- 1871. Jump Game VII POTD · · 4 min read Leetcode / POTD How a running prefix-sum difference array tracks reachable positions across jump ranges in a single linear pass.
- 1674. Minimum Moves to Make Array Complementary POTD · · 3 min read Leetcode / POTD Brute force over all target sums is O(n²) — learn how a difference array over pair ranges collapses it to O(n log n).
- 1665. Minimum Initial Energy to Finish Tasks POTD · · 2 min read Leetcode / POTD Learn how a greedy sorting strategy based on task 'buffer' minimizes the initial energy needed to complete all tasks in any order.
- 788. Rotated Digits POTD · · 3 min read Leetcode / POTD Discover how to count good integers up to n using a simple bruteforce method, and learn an optimal Digit DP approach to scale up to massive numbers.
- 396. Rotate Function POTD · · 3 min read Leetcode / POTD Compute F(0) from scratch, then derive every subsequent rotation value in O(1) using the total array sum.
- 2833. Furthest Point From Origin POTD · · 2 min read Leetcode / POTD Count L and R moves, then replace every wildcard with the more frequent direction to maximize distance from the origin.
- 2615. Sum of Distances POTD · · 3 min read Leetcode / POTD Group equal values, then compute prefix and suffix sums of distances to avoid the O(n²) brute-force approach.
- 2452. Words Within Two Edits of Dictionary POTD · · 2 min read Leetcode / POTD A straightforward brute-force solution works here: compare each query with each dictionary word and keep it if the number of differing positions is at most two.
- 1722. Minimize Hamming Distance After Swap Operations POTD · · 3 min read Leetcode / POTD Group swappable indices into connected components, then compare the values inside each component to count the minimum possible mismatches.