如何从数字数组中获取有关子序列的信息？

Question

我有一个数字数组 (C#)：

int[] seq = new[] { 2, 1, 4, 2, 1, 3, 
0, 0, 0, 0, 0, 
1, 5, 2, 3, 7, 
0, 0, 0, 
1, 2, 3, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

对于上面的序列，我需要这样的东西：

"Group1" - [0, 0, 0, 0, 0]
"Group2" - [0, 0, 0]
"Group3" - [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Answer 1

现在无法编译，但我猜……这样应该可以工作...

var prev = seq[0];
var subseq = new List<int> { prev };

var retVal = new List<List<int>>();

for (var i = 1; i < seq.Length; i++)
{
    if (seq[i] == prev)
    {
        subseq.Add(seq[i]);
    }
    else
    {
        if (subseq.Count() > 1) 
        {
            retVal.Add(subseq);
        }

        subseq = new List<int>();
    }
}

Answer 2

您似乎在将连续的零分组。我会将您的结果存储在 Dictionary<string, List<int>> 中，您必须知道当您找到一个零时，您会创建一个新组，并且每个连续的零都将属于同一组，直到序列被破坏。然后在找到下一个零时开始一个新组，依此类推。

类似于：

int[] seq = new[] { 
    2, 1, 4, 2, 1, 3, 
    0, 0, 0, 0, 0, 
    1, 5, 2, 3, 7, 
    0, 0, 0, 
    1, 2, 3, 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

bool newGroup = false;
Dictionary<string, List<int>> groups = new Dictionary<string, List<int>>();
foreach (int t in seq)
{
    if (t == 0)
    {
        if (!newGroup)
        {
            groups.Add(String.Format("Group{0}", groups.Count + 1), new List<int>());
            newGroup = true;
        }
        groups[groups.Keys.Last()].Add(t);
    }
    else
    {
        newGroup = false;
    }
}

groups.Keys.ToList().ForEach(k => Console.WriteLine("Key {0}: Value: {1}", k, String.Join(", ", groups[k])));

结果：

Key Group1: Value: 0, 0, 0, 0, 0
Key Group2: Value: 0, 0, 0
Key Group3: Value: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

如何从数字数组中获取有关子序列的信息？

How to get information about subsequences from the array of numbers?

c#

arrays

grouping

subsequence