Count all Valid Pickup and Delivery Options - Leetcode 1359 - Python

[@coldsky_]

Really good solution! Definitely want to see a discrete math course :D

[@akhilchauhan9417]

Yes for Discreet Maths. Especially struggle with recurrence relation.

[@VidyaBhandary]

Yes would definitely appreciate a discrete math playlist. Your teaching style is simply awesome 💯

[@LOVE-kf9xi]

It is a must , I'd love to see the discrete math playlist!

[@light_70]

That intuition when you cancel out the possibility of invalid arrangement(divide by 2) was great.

[@becomingbesthackerprogramm4644]

Please get a maths course , it's a must

[@pushpamudalkar6756]

Really good explanation! You made the hardest problem seem like a piece of cake

[@shreyaspathak1267]

I'd love to see the discrete math videos

[@СергейШиман-ь5с]

Thanks for the explanation. I was struggling with this daily problem and your video was really helpful.

[@becomingbesthackerprogramm4644]

Really need it , I suffer sm with maths problem 🤧

[@amen652]

A discrete math refresh course would def be nice!

[@aadil4236]

Yes, defenetly want Discrete Math course!!

[@CS_n00b]

non trivial combinatorics problems playlist would be very useful

[@menasafwat7897]

you are genius man , continue you are the best 😎😎

[@patelmanan96]

Yes, please make the discrete math video

[@omkarjadhav6183]

Would love playlist on descrete maths

[@StellasAdi18]

That was amazing solution. Thanks for the intuition.

[@palashsharma26]

Yes please video on discrete math

[@Platcode797]

Please make discrete maths series, Thanks for the solution

[@ChadBryant_G3]

Yes to discrete math course!

[@AdityaGarud-sm7lw]

yes we want discrete math crash course

[@MP-ny3ep]

Great explanation as always!! Thank you!

[@arunvijay2279]

please do separate series for discrete mathematics

[@FullMetalAlgorithmist]

Woah!!!! Amazing explaination.

[@young7529]

definitely want to see the discrete math course

[@kshitijgarg2609]

solid explanation

[@IK-xk7ex]

I got this problem in my today's Days Challenge

[@GuruPrasadShukla]

nice explaination bro support from india

[@jamesabasifreke]

Discrete math please thanks!

[@TheMadTech]

much needed discrete mathematics

[@AdiPrimandaGinting]

What is the intuition to reduce slots by 2 at the last line of the while loop. Is it because in each loop we already calculate the pickup and the other delivery is invalid because it can not precede its pickup?

[@uptwist2260]

Thanks for the daily

[@abhis1560]

Please do make maths necessary for algorithms videos please. Not just discrete mathematics

[@ruibinzhang]

The solution is so easy to understand, but it is difficult for to to solve using Java as I don't know when to do modulo operations.

[@vijayj1997]

Need discrete math course

[@krateskim4169]

Awesome

[@bigboyshassen59]

whats up future doordashers

[@devkumar9889]

It was simple 10th grade mathematics

[@SANDEEPKUMAR-in6li]

Can you please provide the code in JAVA

[@dilipsinghdangwal7035]

class Solution { long mod = 1000000007; public int countOrders(int n) { int slots = 2*n; long ans=1; while(slots > 0){ long ops = (slots*(slots-1))/2; ops %= mod; ans = ans * ops; slots = slots-2; ans%=mod; } return (int)ans; } }

[@SANDEEPKUMAR-in6li]

@@dilipsinghdangwal7035 Thank You

[@jasonahn8658]

FIRST