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

[@user-yj2ju9up8o]

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

[@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

[@shreyaspathak1267]

I'd love to see the discrete math videos

[@StellasAdi18]

That was amazing solution. Thanks for the intuition.

[@MP-ny3ep]

Great explanation as always!! Thank you!

[@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!!

[@FullMetalAlgorithmist]

Woah!!!! Amazing explaination.

[@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

[@CS_n00b]

non trivial combinatorics problems playlist would be very useful

[@Platcode797]

Please make discrete maths series, Thanks for the solution

[@palashsharma26]

Yes please video on discrete math

[@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

[@kshitijgarg2609]

solid explanation

[@ChadBryant_G3]

Yes to discrete math course!

[@arunvijay2279]

please do separate series for discrete mathematics

[@young7529]

definitely want to see the discrete math course

[@GuruPrasadShukla]

nice explaination bro
support from india

[@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.

[@IK-xk7ex]

I got this problem in my today's Days Challenge

[@AdityaGarud-sm7lw]

yes we want discrete math crash course

[@jamesabasifreke]

Discrete math please thanks!

[@TheMadTech]

much needed discrete mathematics

[@abhis1560]

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

[@vijayj1997]

Need discrete math course

[@krateskim4169]

Awesome

[@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