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推廣網站開發,包含 Laravel 和 Kotlin 後端撰寫、自動化測試、讀書心得等。Taiwan Kotlin User Group 管理員。

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Hi, here's your problem today. This problem was recently asked by Google:

Given a mathematical expression with just single digits, plus signs, negative signs, and brackets, evaluate the expression. Assume the expression is properly formed.

Example:

Input: - ( 3 + ( 2 - 1 ) )
Output: -4

Here's the function signature:

def eval(expression):
  # Fill this in.

print eval('- (3 + ( 2 - 1 ) )')
# -4