[LeetCode] 24 Game 二十四点游戏

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You have 4 cards each containing a number from 1 to 9. You need to judge whether they could operated through */+-()to get the value of 24.

Example 1:

Input: [4, 1, 8, 7]
Output: True
Explanation: (8-4) * (7-1) = 24

 

Example 2:

Input: [1, 2, 1, 2]
Output: False

 

Note:

  1. The division operator / represents real division, not integer division. For example, 4 / (1 - 2/3) = 12.
  2. Every operation done is between two numbers. In particular, we cannot use - as a unary operator. For example, with [1, 1, 1, 1] as input, the expression -1 - 1 - 1 - 1 is not allowed.
  3. You cannot concatenate numbers together. For example, if the input is [1, 2, 1, 2], we cannot write this as 12 + 12.

 

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