Question

我有STAR，SUN，MOON（例子）的枚举

我有以下列表：

STAR,
SUN,
SUN,
SUN,
SUN,
SUN,
MOON,
STAR,
STAR,
STAR,
STAR,
STAR,
STAR,
STAR,
STAR,
STAR,
STAR,
STAR,
STAR,
MOON

我正在寻找一种方法来产生以下列表：

STAR,
SUN,
MOON,
STAR,
STAR,
MOON

如果我们有相同类型的1-5个元素，我们添加1个条目，如果我们有超过5个，我们添加数字/ 5或6，如果我们有15个卫星我们将3添加到新列表，如果我们有22个，我们加4，如果我们有30，我们加5等等

Answer 1

2个实现，选择你喜欢的那个。

首先（从原始列表中删除项目）：

// usage:
MyFilter(list);

// method:
static void MyFilter(List<MyEnum> list)
{
    int repetitions = 1;
    MyEnum repeatValue = list[0];
    int i = 1;
    while(i < list.Count) {
        MyEnum current = list[i];

        if(current == repeatValue) {
            repetitions++;
            if(repetitions>9 && repetitions%5==0)
                i++;
            else
                list.RemoveAt(i);
        } else {
            repetitions=1;
            repeatValue=current;
            i++;
        }
    }
}

第二个（建立一个新的清单）：

// usage:
list = MyFilter(list);

// method:
static List<MyEnum> MyFilter(List<MyEnum> list)
{
    List<MyEnum> result = new List<MyEnum>();

    int repetitions = 0;
    MyEnum? repeatValue = null;
    for(int i=0; i<=list.Count; i++) {
        MyEnum? current = null;
        if(i < list.Count) {
            current = list[i];

            if(repeatValue==null || current==repeatValue) {
                repetitions++;
                repeatValue=current;
                continue;
            }
        }

        if(repetitions <= 5) {
            result.Add(repeatValue.Value);
        } else {
            for(int j=repetitions/5; j>0; j--)
                result.Add(repeatValue.Value);
        }

        repetitions = 1;
        repeatValue = current;
    }

    return result;
}

Answer 2

你需要在找到第一项时输出值，然后跳过2到5.我用字典解决了

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace ConsoleApplication1
{
    class Program
    {

        static void Main(string[] args)
        {
            string[] input = { "STAR",
                                "SUN",
                                "SUN",
                                "SUN",
                                "SUN",
                                "SUN",
                                "MOON",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "STAR",
                                "MOON"
                             };
            Dictionary<string, int> dict = new Dictionary<string, int>();
            List<string> output = new List<string>();

            foreach (string str in input)
            {
                if (dict.ContainsKey(str))
                {
                    int count = dict[str];
                    if ((count % 5) == 0)
                    {
                        output.Add(str);
                    }
                    dict[str] += 1; 
                }
                else
                {
                    dict.Add(str, 0);
                }
            }

        }

    }
}

根据重复元素单独列出

2 个答案: