401-500

('$' means the problem is locked on Leetcode, '*' means the problem is related to Database, '#' means the problem is related to Shell.)

#	Title	Solution	Difficulty
500	Keyboard Row	60.20%	Easy
499	The Maze III	32.00%	Hard
498	Diagonal Traverse	46.20%	Medium
497	Random Point in Non-overlapping Rectangles	33.20%	Medium
496	Next Greater Element I	58.80%	Easy
495	Teemo Attacking	51.90%	Medium
494	Target Sum	44.40%	Medium
493	Reverse Pairs	17.10%	Hard
492	Construct the Rectangle	49.70%	Easy
491	Increasing Subsequences	39.30%	Medium
490	The Maze	42.80%	Medium
489	Robot Room Cleaner	57.10%	Hard
488	Zuma Game	38.00%	Hard
487	Max Consecutive Ones II $	42.70%	Medium
486	Predict the Winner	43.60%	Medium
485	Max Consecutive Ones	55.30%	Easy
484	Find Permutation $	50.50%	Medium
483	Smallest Good Base	30.60%	Hard
482	License Key Formatting	41.20%	Medium
481	Magical String	46.20%	Medium
480	Sliding Window Median	31.00%	Hard
479	Largest Palindrome Product	23.90%	Easy
478	Generate Random Point in a Circle	33.80%	Medium
477	Total Hamming Distance	44.10%	Medium
476	Number Complement	61.20%	Easy
475	Heaters	30.20%	Easy
474	Ones and Zeroes	34.90%	Medium
473	Matchsticks to Square	31.80%	Medium
472	Concatenated Words	29.20%	Hard
471	Encode String with Shortest Length $	43.50%	Hard
470	Implement Rand10() Using Rand7()	43.00%	Medium
469	Convex Polygon $	27.20%	Medium
468	Validate IP Address	22.10%	Medium
467	Unique Substrings in Wraparound String	29.90%	Medium
466	Count The Repetitions	24.20%	Hard
465	Optimal Account Balancing $	29.20%	Hard
464	Can I Win	22.20%	Medium
463	Island Perimeter	56.70%	Easy
462	Minimum Moves to Equal Array Elements II	50.90%	Medium
461	Hamming Distance	73.20%	Easy
460	LFU Cache	18.30%	Hard
459	Repeated Substring Pattern	39.70%	Easy
458	Poor Pigs	40.70%	Easy
457	Circular Array Loop	20.60%	Medium
456	132 Pattern	28.00%	Medium
455	Assign Cookies	48.10%	Easy
454	4Sum II	42.80%	Medium
453	Minimum Moves to Equal Array Elements	46.30%	Easy
452	Minimum Number of Arrows to Burst Balloons	42.10%	Medium
451	Sort Characters By Frequency	50.90%	Medium
450	Delete Node in a BST	34.50%	Medium
449	Serialize and Deserialize BST	41.20%	Medium
448	Find All Numbers Disappeared in an Array	58.30%	Easy
447	Number of Boomerangs	42.20%	Easy
446	Arithmetic Slices II - Subsequence	22.30%	Hard
445	Add Two Numbers II	45.40%	Medium
444	Sequence Reconstruction $	20.50%	Medium
443	String Compression	35.80%	Easy
442	Find All Duplicates in an Array	46.40%	Medium
441	Arranging Coins	36.20%	Easy
440	K-th Smallest in Lexicographical Order	21.50%	Hard
439	Ternary Expression Parser $	49.40%	Medium
438	Find All Anagrams in a String	33.50%	Easy
437	Path Sum III	38.60%	Easy
436	Find Right Interval	42.30%	Medium
435	Non-overlapping Intervals	39.80%	Medium
434	Number of Segments in a String	38.40%	Easy
433	Minimum Genetic Mutation	33.50%	Medium
432	All O`one Data Structure	28.30%	Hard
431	Encode N-ary Tree to Binary Tree $	53.70%	Hard
430	Flatten a Multilevel Doubly Linked List	36.20%	Medium
429	N-ary Tree Level Order Traversal	55.80%	Easy
428	Serialize and Deserialize N-ary Tree $	48.10%	Hard
427	Construct Quad Tree	49.20%	Easy
426	Convert Binary Search Tree to Sorted Doubly Linked List	43.30%	Medium
425	Word Squares $	40.10%	Hard
424	Longest Repeating Character Replacement	38.10%	Medium
423	Reconstruct Original Digits from English	40.80%	Medium
422	Valid Word Square $	36.40%	Easy
421	Maximum XOR of Two Numbers in an Array	36.40%	Medium
420	Strong Password Checker	22.10%	Hard
419	Battleships in a Board	59.30%	Medium
418	Sentence Screen Fitting $	25.10%	Medium
417	Pacific Atlantic Water Flow	31.10%	Medium
416	Partition Equal Subset Sum	36.80%	Medium
415	Add Strings	41.50%	Easy
414	Third Maximum Number	26.50%	Easy
413	Arithmetic Slices	53.50%	Medium
412	Fizz Buzz	57.50%	Easy
411	Minimum Unique Word Abbreviation $	25.60%	Hard
410	Split Array Largest Sum	25.00%	Hard
409	Longest Palindrome	44.90%	Easy
408	Valid Word Abbreviation $	26.20%	Easy
407	Trapping Rain Water II	33.10%	Hard
406	Queue Reconstruction by Height	54.10%	Medium
405	Convert a Number to Hexadecimal	41.80%	Easy
404	Sum of Left Leaves	46.20%	Easy
403	Frog Jump	31.70%	Hard
402	Remove K Digits	25.90%	Medium
401	Binary Watch	43.00%	Easy