Divide Intervals Into Minimum Number of Groups | Simple Intuition | Leetcode 2406 | codestorywithMIK

This is the 115th Video of our Playlist "Array 1D/2D : Popular Interview Problems" by codestorywithMIK

In this video we will try to solve a good Array Interval based Problem : Divide Intervals Into Minimum Number of Groups | Simple Intuition | Dry Run | Leetcode 2406 | codestorywithMIK

I will explain the intuition so easily that you will never forget and start seeing this as cakewalk EASYYY.
We will do live coding after explanation and see if we are able to pass all the test cases.
Also, please note that my Github solution link below contains both C++ as well as JAVA code.

Problem Name : Divide Intervals Into Minimum Number of Groups | Simple Intuition | Dry Run | Leetcode 2406 | codestorywithMIK
Company Tags : will update

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Summary :
Sort the intervals: First, the intervals are sorted based on their start times, ensuring that the intervals are processed in the correct order.

Use a Min-Heap (Priority Queue): A min-heap (priority_queue) is used to track the end times of ongoing groups. The heap helps manage overlapping intervals efficiently.

Process intervals: For each interval:

If the current interval's start time is greater than the smallest end time in the heap (i.e., the earliest ending group), the group can be reused. Therefore, we pop the top of the heap.
Push the current interval’s end time into the heap to represent a new or reused group.
Result: The size of the heap at the end represents the minimum number of groups required, as each group corresponds to an active interval at some point.

Time and Space Complexity:

Time Complexity: O(n log n) due to sorting the intervals and heap operations for each interval.
Space Complexity: O(n) for storing end times in the heap.

✨ Timelines✨
00:00 - Introduction

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[ArnabBhadra]

Before solving yesterday's solution
I have seen your max meeting ||| solution (hard) leetcode
And solved yesterday's and today's problem by own.
And this proof that you didn't just solve the qs you cleared the concept
And each question took hardly 10 to 15 mins to solve
And I bet this kind of problem I will easily solve in future till my death .

[akkisujit]

aapka ye daily solution bahut help krt ahai sath me jb aap batate ho ki koi bhi approach kyo laga rahe hai tb aur acah lgta and ache se samajh me aata hai
mata rani aapko aur aapki family ko hamesa khush rakhke taki aap jhum logo ko aise hi quality content provide krte rahe
JAI MATA DI🙏🙏🙏

[aizadiqbal]

Line Sweep Algorithm

yes please make video on this....

[dipalisharma]

Hope ki apki family relative ki surgery ache hui ho and unki recovery fast ho and Allah talla unhe bhut sari blessing and ek lmbi aur healthy and happy life de🎉❤

[taqi]

want "Line Sweep Algorithms" video

[aripact]

Solved this question myself after yesterdays POTD!!! you really clear concepts.❤❤❤.. never ever stop making videos... :>>

[wqffeqf]

pls upload video of line sweep algorithm

[horrorvirus]

Thanks for your daily solutions and videos I had watched your videos around all topics of DSA from array string to graph DP your explanation(story approach) is the best,
I successfully cracked the Oracle internship!

[aws_handles]

Thank you for the motivation MIK.
Jitna thanks bolu kam hai aapko ❤

[Booksmadesimple]

Hello Mik, thank you for explaining intuition so deeply like how you come up with sol and how you thought of the particular data structue, unlike other youtubers that directly jump on sol and data structure used. You first discuss brute force then further optimize it till it become optimal sol.
At first when i saw today's potd, for first 30 seconds i had no idea.but slowly after reading ques and example testcases i slowly start to build sol.at first i thought of using a variable for every grp's max time.then i thought of heap and then i came up with vector storing every grp end time with index representing grp no and a variable to keep track of grp no. and traversing that vector every time .i knew it might give tle but i was happy that i came up to a sol with my own without any help (i didn't even checked ques topic to avoid any kind of hint). and to my surprise it passed 34/35 testcase and last one giving tle.i am so happy and i know that by practice and consistency i can do it.
thank you so much mik for being such a great teacher, you make things so easy.
here's my sol..if anyone can improve it please let me know.i'll be glad to upskill myself.
class Solution {
public:
int intervals) {
int n = intervals.size();
int group = 1;
sort(intervals.begin(), intervals.end());
vector<int>grpmaxi(n+1, 0);
for(int i = 0;i < n;i++){
int arrival = intervals[i][0];
int depart = intervals[i][1];
bool check = false;
for(int j = 1;j <= group;j++){
if(arrival > grpmaxi[j]){
check = true;
grpmaxi[j] = depart;
break;
}
}
if(check == false){
group++;
grpmaxi[group] = depart;
}
else continue;
}
return group;
}
};

[sidhantmalik]

Bhaiya plz teach oops in java and dbms if u complete dbms i will be totally confident for placement currently jn 3rd year luv u bhaiya

[yereneager]

You explain so beautifully bhaiya, Intution se approach tk sb best.

[monikathakur]

Thankyou so much for the solution you are a great teacher ever.. before seeing your video i was able to do only brute-force but the way as you teach literally amazing..

[s_EditZ]

i was not able to solve yesterday's problem even with brute force
but today i solved the problem with brute force as well as optimal .
thank you so much for clearing the concept in detail .
Just because of yesterday's lecture i solved todays problem by my own.

[vivekprakash]

Hi mik bhai, today you mentions the comment in the solution of steps like step 1, step 2 this i want to put in later videos, because it helps alot, already your solution are helping without this, but this time it helps more than earlier. Also i want to thank you, aap padhate aur samjhate bhut hi jabardast ho.
🙏🙏

[Coder_Buzz]

Thank u for the Motivation bhaiya🫶🙇‍♂️

[chic_koo]

Amazing explanation, thanks a lot bhaiya
please teach the concept of Line Sweep Algorithm also

[Addy-kf]

I want to thank you sir for always being my mentor during my journey. Due to your support I was able to get placed in Principal Global Services. I will always be grateful to you. Thank you once again sir ! Using the fake id since I cannot disclose my identity.

[tharunkumar]

Please explain with Line sweep algo also.. Thanks in advance!!

[keshavgarg]

Sir you said you will be uploading stack approach of POTD of the day before yesterday. Please do