change O(N) to O(n)
change O(N) to O(n)
Merge pull request #326 from sumnous/patch-3

change O(N) to O(n)
Merge pull request #325 from sumnous/patch-2

change O(N) to O(n)
Update 01.07.md
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Update 1.7：字符串的全排列.c
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