问题列表

统计信息

• 总题数: 328
• 已解决: 328
• 解决率: 100.0%
• 简单: 160 (已解决: 160)
• 中等: 156 (已解决: 156)
• 困难: 12 (已解决: 12)

按题号排序

• 0001 two sum (简单) ✅
• 0002 add two numbers (中等) ✅
• 0003 longest substring without repeating characters (中等) ✅
• 0004 median of two sorted arrays (困难) ✅
• 0005 longest palindromic substring (中等) ✅
• 0006 zigzag conversion (中等) ✅
• 0007 reverse integer (中等) ✅
• 0008 string to integer (atoi) (中等) ✅
• 0009 palindrome number (简单) ✅
• 0011 container with most water (中等) ✅
• 0012 integer to roman (中等) ✅
• 0013 roman to integer (简单) ✅
• 0014 longest common prefix (简单) ✅
• 0015 3sum (中等) ✅
• 0016 3sum closest (中等) ✅
• 0017 letter combinations of a phone number (中等) ✅
• 0018 4sum (中等) ✅
• 0019 remove nth node from end of list (中等) ✅
• 0020 valid parentheses (简单) ✅
• 0021 merge two sorted lists (简单) ✅
• 0022 generate parentheses (中等) ✅
• 0023 merge k sorted lists (困难) ✅
• 0024 swap nodes in pairs (中等) ✅
• 0025 reverse nodes in k group (困难) ✅
• 0026 remove duplicates from sorted array (简单) ✅
• 0027 remove element (简单) ✅
• 0028 find the index of the first occurrence in a string (简单) ✅
• 0030 substring with concatenation of all words (困难) ✅
• 0031 next permutation (中等) ✅
• 0033 search in rotated sorted array (中等) ✅
• 0034 find first and last position of element in sorted array (中等) ✅
• 0035 search insert position (简单) ✅
• 0036 valid sudoku (中等) ✅
• 0039 combination sum (中等) ✅
• 0040 combination sum ii (中等) ✅
• 0041 first missing positive (困难) ✅
• 0042 trapping rain water (困难) ✅
• 0045 jump game ii (中等) ✅
• 0046 permutations (中等) ✅
• 0047 permutations ii (中等) ✅
• 0048 rotate image (中等) ✅
• 0049 group anagrams (中等) ✅
• 0050 pow(x, n) (中等) ✅
• 0053 maximum subarray (中等) ✅
• 0054 spiral matrix (中等) ✅
• 0055 jump game (中等) ✅
• 0056 merge intervals (中等) ✅
• 0058 length of last word (简单) ✅
• 0061 rotate list (中等) ✅
• 0062 unique paths (中等) ✅
• 0063 unique paths ii (中等) ✅
• 0064 minimum path sum (中等) ✅
• 0066 plus one (简单) ✅
• 0067 add binary (简单) ✅
• 0069 sqrt(x) (简单) ✅
• 0070 climbing stairs (简单) ✅
• 0071 simplify path (中等) ✅
• 0072 edit distance (中等) ✅
• 0073 set matrix zeroes (中等) ✅
• 0074 search a 2d matrix (中等) ✅
• 0075 sort colors (中等) ✅
• 0076 minimum window substring (困难) ✅
• 0077 combinations (中等) ✅
• 0078 subsets (中等) ✅
• 0079 word search (中等) ✅
• 0080 remove duplicates from sorted array ii (中等) ✅
• 0083 remove duplicates from sorted list (简单) ✅
• 0086 partition list (中等) ✅
• 0088 merge sorted array (简单) ✅
• 0091 decode ways (中等) ✅
• 0092 reverse linked list ii (中等) ✅
• 0094 binary tree inorder traversal (简单) ✅
• 0096 unique binary search trees (中等) ✅
• 0097 interleaving string (中等) ✅
• 0098 validate binary search tree (中等) ✅
• 0100 same tree (简单) ✅
• 0101 symmetric tree (简单) ✅
• 0102 binary tree level order traversal (中等) ✅
• 0103 binary tree zigzag level order traversal (中等) ✅
• 0104 maximum depth of binary tree (简单) ✅
• 0105 construct binary tree from preorder and inorder traversal (中等) ✅
• 0106 construct binary tree from inorder and postorder traversal (中等) ✅
• 0107 binary tree level order traversal ii (中等) ✅
• 0108 convert sorted array to binary search tree (简单) ✅
• 0110 balanced binary tree (简单) ✅
• 0111 minimum depth of binary tree (简单) ✅
• 0112 path sum (简单) ✅
• 0114 flatten binary tree to linked list (中等) ✅
• 0116 populating next right pointers in each node (中等) ✅
• 0117 populating next right pointers in each node ii (中等) ✅
