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Removing duplicate characters from a string?

Wed, 08/23/2006 - 20:52 — Pooja

What are the fastest solutions you know with the following conditions?

1) O(n) space
2) Constant space

‹ Implement the strncpy function All permutations of a given string. ›
Tue, 09/05/2006 - 19:46 — kallol

Removing duplicate characters from a string?

If u remove something , how the space can be constant ??