You can build dynamic functions with a nested function by passing different parameters into it. This technique of using the values of outside parameters within a dynamic function is called closures. For example,
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Global Variable
In Python, a variable declared outside of the function or in global scope is known as global variable. This means, global variable can be accessed (read) inside or outside of the function.
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Question
Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (floating point number). Given some queries, return the answers. If the answer does not exist, return -1.0.
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Question
Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist in the array.
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Question
Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times.
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