Thus, it takes O(N!) time to create every variant of a string. The reason is that we are randomly creating each of the n! permutations. This method's temporal complexity, where N is the string's length, is O(N!). Write your code here: Coding Playground Time complexity Void generatePermutationsHelper (string &str, int l, int r, vector &ans) We must sort the list in order to get the permutations in lexicographically increasing order. Go back and switch Str and Str once again.īy the time we're done, the list "ans" will include every possible combination of the supplied string.To obtain the permutation of the remaining characters, call generatePermutaionsHelper(Str, l + 1, r).To correct the "ith" character on the index "l," swap Str and Str.If not, keep repeating the string from "l" to "r.".A new permutation is discovered if "l" equals "r." Put this string in the list of "ans.". The permutations of the substring produced by this function start at index "l" and end at index "r." Invoking the generatePermutaionsHelper method mentioned above (Str, l, r).
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