That problem is going to have many submissions right now !!!

Just a humble suggestion Alex7 , i think you should make the video for each problem in two parts : 1. Covering the algo 2. Covering the implementation . This way you can take enough time explaining the entire stuff . It has some advantages, such as :

• Someone can first try to implement the logic themselves first before seeing your implementation.
• You get more time to explain everything without any hurry . Like in this video ,i couldn't understand the part where you talks about taking maxl as constant .
• Each video will be no longer than 10-12 minutes and people can watch both or anyone part of it depending on their weakness-whether they struggle with coming up with the algo or they struggle in implementing their idea .

BTW, great initiative and lots of thanks :D

Very Nice Alex.. But i prefer shorter videos :-)

this is great.. but I will try to solve the problem before watching the video :p

BTW, Nice job with this series.. this is a whole new step in this community and I think many contestants will find it useful. I know cause I couldn't find any good tutorials when I started practicing :(

Great tutorial! Although I would prefer harder problems.