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Problem Statement Fox Ciel has a cube

 15/10/19, 8)43 pm

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Problem Statement
Fox Ciel has a cube and some colored stickers. You are given a String[] sticker, where the i-th
element is the color of the i-th sticker. Ciel wants to choose six of these stickers and apply one on each
of the cube's faces. Each pair of adjacent faces must have different colors. Two faces are considered
adjacent if they share an edge.
If this is possible, return "YES", otherwise, return "NO" (all quotes for clarity).
Definition
Class: CubeStickers
Method: isPossible
Parameters: String[]
Returns: String
Method signature: String isPossible(String[] sticker)
(be sure your method is public)
Constraints
- sticker will contain between 6 and 50 elements, inclusive.
- Each element of sticker will contain between 1 and 10 lowercase letters ('a'-'z'), inclusive.
Examples
0)
{"cyan","magenta","yellow","purple","black","white","purple"}
Returns: "YES"
One of the possible ways is shown in the following picture:
15/10/19, 8)43 pm
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1)
{"blue","blue","blue","blue","blue","blue","blue","blue","blue","blue"}
Returns: "NO"
2)
{"red","yellow","blue","red","yellow","blue","red","yellow","blue"}
Returns: "YES"
3)
{"purple","orange","orange","purple","black","orange","purple"}
Returns: "NO"
4)
{"white","gray","green","blue","yellow","red","target","admin"}
Returns: "YES"
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