Check if the item in the List is incremental and not redundant

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I need to retain all the list that are redundant and not incremental. But my code so far is for the items that are redundant only

_lst.Add(new MSheetValue
                    {
                        Column = 1,
                        Line = "1",
                        Pdf = "PDF1"
                    });

                    _lst.Add(new MSheetValue
                    {
                        Column = 1,
                        Line = "1",
                        Pdf = "PDF1"
                    });

                    _lst.Add(new MSheetValue
                    {
                        Column = 1,
                        Line = "1",
                        Pdf = "PDF2"
                    });


                    _lst.Add(new MSheetValue
                    {
                        Column = 1,
                        Line = "2",
                        Pdf = "PDF2"
                    });

                    _lst.Add(new MSheetValue
                    {
                        Column = 1,
                        Line = "3",
                        Pdf = "PDF2"
                    });


                    _lst.Add(new MSheetValue
                    {
                        Column = 1,
                        Line = "1",
                        Pdf = "PDF3"
                    });

                    _lst.Add(new MSheetValue
                    {
                        Column = 1,
                        Line = "3",
                        Pdf = "PDF3"
                    });

Here is my code

var result = _lst.GroupBy(x => new { x.Line, x.Pdf })
               .Where(x => x.Skip(1).Any()).ToList();

and the result is

Column = 1,
Line = "1",
Pdf = "PDF1"

But i also need the list that are not incremental

so i also need this

Column = 1,
Line = "1",
Pdf = "PDF3"


Column = 1,
Line = "3",
Pdf = "PDF3"

How can i solve it. I tried searching for a solution and test what i've found but i can't solve it. it doesn't return what i expected

var distinctItems = _lst.Distinct();

To match on only some of the properties, create a custom equality comparer, e.g.:

class DistinctItemComparer : IEqualityComparer<Item> {

public bool Equals(Item x, Item y) {
    return x.Column == y.Column &&
        x.Line == y.Line &&
        x.Pdf == y.Pdf;
}

public int GetHashCode(Item obj) {
    return obj.Column.GetHashCode() ^
        obj.Line.GetHashCode() ^        
        obj.Pdf.GetHashCode();
}

}

Then use it like this:

var distinctItems = _lst.Distinct(new DistinctItemComparer());

Or try it:

var distinctItems = _lst.GroupBy(x => x.Id).Select(y => y.First());

Find the repeated elements in a list, Each time you see a number, increment the count at that index. The first matching characters have not been found. The function doesn't care if we pass it a list of numbers, or an iterable object, or a generator. None or 0; For every number in the array, check if the value in temp[i] is empty ( 0 or None ). With Copy if newer (incremental), ShareGate Desktop analyses your source and destination list or library to determine which items or documents should be copied or updated. The application considers a file a match when it has the same file name in the source and destination library.

using zip to get the adjacent items and then comparing the adjacent items and selecting the items that are not adjacent may do the trick. This example is a little oversimplified as you may want to compare the field with Pdfs as well. The Union adds the duplicates to the non-adjacents.

return _lst.Zip(_lst.Skip(1), (a, b) => new { a, b})
.Where(w => w.b.Line != w.a.Line + 1)
.Select(w => w.b)

.Union(_lst.GroupBy(x => new { x.Line, x.Pdf })
           .Where(x => x.Skip(1).Any()).ToList()
           .SelectMany(s => s));

Python: Find duplicates in a list with frequency count & index , Step 1: Get duplicate elements in a list with a frequency count If element exists in dict then increment its value else add it in dict For each elements it checks if the element exists in the dictionary keys or not,. If element does not exist in dictionary keys, then it adds the element as key in the dictionary with  SUBSCRIBE to my channel https://goo.gl/wN3c3p Have you ever had a friend yelled random numbers at you while you're counting values? Aside from wanting to toss your friend in a lake you'd like to

