https://leettube.dev 2026-10-04T23:34:55.000Z weekly 1 https://leettube.dev/watch/two-sum Two Sum (LeetCode 1) https://leettube.dev/posters/two-sum.jpg Find the two numbers that add up to the target. Walk once, and for each number look up the partner you need in a map of what you've seen. https://leettube.dev/api/video/two-sum.mp4 64 2026-10-04T23:30:20.000Z 2026-10-04T23:30:20.000Z monthly 0.8 https://leettube.dev/watch/best-time-to-buy-stock Best Time to Buy and Sell Stock (LeetCode 121) https://leettube.dev/posters/best-time-to-buy-stock.jpg Buy one day, sell on a later day, for the biggest profit. Walk the prices once, remembering the cheapest day so far. https://leettube.dev/api/video/claude_videos_leetcode_best-time-to-buy-stock.mp4 92 2026-10-04T23:13:21.000Z 2026-10-04T23:13:21.000Z monthly 0.8 https://leettube.dev/watch/valid-parentheses Valid Parentheses (LeetCode 20) https://leettube.dev/posters/valid-parentheses.jpg Check that every bracket is closed by the right type, in the right order. Push each opener, and match each closer against the top of the stack. https://leettube.dev/api/video/claude_videos_leetcode_valid-parentheses.mp4 96 2026-10-04T22:17:51.000Z 2026-10-04T22:17:51.000Z monthly 0.8 https://leettube.dev/watch/binary-search Binary Search (LeetCode 704) https://leettube.dev/posters/binary-search.jpg Find a target in a sorted list. Check the middle and throw away the half that can't hold it, so each step halves the search. https://leettube.dev/api/video/claude_videos_leetcode_binary-search.mp4 99 2026-10-04T22:17:50.000Z 2026-10-04T22:17:50.000Z monthly 0.8 https://leettube.dev/watch/linked-list-cycle Linked List Cycle (LeetCode 141) https://leettube.dev/posters/linked-list-cycle.jpg Does the list loop back on itself? Send a tortoise and a hare down it: if there's a cycle, the faster runner must catch the slower one. https://leettube.dev/api/video/claude_videos_leetcode_linked-list-cycle.mp4 85 2026-10-04T22:57:00.000Z 2026-10-04T22:57:00.000Z monthly 0.8 https://leettube.dev/watch/merge-intervals Merge Intervals (LeetCode 56) https://leettube.dev/posters/merge-intervals.jpg Merge every overlapping interval. Sort by start, then either extend the last merged interval or start a new one. https://leettube.dev/api/video/claude_videos_leetcode_merge-intervals.mp4 99 2026-10-04T22:17:51.000Z 2026-10-04T22:17:51.000Z monthly 0.8 https://leettube.dev/watch/top-k-frequent Top K Frequent (LeetCode 347) https://leettube.dev/posters/top-k-frequent.jpg Find the k values that appear most often. Tally them in a map, then keep a k-spot leaderboard in a min-heap instead of sorting everything. https://leettube.dev/api/video/claude_videos_leetcode_top-k-frequent.mp4 92 2026-10-04T22:57:01.000Z 2026-10-04T22:57:01.000Z monthly 0.8 https://leettube.dev/watch/longest-substring Longest Substring (LeetCode 3) https://leettube.dev/posters/longest-substring.jpg Find the longest run of characters with no repeats. Slide a window along the string, and when a letter repeats, jump the left edge past its last copy. https://leettube.dev/api/video/longest-substring.mp4 95 2026-10-04T23:34:55.000Z 2026-10-04T23:34:55.000Z monthly 0.8 https://leettube.dev/watch/subarray-sum-equals-k Subarray Sum Equals K (LeetCode 560) https://leettube.dev/posters/subarray-sum-equals-k.jpg Count the stretches of numbers that add up to k, negatives included. Keep a running total and a tally of totals seen, and look up the one that's k behind. https://leettube.dev/api/video/subarray-sum-equals-k.mp4 95 2026-10-04T23:34:55.000Z 2026-10-04T23:34:55.000Z monthly 0.8 https://leettube.dev/watch/trapping-rain-water Trapping Rain Water (LeetCode 42) https://leettube.dev/posters/trapping-rain-water.jpg How much rain pools between the bars? Walk in from both ends, always moving the side with the lower wall, whose water is already decided. https://leettube.dev/api/video/claude_videos_leetcode_trapping-rain-water.mp4 95 2026-10-04T22:57:02.000Z 2026-10-04T22:57:02.000Z monthly 0.8 https://leettube.dev/watch/largest-rectangle Largest Rectangle in Histogram (LeetCode 