algorithm - Printing lexicographically sorted subsets from a given string -

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for ex - if string "abc", answer should ab abc ac b bc c (only lexicographically smallest combination set of characters should appear) have solved problem string containing 15 or more characters, taking lot of time. how can reduce running time of algorithm? here , n length of string. here code:

            int n = int.parse(console.readline());             var str = console.readline();             string coll = string.empty;             coll = coll + " " + str[0];             (int j = 1; j < n; j++)             {                 var items = coll.split(' ');                 foreach (var item in items)                 {                     coll = coll + " " + item+str[j];                 }             }             var tt = coll.split(' ').orderby(a => a);             foreach (var item in tt)                 if (!string.isnullorempty(item))                     console.writeline(item);

for string of length n, there 2^n possible subsets. if each of subsets needs printed, can't around exponential complexity.


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