Given a string of distinct characters, print all possible strings of any length that can be formed from given string characters.
Input: abc Output: a b c abc ab ac bc bac bca cb ca ba cab cba acb Input: abcd Output: a b ab ba c ac ca bc cb abc acb bac bca cab cba d ad da bd db abd adb bad bda dab dba cd dc acd adc cad cda dac dca bcd bdc cbd cdb dbc dcb abcd abdc acbd acdb adbc adcb bacd badc bcad bcda bdac bdca cabd cadb cbad cbda cdab cdba dabc dacb dbac dbca dcab dcba
The generation of all strings include the following steps.
1) Generate all subsequences of given string.
2) For every subsequence ‘subs’, print all permutations of ‘subs’
Below is C++ implementation. It uses next_permutation function in C++.
a b ab ba c ac ca bc cb abc acb bac bca cab cba
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