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List of unsolved problems that I should try again later. Putting everything here to clean List of unsolved problems that I should try again later. Putting everything here to clean
my tabs my tabs
*Contents*
* [Codeforces](#TODO list#Codeforces)
* [Divs](#TODO list#Codeforces#Divs)
* [Educational](#TODO list#Codeforces#Divs#Educational)
* [Div 1/2](#TODO list#Codeforces#Divs#Div 1/2)
* [Div 4](#TODO list#Codeforces#Divs#Div 4)
* [GYM](#TODO list#Codeforces#GYM)
* [ICPC Brazil first phase](#TODO list#Codeforces#GYM#ICPC Brazil first phase)
* [Atcoder](#TODO list#Atcoder)
## Codeforces ## Codeforces
Problem from codeforces. Problem from codeforces.
@ -21,91 +11,91 @@ Problem from codeforces.
Official divs from codeforces Official divs from codeforces
#### Educational - Educational
1. [F. Frogs and Mosquitoes](https://codeforces.com/contest/609/problem/F) 1. [F. Frogs and Mosquitoes](https://codeforces.com/contest/609/problem/F)
I have no clue where to even start. I have no clue where to even start.
2. [E. Water Taps](https://codeforces.com/contest/954/problem/E) 2. [E. Water Taps](https://codeforces.com/contest/954/problem/E)
I have an idea, but it's really annoying to solve it. I have an idea, but it's really annoying to solve it.
3. [F. Fibonacci String Subsequences](https://codeforces.com/contest/946/problem/F) 3. [F. Fibonacci String Subsequences](https://codeforces.com/contest/946/problem/F)
Obviously DP, but not sure how to do it... Obviously DP, but not sure how to do it...
4. [F. Imbalance Value of Tree](https://codeforces.com/contest/915/problem/F) 4. [F. Imbalance Value of Tree](https://codeforces.com/contest/915/problem/F)
Tree problem, looks interesting. Tree problem, looks interesting.
5. [F. Clear The Matrix](https://codeforces.com/contest/903/problem/F) 5. [F. Clear The Matrix](https://codeforces.com/contest/903/problem/F)
DP with optimization? DP with optimization?
#### Div 1/2 - Div 1/2
1. [D. Division Versus Addition](https://codeforces.com/contest/2152/problem/D) 1. [D. Division Versus Addition](https://codeforces.com/contest/2152/problem/D)
The idea is simple, but I have to think through it better. The idea is simple, but I have to think through it better.
2. [D2. Inversion Graph Coloring](https://codeforces.com/contest/2143/problem/D2) 2. [D2. Inversion Graph Coloring](https://codeforces.com/contest/2143/problem/D2)
DP with optimization. DP with optimization.
3. [E. Yet Another MEX Problem](https://codeforces.com/contest/2146/problem/E) 3. [E. Yet Another MEX Problem](https://codeforces.com/contest/2146/problem/E)
Maybe MEX with two pointers? Maybe MEX with two pointers?
4. [D. A Cruel Segment's Thesis](https://codeforces.com/contest/2140/problem/D) 4. [D. A Cruel Segment's Thesis](https://codeforces.com/contest/2140/problem/D)
Looks greedy. Looks greedy.
5. [F. Flint and Steel](https://codeforces.com/contest/2133/problem/F) 5. [F. Flint and Steel](https://codeforces.com/contest/2133/problem/F)
I tried this a long time ago, don't remember what it's about, just remembered 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. that I tried a greedy solution and it didn't work.
#### Div 3 - Div 3
1. [G. Cry Me a River](https://codeforces.com/contest/2137/problem/G) 1. [G. Cry Me a River](https://codeforces.com/contest/2137/problem/G)
Graph problem, don't remember the details. Graph problem, don't remember the details.
#### Div 4 - Div 4
1. [F. Gravity Falls](https://codeforces.com/contest/2148/problem/F) 1. [F. Gravity Falls](https://codeforces.com/contest/2148/problem/F)
I barely read it, not sure were I found it either, but looks pretty easy. I barely read it, not sure were I found it either, but looks pretty easy.
### GYM ### GYM
Gym from simulations or contests that I did Gym from simulations or contests that I did
#### ICPC Brazil first phase - ICPC Brazil first phase
1. [D. Dominoes](https://codeforces.com/gym/106073/problem/D) 1. [D. Dominoes](https://codeforces.com/gym/106073/problem/D)
If I did this one, I would have passed into second phase, must try to solve it If I did this one, I would have passed into second phase, must try to solve it
ASAP. ASAP.
#### ICPC Northwestern European Regional - ICPC Northwestern European Regional
[Link](https://codeforces.com/gym/104875) because it has no problem page in gym. [Link](https://codeforces.com/gym/104875) because it has no problem page in gym.
1. L. Last Guess 1. L. Last Guess
I think I can solve it with flow. I think I can solve it with flow.
#### USP Try-outs - USP Try-outs
1. [B. Tuk-Tuk Express](https://codeforces.com/gym/103934/problem/B) 1. [B. Tuk-Tuk Express](https://codeforces.com/gym/103934/problem/B)
I have NO clue why my code keeps getting WA, awful implementation problem. I have NO clue why my code keeps getting WA, awful implementation problem.
2. [J. Apep, the Lord of Chaos](https://codeforces.com/gym/103934/problem/J) 2. [J. Apep, the Lord of Chaos](https://codeforces.com/gym/103934/problem/J)
I don't remember what the problem was about, I just know that I tried it before. I don't remember what the problem was about, I just know that I tried it before.
## Atcoder ## Atcoder