Finding the Most Frequent Letter in a Text
You are given a text containing various English letters, digits and punctuation symbols. Your task is to find the most frequentl...
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Stern-Brocot Sequence
The Stern-Brocot diatomic sequence is defined as follows:
The first elements of the sequence are 0, 1, 1, 2, 1, 3, 2, 3, 1, 4...
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Maximizing Stock Profit
As a stock exchange broker focusing on a single transaction, your goal is to maximize profit by buying a stock at a low price an...
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问题
Minimize a quadratic function
Write a function to minimize the function . The coefficients a, b, and c will be positive. Give the coefficients in a vector coe...
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Hofstadter Q sequence
The Hofstadter G sequence is defined as follows:
The first elements of the sequence are 1, 1, 2, 3, 3, 4, 5, 5, 6, 6.
Write ...
Perfect shuffle
We call "perfect shuffle" the process of cutting a deck of cards into two equal halves, and then perfectly interleaving them: on...
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Battery Charge Indicator
Write a function called battery_charge that visually represents the charge of a battery.
The function takes an integer paramete...
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Find Next Strictly Greater Element
Given an array of numbers, create a new array where each element represents the next strictly greater element to the right of th...
Remove Unique Elements
Given a list of integers, we want to keep only the non-unique elements in this list. To do this, we need to remove all the uniqu...
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Absolute Sorting
Given an array with various numbers, your have to sort it by absolute value in ascending order.
For example, for the array [-2...
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Reverse Integer
You are given an integer, reverse its digits. For negative integers, the sign should remain in the front.
For instance, 12340 s...
Integer Persistence, Product
Let's construct a sequence as follows: is a given natural number, and is the product of the digits of . The persistence of i...