GGn0 d8f573c0fb
Add solution to problem 74 (#3110)
* Add solution to problem 74

* Fix typo

* Edit unnecessary comment

* Rename folder, add default params in solution()

* Rename file to solve conflicts

* Fix doctests
2020-11-01 21:12:21 +08:00
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2020-11-01 21:12:21 +08:00