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Longest Palindromic Substring with Transformations

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Maximum Subarray Sum with Constraints

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Update running total

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Count positives and negatives

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Find min and max together

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Swap without temp using arithmetic

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Track best score with index

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Sliding sum of size k

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Balance tracker

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Compute prefix min array

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Variable scope demo (return value)

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Count distinct in range queries (offline)

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Event counter with rollback (savepoint idea)

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Rate limiter counter

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Compute max profit with two transactions

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Reverse an array in-place

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Count even numbers

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Check array sorted (non-decreasing)

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Find maximum element

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Sum of array elements

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Move zeros to end (stable)

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Rotate right by k

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Second largest distinct

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Find missing number 1..n

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Two sum in sorted array

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Count subarrays with sum = k

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Maximum product of any pair

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Merge two sorted arrays into first

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Longest consecutive sequence length

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Range add queries (difference array)

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Build a list from input values

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Remove duplicates but keep order

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Count frequency of numbers

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Use Deque as stack

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Queue simulation

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First unique number in list

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Top K frequent numbers

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Group numbers by remainder

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Sliding window max using deque

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Sort objects by two fields

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LRU cache (basic)

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Detect cycle in directed graph

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Merge intervals

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K-way merge of sorted lists

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Most common within window

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Sum numbers divisible by 3

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Count digits in a number

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Reverse digits

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Check leap year

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Print star pattern count

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FizzBuzz count

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Nth Fibonacci (iterative)

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GCD using Euclid

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Find first prime >= n

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Simulate simple ATM steps

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Minimum steps to reach target (1 or 2)

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Count paths in grid with obstacles

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Validate parentheses string

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Binary search first >= target

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Max subarray sum (Kadane)

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Check if value fits in byte

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Convert char digit to int

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Absolute difference as long

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Check if string is numeric (no sign)

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Parse binary string to int

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Clamp value in range

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Compare doubles with epsilon

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Count set bits in int

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Safe average without overflow

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Detect overflow on add

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Convert seconds to hh:mm:ss parts

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Fast power (pow)

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Encode two ints into one long

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Compute checksum mod 1e9+7

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Split integer into digits array

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Safe divide

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Validate positive input

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Parse int with fallback

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Array access safe read

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Ensure object not null

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Try-with-resources style (concept)

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Custom exception for business rule

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Validate age range

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Convert checked to unchecked

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Multiple validations with one throw

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Transactional-like update with rollback

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Retry operation 3 times

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Validate sorted input or fail fast

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Propagate cause chain

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Fail-safe resource close with primary exception

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Swap two elements

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Copy array manually

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Find first occurrence

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Count occurrences

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Find minimum value

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Reverse a subrange

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Remove element (new length)

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Merge two arrays alternately

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Prefix sum array

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Find majority element (Boyer-Moore)

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Find intersection of two arrays (unique)

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Minimum window size for sum >= target

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Rearrange array by sign (stable)

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Count inversions (merge sort)

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Product of array except self

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Check if number is palindrome

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Count vowels in char array

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Check anagram (letters only)

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Compute factorial

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Check power of two

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Implement lowerBound utility

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String compression (count runs)

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Find first non-repeating char

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Validate IPv4 (basic)

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LRU-like method using LinkedHashMap

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Run-length decode

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Evaluate postfix expression

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KMP prefix table

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Find median of two sorted arrays (merge approach)

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Encapsulation with getter/setter

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Constructor overloading

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Method overriding basics

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Interface usage

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Immutable value object

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Copy constructor and defensive copy

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Comparable implementation

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Factory method pattern

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Composition over inheritance

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Polymorphic billing

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Strategy pattern for sorting key

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Thread-safe counter (synchronized)

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Deep clone object graph (simple)

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Builder pattern (basic)

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Equals/HashCode with inheritance (safe)

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Bitwise AND of two numbers

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Check odd using bit operator

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Swap using XOR

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Set k-th bit

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Clear k-th bit

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Toggle k-th bit

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Extract lowest set bit

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Count bits using Kernighan

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Check if kth bit is set

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Build mask between l..r

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Reverse bits in 32-bit int

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Find single number (others twice)

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Find two single numbers

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Subset check using bitmask

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Compute parity bit

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Swap two variables using temp

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Increment and return

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