Add: Brace Expansion

Author: openset

Diff for: problems/brace-expansion/README.md

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+<!--|@author    Openset <[email protected]>                           |-->
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+[< Previous](https://github.com/openset/leetcode/tree/master/problems/high-five "High Five")
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+[Next >](https://github.com/openset/leetcode/tree/master/problems/confusing-number-ii "Confusing Number II")
+
+## 1087. Brace Expansion (Medium)
+
+
+
+### Related Topics
+  [[Backtracking](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)]
+
+### Similar Questions
+  1. [Decode String](https://github.com/openset/leetcode/tree/master/problems/decode-string) (Medium)
+  1. [Letter Case Permutation](https://github.com/openset/leetcode/tree/master/problems/letter-case-permutation) (Easy)
+
+### Hints
+<details>
+<summary>Hint 1</summary>
+All generated strings are of the same size. How can we generate all of these strings?
+</details>
+
+<details>
+<summary>Hint 2</summary>
+Do a backtracking on which each level of it has to choose one single (e.g. 'a') character or any character of the given parenthesized group (e.g. "{a,b,c}")
+</details>