Sandhiya Priya's contributions

Learn to efficiently count pairs with a difference less than k in an array using Java. This optimized solution leverages sorting and the two-pointer technique for O(n log n) time complexity.

Learn an O(n) Java solution for finding the maximum-sum contiguous subarray with length at least K using Kadane's algorithm and a sliding window.

Optimize range increment operations from O(nm) to O(n+m) using a difference array and prefix sum technique for finding the maximum element.

Solve subset product problems with distinct primes using Bitmask DP. Efficiently handles values up to 30 by mapping primes to bits.

Master Maximum Subset XOR in Java! Learn the efficient XOR Basis/Gaussian Elimination approach to solve this problem in O(n) time.

Split an array into minimum subsets of consecutive numbers. Count starting points efficiently using a HashSet for O(n) time complexity.

Construct a full binary tree from preorder and mirror preorder traversals. Learn the unique reconstruction method for full binary trees.

Find the longest consecutive path in a binary tree where child nodes are exactly 1 greater than their parent. Uses DFS.

Learn how to validate if an array represents a BST's preorder traversal using a stack and lower bound logic. Efficient O(n) solution.

Find the minimum deletions to make an array strictly increasing by calculating the Longest Increasing Subsequence (LIS) efficiently.

Find the maximum index difference by jumping between alphabets in a string, starting from 'a'. Optimized O(N) solution.

Discover the shortest unique prefix for every word in an array using a Trie. Efficiently identify distinct word beginnings with this optimized algorithm.

Master the Cut Matrix problem with DP + Binary Search. Learn to slice grids into k valid pieces efficiently, optimizing cuts for speed.

Solve the max absolute difference of two non-overlapping subarrays in O(n) using Kadane's Algorithm and four helper arrays.

This article explains how to solve the Numbers with Given Digit Sum problem using Dynamic Programming (DP). Starting from the brute-force approach, it gradually builds the DP solution with state definition, transition formula, initialization, dry run, Java implementation, and time and space complexity analysis. The explanation is beginner-friendly and suitable for coding interview preparation.

Learn how to solve the Longest Bitonic Subarray problem in Java using an efficient O(n) approach. This tutorial includes the problem statement, algorithm, step-by-step explanation, dry run, Java code, complexity analysis, and interview tips.

Find the smallest non-zero starting value for x to keep it non-negative throughout array processing using a greedy reverse traversal.

Find the minimum operations to restore a permutation array to its original state by analyzing disjoint cycles and their LCM.

Learn how to count representations of a positive integer as a sum of two or more consecutive natural numbers using arithmetic progression and an O(sqrt n) Java algorithm.

Learn how to count array pairs whose sum is divisible by K in Java using remainders and a frequency array in O(n) time.

Optimize tower signal reachability by reversing DFS/BFS from stations. Efficiently find towers connecting to both P and Q.

Find the largest unblocked rectangular area in a grid with blocked rows/columns by identifying max gaps between blocked lines.

Find the maximum sum path in two sorted arrays with distinct integers, allowing switches at common elements.

Efficiently count binary substrings with more 1s than 0s using prefix sums and Fenwick trees in O(N log N) time.