Fix bug
fix bug
Revert "fix bug"

This reverts commit bff10a6bf7fc4edcb87442cfa2239b5214b7171a.
Revert "Fix bug"

This reverts commit 2c5404e3dc01077a44bcbb5875431b766593648e.
Merge pull request #5 from Mooophy/master

SYN
Merge pull request #74 from pezy/master

Finished Chapter 7 refactor.
Merge pull request #6 from Mooophy/master

SYN
exercise 17.17
fix symbols in comment
fix stupid character mistake
Merge pull request #75 from Queequeg92/master

add exercise 17.17
A comment about the erase-remove idiom.
Merge pull request #77 from Queequeg92/master

A comment about the erase-remove idiom.
exercise 17.19.20
Merge pull request #78 from Queequeg92/master

exercise 17.19.20
exercise 8.13.14
exercise 17.21
Fix character mistake
Merge pull request #79 from Queequeg92/master

exercise 8.13.14
Merge remote-tracking branch 'upstream/master'