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Fix TODO list

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TODO.md
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@ -3,16 +3,6 @@
List of unsolved problems that I should try again later. Putting everything here to clean
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
Problem from codeforces.
@ -21,60 +11,60 @@ Problem 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.
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.
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...
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.
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?
#### 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.
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.
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?
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.
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
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.
#### 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.
@ -82,28 +72,28 @@ Official divs from codeforces
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
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.
#### 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.
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.