Problems from Criterion 2021 Round 12

These problems are from a contest organized by Furqan Software on April 9, 2021 at 10:00 AM UTC See details...

Standings
A. Nearest Co-Prime
Two numbers are relatively prime or co-prime if their greatest common divisor is 1. In this problem,...
B. Melencolia I
According to Wikipedia, Albrecht Dürer (May 21, 1471 - April 6, 1528) was a German painter, printma...
C. GCD and Sum
Congratulations! You’ve been hired in “Buggy Software Ltd.” And you’ve been already given your first...
D. Pile of Crabs
There is a pile of crabs standing on one top of another. There are total N crabs numbered 1 to N. T...
E. Betting Business
You have opened a new betting business. You have decided that you will accept bets on the upcoming C...
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