Using some handy extension methods:

public static class Ext {
    public static IEnumerable<(TKey Key, T Value)> ScanPair<T, TKey>(this IEnumerable<T> src, TKey seedKey, Func<(TKey Key, T Value), T, TKey> combine) {
        using (var srce = src.GetEnumerator()) {
            if (srce.MoveNext()) {
                var prevkv = (seedKey, srce.Current);

                while (srce.MoveNext()) {
                    yield return prevkv;
                    prevkv = (combine(prevkv, srce.Current), srce.Current);
                }
                yield return prevkv;
            }
        }
    }
    public static IEnumerable<IGrouping<int, TRes>> GroupByWhile<T, TRes>(this IEnumerable<T> src, Func<T, T, bool> test, Func<T, TRes> result) =>
        src.ScanPair(1, (kvp, cur) => test(kvp.Value, cur) ? kvp.Key : kvp.Key + 1).GroupBy(kvp => kvp.Key, kvp => result(kvp.Value));

    public static IEnumerable<IGrouping<int, TRes>> GroupBySequential<T, TRes>(this IEnumerable<T> src, Func<T, int> SeqNum, Func<T, TRes> result) =>
        src.GroupByWhile((prev, cur) => SeqNum(prev) + 1 == SeqNum(cur), result);
    public static IEnumerable<IGrouping<int, T>> GroupBySequential<T>(this IEnumerable<T> src, Func<T, int> SeqNum) => src.GroupBySequential(SeqNum, e => e);

    public static IEnumerable<T> DistinctBy<T, TKey>(this IEnumerable<T> src, Func<T, TKey> keyFun, IEqualityComparer<TKey> comparer = null) {
        var seenKeys = new HashSet<TKey>(comparer);
        foreach (var e in src)
            if (seenKeys.Add(keyFun(e)))
                yield return e;
    }

    public static int ToInteger(this string s) => Convert.ToInt32(s);
}

ScanPair is a variation of my APL inspired Scan operator (which is like Aggregate only returns the intermediate results). I discovered I was doing a lot of Scan with tuples to carry the original information, so ScanPair combines the intermediate results with the original values.

Using ScanPair, GroupByWhile runs a test on each element and groups while the test is true. Using GroupByWhile, GroupBySequential groups when each elements sequence number is sequential.

DistinctBy returns the distinct objects based on a key selection function. I cheat and use this rather than create an IEqualityComparer for MSheetValue.

Finally, ToInteger is just a handy extension for reading flow.

With these extension methods, processing the _lst is relatively straightforward:

var nonSeq = _lst.GroupBy(m => m.Pdf) // need to test each Pdf
                 .Select(mg => mg.GroupBySequential(m => m.Line.ToInteger())) // get the sequential groups
                 .Where(mg => mg.Count() > 1) // keep the ones with non-sequential lines
                 // parse each non-sequential group into just the unique entries and flatten
                 .Select(mg => mg.SelectMany(m => m).DistinctBy(m => new { m.Column, m.Line, m.Pdf }));

Non-Repeating Element, Find the first non-repeating element in a given array of integers. elements one by one and inner loop checks if the element is present more than once or not. Don't post the following: (A) requests for help finding games (except in the Help sticky) (B) referral links. (C) IGM or equivalent games. (D) Anything about your own game more than 1 time per week at most. Be nice No personal attacks, death threats, witch hunts, bigotry and the like.

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Find duplicates in O(n) time and O(1) extra space, Method 1 and Method 2 of the above link are not applicable as the question says O(n) So to find out the duplicate elements, a HashMap is required, but the question is to For every element,take its absolute value and if the abs(array[i])'​th element is For every element in the array increment the arr[i]%n'th element by n. 16) The data entry control that would best prevent entering an invoice received from a vendor who is not on an authorized supplier list is A) a validity check. B) an authorization check. C) a check digit. D) closed-loop verification.

array_unique - Manual, SORT_REGULAR - compare items normally (don't change types) e.g I want to create multi dimentional unique array for specific code Taking the advantage of array_unique, here is a simple function to check if an increment depth level In the case of items d, c, and e, the existing list of items does not exist, and a new list is created to store the PID value and the profit value of the product. However, in the case of the items a, g, h, and i, the existing item list exists, and the PID value is added and the profit value of the product is added.

Comments
  • Explain your not incremental point of view