peram venkata Brahma Reddy

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 27 of @geeksforgeeks 160
⚡ Merge Without Extra Space
✔️ Use Gap Method (Shell Sort idea) to minimize swaps
⏳ TC: O((N+M) log(N+M)) | 🛑 SC: O(1)
#gfg160 #geekstreak2025 #DSA #merge #arrays #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 26 of @geeksforgeeks 160
⚡ Non-overlapping Intervals
✔️ Greedy approach: sort by end time, count overlapping intervals
⏳ TC: O(N log N) | 🛑 SC: O(1)
#gfg160 #geekstreak2025 #DSA #intervals #greedy #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 25 of @geeksforgeeks 160
⚡ Insert Interval
✔️ Merge overlapping intervals while inserting the new one into the sorted list
⏳ TC: O(N) | 🛑 SC: O(N)
#gfg160 #geekstreak2025 #DSA #intervals #insertinterval #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 24 of @geeksforgeeks 160
⚡ Overlapping Intervals
✔️ Sort intervals by start, merge if current start ≤ previous end
⏳ TC: O(N log N) | 🛑 SC: O(1)
#gfg160 #geekstreak2025 #DSA #intervals #mergeintervals #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 23 of @geeksforgeeks 160
⚡ Count Inversions
✔️ Use modified merge sort to count pairs (i < j) where arr[i] > arr[j]
⏳ TC: O(N log N) | 🛑 SC: O(N)
#gfg160 #geekstreak2025 #DSA #mergeSort #inversionCount #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 22 of @geeksforgeeks 160
⚡ Find H-Index
✔️ Sort citations and find max i such that citations[n - i] >= i
⏳ TC: O(N log N) | 🛑 SC: O(1)
#gfg160 #geekstreak2025 #DSA #HIndex #codingchallenge #researchmetrics

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 21 of @geeksforgeeks 160
⚡ Sort 0s, 1s and 2s
✔️ Use Collections.sort() or Arrays.sort() (if allowed)
⏳ TC: O(N log N) | 🛑 SC: O(1) (in-place sort)
#gfg160 #geekstreak2025 #DSA #sorting #builtinfunction #codingchallenge4o

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 20 of @geeksforgeeks 160
⚡ Strings Rotations of Each Other
✔️ Check if s2 is a substring of s1 + s1
⏳ TC: O(N) | 🛑 SC: O(1)
#gfg160 #geekstreak2025 #DSA #stringrotation #substring #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 19 of @geeksforgeeks 160
⚡ Min Chars to Add for Palindrome
✔️ Use KMP on s + '$' + reverse(s) to find longest palindromic prefix
⏳ TC: O(N) | 🛑 SC: O(N)
#gfg160 #geekstreak2025 #DSA #palindrome #KMP #stringproblem #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 18 of @geeksforgeeks 160
⚡ Search Pattern (KMP Algorithm)
✔️ Preprocess pattern to build LPS array, skip unnecessary comparisons
⏳ TC: O(N + M) | 🛑 SC: O(M)
#gfg160 #geekstreak2025 #DSA #kmp #stringmatching #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 17 of @geeksforgeeks 160
⚡ Non Repeating Character
✔️ Use HashMap to count frequencies, then find first char with count 1
⏳ TC: O(N) | 🛑 SC: O(1)
#gfg160 #geekstreak2025 #DSA #nonrepeating #hashmap #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

📅 Day 16 of @geeksforgeeks 160
⚡ Anagram Check using HashMap
✔️ Compare character frequencies of both strings
⏳ TC: O(N) | 🛑 SC: O(N)
#gfg160 #geekstreak2025 #DSA #anagram #hashmap #codingchallenge

[peram venkata Brahma Reddy @PeramBrahma13]

Day 15 of @geeksforgeeks 160
⚡ Add Binary Strings
⏳ TC: O(N) | 🛑 SC: O(1)
#gfg160 #DSA #geekstreak2025 #binaryaddition #bitmagic

[peram venkata Brahma Reddy @PeramBrahma13]

Day 14 of @geeksforgeeks 160
⚡ Implement Atoi
✔️ Skip spaces, handle sign, read digits
✔️ Clamp to 32-bit int range
⏳ TC: O(N) | 🛑 SC: O(1)
#gfg160 #DSA #geekstreak2025 #atoi

[peram venkata Brahma Reddy @PeramBrahma13]

Day 13 of @geeksforgeeks 160
⚡ Smallest Positive Missing Number
✔️ Place positives in correct index (index = value - 1)
✔️ Ignore negatives & out-of-bound values
⏳ TC: O(N), 🛑 SC: O(1)
#gfg160 #geeksforgeeks #geekstreak2025

[peram venkata Brahma Reddy @PeramBrahma13]

Day 12 of @geeksforgeeks 160
🔁 Max Circular Subarray Sum (Kadane's)
✔️ Max normal subarray sum using Kadane’s
✔️ Min subarray sum using modified Kadane’s
📈 Max circular = max(normal, totalSum - minSubarray)
⏳ TC: O(N), 🛑 SC: O(1)
#gfg160 #geeksforgeeks #geekstreak2025

[peram venkata Brahma Reddy @PeramBrahma13]

Day 11 of @geeksforgeeks 160
⚡ Maximum Product Subarray
✔️ Track both max & min product at every step (handles negatives)
✔️ Reset on encountering 0
🧠 Edge case: negatives can flip max/min
⏳ TC: O(N), 🛑 SC: O(1)
#gfg160 #geeksforgeeks #DSA #maxproduct #geekstreak2025

[peram venkata Brahma Reddy @PeramBrahma13]

Day 10 of @geeksforgeeks 160
💥 Kadane’s Algorithm – Max Subarray Sum
✔️ Keep track of current & global max sum
✔️ If current sum drops below 0, restart from next element
⏳ TC: O(N), 🛑 SC: O(1)
#Kadane #gfg160 #geeksforgeeks #dsa #codingdaily #geekstreak2025

[peram venkata Brahma Reddy @PeramBrahma13]

Day 9 of @geeksforgeeks 160
🏙️ Minimize the Heights II (Greedy + Sorting)
✔ Sort the array
✔ Minimize difference by adjusting extremes (±K)
✔ Ensure no tower becomes negative
⏳ TC: O(N log N), 🛑 SC: O(1)
#gfg160 #geeksforgeeks #geekstreak2025

[peram venkata Brahma Reddy @PeramBrahma13]

Day 8 of @geeksforgeeks 160
💹 Stock Buy & Sell – Max One Transaction Allowed (One Pass)
✔ Track minimum price so far
✔ Update max profit at each step
⏳ TC: O(N), 🛑 SC: O(1)
#gfg160 #geeksforgeeks #geekstreak2025