Use a stack to enumerate all permutations of a string. Suppose you want to find all permutations of the string meat. Push the string +meat on the stack. While the stack is not empty Pop off the top of the stack. If that string ends in a + (such as tame+) Remove the + and add the string to the list of permutations. Else Remove each letter in turn from the right of the +. Insert it just before the +. Push the resulting string on the stack. For example, after popping e+mta, you push em+ta, et+ma, and ea+mt
Use a stack to enumerate all permutations of a string. Suppose you want to find all permutations of the string meat. Push the string +meat on the stack. While the stack is not empty Pop off the top of the stack. If that string ends in a + (such as tame+) Remove the + and add the string to the list of permutations. Else Remove each letter in turn from the right of the +. Insert it just before the +. Push the resulting string on the stack. For example, after popping e+mta, you push em+ta, et+ma, and ea+mt
C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter18: Stacks And Queues
Section: Chapter Questions
Problem 15SA
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Use a stack to enumerate all permutations of a string. Suppose you want to find all permutations of the string meat.
Push the string +meat on the stack.
While the stack is not empty
Pop off the top of the stack.
If that string ends in a + (such as tame+)
Remove the + and add the string to the list of permutations.
Else
Remove each letter in turn from the right of the +.
Insert it just before the +.
Push the resulting string on the stack.
For example, after popping e+mta, you push em+ta, et+ma, and ea+mt.
in java.
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