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

Solving leetcode 1359 - count all valid pickup and delivery options, today's daily leetcode problem on september 9th.
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Problem Link: leetcode.com/problems/count-a...
0:00 - Read the problem
0:30 - Drawing Explanation
6:58 - Coding Explanation
leetcode 1359
#neetcode #leetcode #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!

[@pushpamudalkar6756]

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

[@light_70]

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

[@user-yj2ju9up8o]

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

[@MP-ny3ep]

Great explanation as always!! Thank you!

[@becomingbesthackerprogramm4644]

Please get a maths course , it's a must

[@StellasAdi18]

That was amazing solution. Thanks for the intuition.

[@shreyaspathak1267]

I'd love to see the discrete math videos

[@FullMetalAlgorithmist]

Woah!!!! Amazing explaination.

[@becomingbesthackerprogramm4644]

Really need it , I suffer sm with maths problem 🤧

[@menasafwat7897]

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

[@aadil4236]

Yes, defenetly want Discrete Math course!!

[@amen652]

A discrete math refresh course would def be nice!

[@patelmanan96]

Yes, please make the discrete math video

[@uptwist2260]

Thanks for the daily

[@kshitijgarg2609]

solid explanation

[@palashsharma26]

Yes please video on discrete math

[@omkarjadhav6183]

Would love playlist on descrete maths

[@Platcode797]

Please make discrete maths series, Thanks for the solution

[@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?

[@ChadBryant_G3]

Yes to discrete math course!

[@CS_n00b]

non trivial combinatorics problems playlist would be very useful

[@GuruPrasadShukla]

nice explaination bro support from india

[@arunvijay2279]

please do separate series for discrete mathematics

[@krateskim4169]

Awesome

[@young7529]

definitely want to see the discrete math course

[@AdityaGarud-sm7lw]

yes we want discrete math crash course

[@IK-xk7ex]

I got this problem in my today's Days Challenge

[@jamesabasifreke]

Discrete math please thanks!

[@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.

[@TheMadTech]

much needed discrete mathematics

[@abhis1560]

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

[@vijayj1997]

Need discrete math course

[@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