Just coding and existing...
Joined August 2025
- Tweets 79
- Following 36
- Followers 27
- Likes 111
17 Photos and videos
Day-14
#SDESheetChallenge
Linked List & Arrays Done
✅Trapping Rainwater: two pointers with max boundaries O(n)
✅Remove Duplicates from sorted array: two pointers O(n)
✅Maximum Consecutive Ones: count and reset if visit 0 O(n)
@striver_79 @takeUforward_
#45DaysOfCode #DSA
11
Jun 13
Day-13
#SDESheetChallenge
Linked List & Arrays
✅Rotate a LL: length connect break O(n)
✅Clone a LL with random and next pointer: insert new nodes in b/w og nodes, later separate the lists O(n)
✅3 Sum: sort two pointers O(n²)
@striver_79 @takeUforward_
#45DaysOfCode #DSA
2
38
Jun 12
Day-12
#SDESheetChallenge
Linked List II Done
✅Check if LL is palind. or not: middle reverse compare O(n)
✅Find the starting pt. in LL: Floyd's cycle with reset pointer O(n)
✅Flattening of LL: merge sorted lists recursively O(n*m)
@striver_79 @takeUforward_
#45DaysOfCode #DSA
2
23
Jun 11
Day-11
#SDESheetChallenge
Linked List II
✅Find the intersection of Y LL: pointers switching O(n m)
✅Detect a loop in LL: Floyd's cycle(slow n fast) O(n)
✅Reverse LL in group of K: k-wise reversal with pointers adjustment O(2n)
@striver_79 @takeUforward_
#45DaysOfCode #DSA
2
6
Jun 10
Day-10
#SDESheetChallenge
Lined List I Done
✅Remove Nth node from the back of the LL: fast n slow two pointers O(n)
✅Add two numbers as LL: digit-wise carry while traversing O(max(m, n))
✅Delete Node in a LL O(1): copy next node
@striver_79 @takeUforward_
#45DaysOfCode #DSA
1
14
Jun 9
Day-9
#SDESheetChallenge
Linked List Problems
✅Reverse a LL: maintaining prev, curr, next node pointers O(n)
✅Find Middle of LL: slow n fast pointer O(n/2)
✅Merge two Sorted Lists: visiting each node of both lists once O(n m)
@striver_79 @takeUforward_
#45DaysOfCode #DSA
2
35
Jun 8
Day-8
#SDESheetChallenge
ArrayIV Done
✅Largest Subarray with K sum: prefix sum hashing O(n)
✅Count subarrays with given xor K: prefix xor hashing O(n)
✅Longest Substr Without Repeating Char.: sliding window hashing O(n)
@striver_79 @takeUforward_
#45DaysOfCode #DSA
1
1
9
Jun 8
The above problems helped me understand hashing and its different use cases along with concepts like sliding window, prefix sum/xor.
4
Jun 7
Day-7
#SDESheetChallenge
Array IV Problems
✅Two Sum: hashmap lookup complement search O(n)
✅4 Sum: sort two pointers O(n^3)
✅Longest Consecutive Sequence in an Array: hashset lookup for seq. start O(n)
@striver_79 @takeUforward_
#45DaysOfCoding #DSA #SDESheetChallenge
1
1
10
Jun 7
These problems helped understanding the use of extra space(for reducing the time for lookup using map and set) and approach like two pointer for better time complexities.
4
Jun 6
Day-6
#SDESheetChallenge
ArrayIII Done
✅Majority Element-II: using Boyer-Moore but with 2 elements O(n)
✅Grid unique paths: recursion(optimize dp) O(m*n)
✅Reverse Pairs: merge sort count pairs O(nlogn)
@striver_79 @takeUforward_
#45DaysOfCode #DSA #SDESheetChallenge
2
15
Jun 5
Day-5
#SDESheetChallenge
ArrayIII Problems
✅Search in a 2D matrix: using binary search O(n logm)
✅Pow(x, n): O(logn)
✅Majority Element-I: using Boyer-Moore Voting algo O(n)
@takeUforward_ @striver_79
#45DaysOfCode #DSA #SDESheetChallenge
1
21
Jun 4
Day-4
#SDESheetChallenge
ArrayII Done
✅Find the duplicate no.: Hare-Tortoise method O(n)
✅Find the repeating and missing no.: Two bucket method O(n)
✅Inversion of array: using merge sort O(nlogn)
@takeUforward_ @striver_79
#45DaysOfCode #DSA #SDESheetChallenge
1
3
60
Jun 4
I was just about to leave this challenge today, but I didn't. I showed up and am happy about it.
Btw these problems were very interesting and intuitive
15
Jun 3
Day 3
#SDESheetChallenge
Done ArrayII Problems
✅Rotate matrix by 90 deg: transpose reverse O(n*n) ✅Merge Overlapping Subintervals: sort merge O(nlogn)
✅Merge 2 sorted arrays w/o extra space: by comparing elements O(n m)
@takeUforward_ @striver_79
#DSA #45DaysOfCode
2
32
Jun 2
Day 2
#SDESheetChallenge Done
Array Problems
✅Kadane's Algo: max subarray sum (-ve, ve ele) O(n)
✅Sort array of 0, 1 & 2: dutch national flag using 3 pointers O(n)
✅Best time to buy & sell stock: track highest price from back O(n)
@takeUforward_ @striver_79
#DSA #45DaysOfCode
1
7
75
Jun 1
Day 1
#SDESheetChallenge Done✔️
Array Problems
✅Set Matrix Zeros: matrix traversal row/col marking O(nm)
✅Pascal's Triangle 1: nCr formulation(dp-previous row addition) O(r)
✅Next Permutation: pivot swap reverse O(n)
@takeUforward_ @striver_79
#DSA #45DaysOfCode #Coding
1
1
7
121
Jun 1
1
125
May 29
Let's go 😁
This is something I am looking for
Will try my best to be more consistent through this challenge
1
55