TODO list

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

Codeforces

Problem from codeforces.

Official divs from codeforces

Educational
1. F. Frogs and Mosquitoes
  
  I have no clue where to even start.
2. E. Water Taps
  
  I have an idea, but it's really annoying to solve it.
3. F. Fibonacci String Subsequences
  
  Obviously DP, but not sure how to do it...
4. F. Imbalance Value of Tree
  
  Tree problem, looks interesting.
5. F. Clear The Matrix
  
  DP with optimization?
Div 1/2
1. D. Division Versus Addition
  
  The idea is simple, but I have to think through it better.
2. D2. Inversion Graph Coloring
  
  DP with optimization.
3. E. Yet Another MEX Problem
  
  Maybe MEX with two pointers?
4. D. A Cruel Segment's Thesis
  
  Looks greedy.
5. 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.
Div 3
1. G. Cry Me a River
  
  Graph problem, don't remember the details.
Div 4
1. F. Gravity Falls
  
  I barely read it, not sure were I found it either, but looks pretty easy.

Gym from simulations or contests that I did

ICPC Brazil first phase
1. 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.
1. L. Last Guess
  
  I think I can solve it with flow.
USP Try-outs
1. B. Tuk-Tuk Express
  
  I have NO clue why my code keeps getting WA, awful implementation problem.
2. J. Apep, the Lord of Chaos
  
  I don't remember what the problem was about, I just know that I tried it before.