Codeforces-solutions/TODO.md

TODO list

List of unsolved problems that I should try again later. Putting everything here to clean my tabs

Codeforces

Problem from codeforces.

Divs

Official divs from codeforces

• Educational

  • F. Frogs and Mosquitoes

    I have no clue where to even start.

  • E. Water Taps

    I have an idea, but it's really annoying to solve it.

  • F. Fibonacci String Subsequences

    Obviously DP, but not sure how to do it...

  • F. Imbalance Value of Tree

    Tree problem, looks interesting.

  • F. Clear The Matrix

    DP with optimization?

  • D. Sums of Segments

    Another problem that I didn't have time to finish...

  • D. Smithing Skill

    Yet another problem I couldn't solve on time.

  • D1. Removal of a Sequence (Easy Version)

    A josephus problem, I'm gonna need to remember how it works to maka this.

• Global

  • E. Journey

    A problem from the global round that I couldn't do during the contest, it's seems to be about reconstruction tree, I'll have to see about it.

• Div 1/2

  • D. Division Versus Addition

    The idea is simple, but I have to think through it better.

  • D2. Inversion Graph Coloring

    DP with optimization.

  • E. Yet Another MEX Problem

    Maybe MEX with two pointers?

  • D. A Cruel Segment's Thesis

    Looks greedy.

  • F. Flint and Steel

    I tried this a long time ago, don't remember what it's about, just remembered that I tried a greedy solution and it didn't work.

  • C. Music Festival

    Looks like DP.

  • C1. Maple and Tree Beauty (Easy Version)

    I finished with one type of knapsack, but apparently there's a better way to do it that's going to be used to optimize later.

  • D1. Hot Start Up (easy version)

    DP, but couldn't do during the simulation...

  • D. Birthday Gift

    Another interesting problem that I couldn't do on time.

  • C. How Does the Rook Move?

    Combinatory problem, managed to get close to the answer but apparently the equation is still wrong, need to find the error.

  • C2. Hacking Numbers (Medium Version)

    Math problem, I feel like I'm closer to an answer.

  • C. Freedom of Choice

    Doesn't look impossible, but I'm not sure what to do on it, I'll check it out in the future.

• Div 3

  • G. Cry Me a River

    Graph problem, don't remember the details.

  • XORificator 3000

    I had an idea, but didn't have time to implement it.

  • F. Programming Competition

    Lack of time... Again.

  • F. Rae Taylor and Trees (hard version)

    I tried doing it during a simulation but my head didn't want to help me, I have to do it eventually when I feel better.

• Div 4

  • F. Gravity Falls

    I barely read it, not sure were I found it either, but looks pretty easy.

GYM

Gym from simulations or contests that I did

• ICPC Brazil first phase

  • D. Dominoes

    If I did this one, I would have passed into second phase, must try to solve it ASAP.

• ICPC Northwestern European Regional

  Link because it has no problem page in gym.

  • L. Last Guess

    I think I can solve it with max flow.

• USP Try-outs

  • B. Tuk-Tuk Express

    I have NO clue why my code keeps getting WA, awful implementation problem.

  • J. Apep, the Lord of Chaos

    I don't remember what the problem was about, I just know that I tried it before.

• think-cell round 1

  • C. Lexicographically Largest

    I'll be honest, I just got bored in the middle.

• 2022-2023 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred)

  • A. Amazing Trick

    Once again, didn't finish in time, I didn't even read it to be honest.

• Bubble Cup 9 - Finals [Online Mirror]

  • D. Dexterina’s Lab

    Got recomended to me.

Atcoder

• F. Operate K

  DP with optimization.

• F - Pyramid Alignment

  Looks like a good implementation problem.