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679. 24 Game You are given an integer array cards of length 4. You have four cards, each containing a number in the range [1, 9]. You should arrange the numbers on these cards in a mathematical expression using the operators [‘+’, ‘-‘, ‘*’, ‘/‘] and the parentheses ‘(‘ and ‘)’ to get the value 24. You are restricted with the following rules: The division operator ‘/‘ represents real division, not integer division. For example, 4 / (1 - 2 / 3) = 4 / (1 / 3) = 12. Every operation done is b...