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I have a code like
string code = "AABBDDCCRRFF"; In this code, I want to retrieve only distinct characters
The Output should be like:
ANS: ABDCRF 
684
It means different characters. For example : 'a' and 'b' are distinct while 'a' and 'a' are same. So, a string say, “absgj” contains 5 distinct characters. Also string, “hello” contains only 4 distinct characters.
A unique string consists of characters that occur only once. To check for uniqueness, compare each character with the rest of the string. If a character is repeated, then the string is not unique.
First we will initialize all values of counter array to 0 and all values of index array to n (length of string). On traversal of the string str and for every character c, increase count[x], if count[x] = 1, index[x] = i. If count[x] = 2, index[x] = n. Sort indexes and print characters.
string code = "AABBDDCCRRFF"; string answer = new String(code.Distinct().ToArray()); Linq's Distinct returns distinct elements from a sequence. As the String class implements IEnumerable<char>, Distinct in this context returns an IEnumerable<char> containing all of the unique characters in the string.
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