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Left path cloud recursion + dynamic planning
2022-07-07 02:54:00 【Zijin xiaofeixia】
recursive
Print all subsequences in the string
str = “abc”
Print
Print all subsequences in the string , No subsequence of repeated literals
Print all permutations of a string
Full Permutation : A string “abc" All characters in must be in different order
abc The whole arrangement
Example diagram of violent solution
Technical solution
Print all permutations of a string , Don't repeat the arrangement
You can also use the final result set Set save , But it has high efficiency without using shear directly ,set Is to filter in the final result set , Pruning is to directly filter out branches that do not need to be run
Data in the reverse stack cannot use additional memory
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