What is the most interesting problem you've seen in Codeforces? Send it in the comments. (If you send the link, write its name next to it).
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197B — Limit https://mirror.codeforces.com/problemset/problem/197/B
It is also an interesting problem for examining your calculus skills without using coding, make sure to check it out.
1714F - Build a Tree and That Is It
its interesting
4A - Watermelon
Dima and Lisa
it was about counting the numbers of string pairs that if they are merged we can make a palindrome from the merged string , we can rearrange the alphabet in the merged string in any arbitrary order I think it's a very well known problem I was fascinated by this problem I don't remember it's name
Kyoya and Permutation
Is one of my favorites, it seems weird at first but after giving it some time and think, it turns into a beautiful adhoc problem. I just love it when seemingly complex problems dissolve into familiar patterns.
1879D - Sum of XOR Functions, also the same idea: 1957D - A BIT of an Inequality
Others: 1945G - Cook and Porridge, 888G - Xor-MST
Also the Name of this problem: 1983E - I Love Balls
https://mirror.codeforces.com/contest/4/problem/A
Final Countdown
Problem C from https://mirror.codeforces.com/contest/1780
Sasha and the Casino