odd=[]
 for i in range(len(l)):
     if i%2==0:
         ev.append(l[i])
     else:
         odd.append(l[i])
 # sort them
 newev = sorted(ev)
 newodd= sorted(odd, reverse=True)
 # combine them
 comb=list(zip(newev, newodd))
 # append according to the order
 out=[]
 for i, v in enumerate(op):
     out.append(v[0])
     out.append(v[1])
 print(out)
 # [2,3,4,1]

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