Sitesh

20 · CSE'28 · Astrophile · Grinding DSA & building things.
Mindset over excuses. 🌌

[Sitesh @Albedo_369]

June recap.
113 → 125 problems. +12.
Finished the Hard array FAQs.
Topics: 3 Sum, 4 Sum, Kadane's, Next Permutation, Majority Element II, Count Inversions, Reverse Pairs, Merge Without Extra Space.
Most productive month yet.
Happy\.
#DSA #TUF #Striver #CodingJourney

[Sitesh @Albedo_369]

Day 33 of DSA grind.
Solved 4 Sum all three ways:
->Brute - Checked every possible quadruplet to find the target sum
-> Better - Reduced unnecessary computations using hashing
-> Optimal - Used sorting and the two-pointer technique

#DSA #TUF #Striver #Day33 #coding

[Sitesh @Albedo_369]

Day 32 of DSA grind.
Solved 3Sum two more ways:
-> Better - hashset to find third element, set to avoid duplicate triplets
-> Optimal - sort + two pointers, skip duplicates in-place

clicked \
#DSA #TUF #Striver #Day32 #coding

[Sitesh @Albedo_369]

Day 31 of DSA grind.
Revised Pascal's Triangle + Rotate Matrix .
Solved two problem more :
-> 2 Sum (brute→better→optimal)
-> 3 Sum (brute)
Back on track \

#DSA #TUF #Striver #Day31 #coding

[Sitesh @Albedo_369]

Solved a Stripe problem today
https://t.co/UQIjDE83we
Scary bitwise equation → simplified to:
A[i] + (A[i] ⊕ A[j]) = K
O(N) solution using HashMap.
Key: learn the identities, not the tricks.
Full breakdown on Medium : https://t.co/RMACSJ3mN3

#DSA #BitManipulation #CPP #Stripe

[Sitesh @Albedo_369]

Day 30 of DSA grind.

Solve-Rotate Matrix by 90 degrees (Optimal).
Intuition: Instead of using an extra matrix, we can rotate the matrix in-place by performing two operations:
Transpose the matrix ->>Reverse each row
Space Complexity - O(1)

#DSA #TUF #Striver #Day30 #coding

[Sitesh @Albedo_369]

May recap.
92 → 113 problems. +21. +5 medium.
Topics: Sorting, Arrays (rotation, search, duplicates), Logic Building (zeros, missing number, union/intersection), Medium FAQs (Majority Element, Spiral Matrix, Pascal's Triangle).
Target June.\
#DSA #TUF #Striver #coding #happy

[Sitesh @Albedo_369]

Day 29 of DSA grind.

Solve-Rotate Matrix by 90 degrees (brute force).
Intuition: first row of original -> last column of new matrix.
Map each element as ans[j][n-1-i] = matrix[i][j].
O(n²) time, O(n²) space.
Solve optimal tomorrow.
Hard day .\
#DSA #TUF #Striver #Day29 #coding

[Sitesh @Albedo_369]

Day 28 of DSA grind.

Solved all 3 Pascal's Triangle problems today.
I — single element: C(r-1, c-1). O(c)
II — nth row: iterative C values. O(n)
III — full triangle: row generator × n. O(n²)
One formula, three problems.
Happy. \
#DSA #TUF #Striver #Day28 #coding #CPP

[Sitesh @Albedo_369]

Day 27 of DSA grind .
Solved 2 problems today
Rearrange Array Elements by Sign
-> Brute: extra array, two passes
-> Optimal: two pointer, single pass
Spiral Matrix
-> Shrinking boundaries
-> No visited array needed
See you tomorrow.\
#DSA #TUF #Striver #Day27 #coding

[Sitesh @Albedo_369]

@almostnaman Bro's grinding so hard that he forgot Twitter exists... or Twitter forgot him. 💀
No tweets for 3 days.

[Sitesh @Albedo_369]

Solved one more Leaders in an Array 2 ways.
Brute Force – nested loops, bool flag to check all right elements.
Optimal – traverse right to left, track max seen so far. O(n).
Key insight: if no element to your right is greater, you're the leader.
#DSA #TUF #Striver #Day26 #coding

[Sitesh @Albedo_369]

Day 26 of DSA grind.

Solved Majority Element 3 ways.
Brute Force - nested loops.
Hash Map - store frequencies, find who crossed n/2.
Boyer-Moore Voting - different elements cancel out. majority survives as it appears more than n/2 times.

#DSA #TUF #Striver #Day26 #coding

[Sitesh @Albedo_369]

A beautiful conjunction of the Moon, Venus and Jupiter in the Gemini constellation.

[Sitesh @Albedo_369]

Day 25 of the DSA grind.

Completed three more problems of arrays( logic building)
-> Find the Missing Number in Sorted Array
Used the natural number sum approach for an optimized solution.

-> Union of Two Sorted Arrays
Learned the power of the two-pointer technique for merging efficiently.

-> Intersection of Two Sorted Arrays
Practiced element matching and traversal logic using two pointers.

Now moving to the FAQs (medium)
#DSAjourney #TUF #Striver #coding #DSA #Day25

[Sitesh @Albedo_369]

@almostnaman 😭katam hie nahi ho rha hai

[Sitesh @Albedo_369]

Day 24 of the DSA grind.

Completed two problem of array (Logic Building)
-> Move Zeroes to end
-> Remove Duplicates from Sorted Array

Key insight -- popping while looping = skipping elements. Never again.

Both problems cracked with the same two-pointer pattern —
One pointer reads. One pointer writes. Condition decides what's worth keeping.

#DSAjourney #TUF #Striver #coding #Day24

[Sitesh @Albedo_369]

Day 23 of the DSA grind.

Completed Array Fundamentals :
→ Second Largest Element
→ Maximum Consecutive Ones
→ Left Rotate Array by One
And the last problem — Left Rotate Array by K Places
Key insight: k % n handles cases when k is larger than the array size.
After that, it’s all about using a temp array + pointer shifting logic.
Now moving towards Logic Building in Arrays
#DSAjourney #TUF #Striver #coding #Day23

[Sitesh @Albedo_369]

@hanifi_karipcin Thanks!

[Sitesh @Albedo_369]

@almostnaman Web3 ke 🙂

[Sitesh @Albedo_369]

Just submitted SolSight to @joincolosseum Frontier Hackathon!
AI-powered Solana wallet analyzer — paste any wallet address, get instant plain-English breakdown of on-chain activity.
Built solo with zero Web3 experience.
Live: https://t.co/aDSky88kYg
#Frontier #Solana #BuildOnSolana