84) https://leettube.dev/posters/largest-rectangle.jpg The biggest rectangle under a histogram. Keep a stack of rising bars, and when a shorter bar arrives, pop and measure each taller one. https://leettube.dev/api/video/claude_videos_leetcode_largest-rectangle.mp4 95 2026-10-04T23:13:26.000Z 2026-10-04T23:13:26.000Z monthly 0.8 https://leettube.dev/watch/invert-binary-tree Invert Binary Tree (LeetCode 226) https://leettube.dev/posters/invert-binary-tree.jpg Mirror a binary tree. Swap a node's two children, then do the same to each child, all the way down. https://leettube.dev/api/video/claude_videos_leetcode_invert-binary-tree.mp4 88 2026-10-04T22:57:01.000Z 2026-10-04T22:57:01.000Z monthly 0.8 https://leettube.dev/watch/implement-trie Implement Trie (LeetCode 208) https://leettube.dev/posters/implement-trie.jpg Insert words, search them and check prefixes. A tree of letters lets words that share a prefix share a path. https://leettube.dev/api/video/claude_videos_leetcode_implement-trie.mp4 93 2026-10-04T23:13:23.000Z 2026-10-04T23:13:23.000Z monthly 0.8 https://leettube.dev/watch/subsets Subsets (LeetCode 78) https://leettube.dev/posters/subsets.jpg List every subset of a set of distinct numbers, empty one included. For each number, branch on taking it or leaving it. https://leettube.dev/api/video/claude_videos_leetcode_subsets.mp4 97 2026-10-04T22:17:49.000Z 2026-10-04T22:17:49.000Z monthly 0.8 https://leettube.dev/watch/house-robber House Robber (LeetCode 198) https://leettube.dev/posters/house-robber.jpg Rob the most cash from a row of houses without hitting two neighbours. Carry the best haul so far, one house at a time. https://leettube.dev/api/video/claude_videos_leetcode_house-robber.mp4 85 2026-10-04T22:17:49.000Z 2026-10-04T22:17:49.000Z monthly 0.8 https://leettube.dev/watch/coin-change Coin Change (LeetCode 322) https://leettube.dev/posters/coin-change.jpg The fewest coins that add up to an amount. Greedy fails, so build up from zero, reusing the best answer for each smaller amount. https://leettube.dev/api/video/claude_videos_leetcode_coin-change.mp4 97 2026-10-04T23:13:24.000Z 2026-10-04T23:13:24.000Z monthly 0.8 https://leettube.dev/watch/edit-distance Edit Distance (LeetCode 72) https://leettube.dev/posters/edit-distance.jpg The fewest inserts, deletes and replaces to turn one word into another. Fill a table where each cell takes the cheapest of three neighbours. https://leettube.dev/api/video/claude_videos_leetcode_edit-distance.mp4 98 2026-10-04T22:57:02.000Z 2026-10-04T22:57:02.000Z monthly 0.8 https://leettube.dev/watch/number-of-islands Number of Islands (LeetCode 200) https://leettube.dev/posters/number-of-islands.jpg Count the islands in a grid of land and water. Scan for land, and sink each island you find so it's only counted once. https://leettube.dev/api/video/claude_videos_leetcode_number-of-islands.mp4 99 2026-10-04T22:17:50.000Z 2026-10-04T22:17:50.000Z monthly 0.8 https://leettube.dev/watch/course-schedule Course Schedule (LeetCode 207) https://leettube.dev/posters/course-schedule.jpg Decide whether you can finish every course given its prerequisites. Take courses with no locks left, and see if every course gets taken. https://leettube.dev/api/video/claude_videos_leetcode_course-schedule.mp4 104 2026-10-04T22:17:52.000Z 2026-10-04T22:17:52.000Z monthly 0.8 https://leettube.dev/watch/network-delay-time Network Delay Time (LeetCode 743) https://leettube.dev/posters/network-delay-time.jpg How long until a signal reaches every tower? Dijkstra's algorithm settles the earliest arrival first, using a min-heap. https://leettube.dev/api/video/claude_videos_leetcode_network-delay-time.mp4 96 2026-10-04T22:57:02.000Z 2026-10-04T22:57:02.000Z monthly 0.8 https://leettube.dev/watch/lru-cache LRU Cache (LeetCode 146) https://leettube.dev/posters/lru-cache.jpg A fixed-size cache with constant-time get and put that evicts the least recently used key. A hash map finds the node, and a linked list keeps the order. https://leettube.dev/api/video/claude_videos_leetcode_lru-cache.mp4 94 2026-10-04T23:13:22.000Z 2026-10-04T23:13:22.000Z monthly 0.8