BTech’28, Learning nd Building Projects
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Life doesn’t ask if you’re ready 🌱
It simply brings change.
And your only choice is this: resist or grow
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Vishal retweeted
You know you chose the right career when all you need is your laptop, your brain & a good coffee on a random day.
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Day 23 of APEX 151
Today’s one: Permutation in String — LC 567
The key was keeping a fixed-size window and comparing character frequencies instead of generating permutations
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Day 22 of APEX 151
Today’s one: Minimum Size Subarray Sum — LC 209
Expand the window until the sum reaches the target, then shrink it from the left to find the smallest valid window
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Learned Agent Orchestration with LangGraph from @surajtwt_
@Hiteshdotcom @ChaiCodeHQ @piyushgarg_dev @yntpdotme @nirudhuuu
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Day 21 of APEX 151
Today’s one: Longest Substring Without Repeating Characters — LC 3
Sliding window + tracking the last index of each character. The key was moving the left pointer directly instead of checking the whole window again
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Day 20 of APEX 151
Today’s one: Trapping Rain Water — LC 42
Two pointers + keeping track of the highest wall on both sides
Time: O(n)
Space: O(1)
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Day 19 of APEX 151
Today’s one: 3Sum — LC 15
This one felt like a proper step up💀
Sorted the array, fixed one number, then used two pointers to find the other two. Also had to handle duplicates carefully so the same triplet doesn't show up twice
19/151
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Day 18 of APEX 151
Today’s one: Valid Palindrome — LC 125
Two pointers, but with a little cleanup along the way
Skipped non-alphanumeric characters, compared everything case-insensitively, and kept moving inward
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Day 17 of APEX 151
Today’s one: Product of Array Except Self — LC 238
Just two passes:
→ Prefix products
→ Suffix products
The trick was realizing the answer can be built while calculating both
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Got my Bharat Builds 2026 badge!
Officially participating in the WeMakeDevs × AWS Bharat Builds Tour.
Now it's time to build something.
#BharatBuilds #AWS #WeMakeDevs #Hackathon
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Day 16 of APEX 151
Today’s one: Subarray Sum Equals K — LC 560
Prefix sums + HashMap
At first, the total - k part felt a little confusing, but once the prefix-sum idea clicked, the solution made a lot more sense
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Day 15 of APEX 151
Today’s one: Longest Consecutive Sequence — LC 128
The interesting part was getting O(n) without sorting the array
Used a HashSet and only started counting when the current number was the start of a sequence
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Day 14 of APEX 151
Today’s one: Two Sum — LC 1
A classic, but this time I focused on the HashMap approach
Instead of checking every possible pair, store what we've already seen and look for the number we need
Simple idea. Big difference.
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