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Codeforces Round #861 (Div. 2) Разбор
By kartel, history, 22 months ago, translation, In English

1808A - Lucky Numbers

Solution

1808B - Playing in a Casino

Solution

1808C - Unlucky Numbers

Solution

1808D - Petya, Petya, Petr, and Palindromes

Solution

1808E1 - Minibuses on Venus (easy version)

Solution

1808E2 - Minibuses on Venus (medium version)

Solution

1808E3 - Minibuses on Venus (hard version)

Solution

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Codeforces Round #843 (Div. 2) Editorial
By kartel, history, 2 years ago, translation, In English

1775A1 - Gardener and the Capybaras (easy version)

Solution

1775A2 - Gardener and the Capybaras (hard version)

Solution

1775B - Gardener and the Array

Solution

1775C - Interesting Sequence

Solution

1775D - Friendly Spiders

Solution

1775E - The Human Equation

Solution

1775F - Laboratory on Pluto

Solution

Now it is time for the bonus task and author solutions!

Bonus
Bonus answer
Code for Problem A (solution for large alphabet)
Code for Problem B
Code for Task C
Code for Task D
Code for Task E
Code for Task F

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Congratulations!!!!
By kartel, history, 3 years ago, In English

I congratulate YouKn0wWho for breaking into the top-1 of contribution with the help of the best and most useful blogs.

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