Share your favourite I will try solving them .

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Share your favourite I will try solving them .

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This, and this.

Enjoy solving!

thanks for sharing. I solved them before

I really enjoyed the first problem, thx for sharing!! (second one I had already solved)

1977C - Nikita and LCM beats them all

D from the same contest is probably the highest quality problem in the 2300 range

oh sure I will try it

thanks for sharing

cute

1968F - Отрезки с равным XOR the best problem as i ever seen

thanks for sharing

This problem is roughly the same idea

this one is out of range (1900) 1714F - Build a Tree and That Is It.

these are in range:

1528A - Parsa's Humongous Tree

1056D - Decorate Apple Tree

103B - Cthulhu

2001C - Guess The Tree

thanks for sharing

hmm I wonder what this guys favorite topic is...

1800: C. A Mist of Florescence

Hint(not really)An ad-hoc problem, I enjoyed the editorial comments because people came up with more than 10 ways to solve the problem and my method was one of the most beautiful.

thanks for sharing

this and this

thanks for sharing

This is my personal list of fav problems, sorry but all problems are from 2000-2400 rating range but nonetheless they are great.

General Lessoncp concepts are very limited always try to think of topics for a sec and you'll get it right by your logic (piggybacked by your intuition)

1993D - Med-imize

LessonSimple mix of binary search + DP, DP logic is also cool and simple

1992G - Ultra-Meow

LessonSimple reverse thinking for exhaustive search using basic PnC

2002D2 - DFS Checker (Hard Version)

LessonHow to use tin and tout for a generic tree and check if u is ancestor of v or not.

2002E - Cosmic Rays

LessonSimple use of stack for maintaining order (similar to sliding window maximum)

Find Kth smallest pair distance in an array: Leetcode HARD (but simple bs actually)

LessonDouble binary search n(logn)^2

2000G - Call During the Journey

Lesson:Simple Dijkstra, but from the n-1 to 0 with simple modified logic.

Also, sometimes in modified dijkstra when there could be multiple redundant entries, using a set will save you from TLE.

2008H - Sakurako's Test

LessonPre computation OR dp is necessary to not get TLE, harmonic complexity is cool. BS on range is also cool.

thanks for sharing

I like your list. These are some questions that can be implemented within 10 minutes, if one gets the logic right.

2004D - Colored Portals

thanks for sharing

easiest 1600 rated problem I have ever done

Enjoy tle 1771C - Hossam and Trainees

Solved it before. Thanks for sharing

1083A - The Fair Nut and the Best Path

1151D - Stas and the Queue at the Buffet

Thanks for sharing

1983D - Swap Dilemma 1851F - Lisa and the Martians 1872E - Data Structures Fan 1556D - Take a Guess 2001C - Guess The Tree 816B - Karen and Coffee 2002D1 - DFS Checker (Easy Version) 1791F - Range Update Point Query 1999F - Expected Median 1997D - Maximize the Root I hope you enjoy these.

Thanks for sharing

Nice idea for practice

G. Path Queries

thanks for sharing

really enjoyed solving it

1950E - Nearly Shortest Repeating Substring, 1999F - Expected Median

Also out of range problems: 2000H - Ksyusha and the Loaded Set, 446C - DZY Loves Fibonacci Numbers, 1155E - Guess the Root.

Thanks for sharing

https://atcoder.jp/contests/abc370/tasks/abc370_e

https://mirror.codeforces.com/contest/1793/problem/D

https://mirror.codeforces.com/contest/1741/problem/E

Thanks for sharing

https://mirror.codeforces.com/contest/1971/problem/G https://mirror.codeforces.com/contest/1850/problem/G https://mirror.codeforces.com/contest/1971/problem/E https://mirror.codeforces.com/problemset/problem/1932/E https://mirror.codeforces.com/problemset/problem/1926/E https://mirror.codeforces.com/problemset/problem/1907/E

Thanks for sharing

1600 1800 1600

SpoilerWill share more if remember any. I have few favs higher rated than 1800

thanks for sharing, you can share higher rating problems too just add a rating to it

1700

QuestionDo you get notified when i update my comment?

yeah i got notified

I think this one is a nice dp. https://mirror.codeforces.com/contest/446/problem/A

thanks for sharing

hide it it s a spoil to the problem

Sorry, this one is out of the range, but It's one of the high quality problems that you would

reallyenjoy thinking and reaching the solution all by yourself.thanks for sharing I will try it

thanks for this post <3

Literally, 1937C - Bitwise Operation Wizard is the best one I've ever seen.

Thanks for sharing

1985G - D-Function. I read the formula they proved in the editorial after i solved it by generating some of the first numbers and learn the rules

And yes it works :) solving this problem is probably the best advancement i've made

thanks for sharing

Fox and names

Thanks for sharing

1777C - Quiz Master

Thanks for sharing

this aaaand this one

thanks for sharing

the best problem I've ever solved on codeforces.

https://mirror.codeforces.com/contest/1284/problem/C

thanks for sharing

Here you go https://mirror.codeforces.com/contest/1658/problem/D1

thanks for sharing

this one is really good :)

this

thanks for sharing

i solved it really good problem

Found this interesting. enjoy

I would recommend looking for problems in this range on C2Ladders https://c2-ladders-juol.onrender.com

thanks for sharing

1879D - Sum of XOR Functions

Found it very interesting and educational.

You can also try this 1398C - Good Subarrays, as this uses roughly the similar core concept.

thanks for sharing

some good problems are shared

This one is wonderful https://mirror.codeforces.com/contest/1851/problem/F

thanks for sharing

https://mirror.codeforces.com/problemset/problem/993/A geometry problem

Thanks for sharing

Gotta be 2013D - Minimize the Difference

Thanks for sharing

https://mirror.codeforces.com/problemset/problem/1969/C

A fabulous DP problem.

Thanks for sharing

This one and This one both of them are really good the first is of DP and the second one is interactive

Thanks for sharing

1995B2 - Bouquet (Hard Version)

Thanks for sharing

Probablity

thanks for sharing

https://mirror.codeforces.com/contest/1884/problem/C best observation problem i have seen