• 0118 pascal's triangle (简单) ✅
• 0119 pascal's triangle ii (简单) ✅
• 0120 triangle (中等) ✅
• 0121 best time to buy and sell stock (简单) ✅
• 0122 best time to buy and sell stock ii (中等) ✅
• 0125 valid palindrome (简单) ✅
• 0128 longest consecutive sequence (中等) ✅
• 0134 gas station (中等) ✅
• 0135 candy (困难) ✅
• 0136 single number (简单) ✅
• 0137 single number ii (中等) ✅
• 0138 copy list with random pointer (中等) ✅
• 0139 word break (中等) ✅
• 0141 linked list cycle (简单) ✅
• 0142 linked list cycle ii (中等) ✅
• 0143 reorder list (中等) ✅
• 0144 binary tree preorder traversal (简单) ✅
• 0145 binary tree postorder traversal (简单) ✅
• 0146 lru cache (中等) ✅
• 0147 insertion sort list (中等) ✅
• 0148 sort list (中等) ✅
• 0150 evaluate reverse polish notation (中等) ✅
• 0151 reverse words in a string (中等) ✅
• 0153 find minimum in rotated sorted array (中等) ✅
• 0155 min stack (中等) ✅
• 0160 intersection of two linked lists (简单) ✅
• 0164 maximum gap (中等) ✅
• 0167 two sum ii input array is sorted (中等) ✅
• 0168 excel sheet column title (简单) ✅
• 0169 majority element (简单) ✅
• 0171 excel sheet column number (简单) ✅
• 0173 binary search tree iterator (中等) ✅
• 0175 combine two tables (简单) ✅
• 0176 second highest salary (中等) ✅
• 0177 nth highest salary (中等) ✅
• 0178 rank scores (中等) ✅
• 0179 largest number (中等) ✅
• 0181 employees earning more than their managers (简单) ✅
• 0182 duplicate emails (简单) ✅
• 0183 customers who never order (简单) ✅
• 0184 department highest salary (中等) ✅
• 0189 rotate array (中等) ✅
• 0191 number of 1 bits (简单) ✅
• 0192 word frequency (中等) ✅
• 0195 tenth line (简单) ✅
• 0197 rising temperature (简单) ✅
• 0198 house robber (中等) ✅
• 0199 binary tree right side view (中等) ✅
• 0201 bitwise and of numbers range (中等) ✅
• 0202 happy number (简单) ✅
• 0205 isomorphic strings (简单) ✅
• 0206 reverse linked list (简单) ✅
• 0208 implement trie (prefix tree) (中等) ✅
• 0209 minimum size subarray sum (中等) ✅
• 0215 kth largest element in an array (中等) ✅
• 0217 contains duplicate (简单) ✅
• 0219 contains duplicate ii (简单) ✅
• 0221 maximal square (中等) ✅
• 0225 implement stack using queues (简单) ✅
• 0226 invert binary tree (简单) ✅
• 0227 basic calculator ii (中等) ✅
• 0228 summary ranges (简单) ✅
• 0229 majority element ii (中等) ✅
• 0230 kth smallest element in a bst (中等) ✅
• 0231 power of two (简单) ✅
• 0232 implement queue using stacks (简单) ✅
• 0234 palindrome linked list (简单) ✅
• 0236 lowest common ancestor of a binary tree (中等) ✅
• 0237 delete node in a linked list (中等) ✅
• 0238 product of array except self (中等) ✅
• 0239 sliding window maximum (困难) ✅
• 0240 search a 2d matrix ii (中等) ✅
• 0242 valid anagram (简单) ✅
• 0257 binary tree paths (简单) ✅
• 0268 missing number (简单) ✅
• 0274 h index (中等) ✅
• 0278 first bad version (简单) ✅
• 0279 perfect squares (中等) ✅
• 0283 move zeroes (简单) ✅
• 0287 find the duplicate number (中等) ✅
• 0290 word pattern (简单) ✅
• 0292 nim game (简单) ✅
• 0300 longest increasing subsequence (中等) ✅
• 0303 range sum query immutable (简单) ✅
• 0316 remove duplicate letters (中等) ✅
• 0322 coin change (中等) ✅
• 0324 wiggle sort ii (中等) ✅
• 0331 verify preorder serialization of a binary tree (中等) ✅
• 0337 house robber iii (中等) ✅
• 0341 flatten nested list iterator (中等) ✅
• 0342 power of four (简单) ✅
• 0343 integer break (中等) ✅
• 0344 reverse string (简单) ✅
• 0347 top k frequent elements (中等) ✅
• 0349 intersection of two arrays (简单) ✅
• 0350 intersection of two arrays ii (简单) ✅
• 0371 sum of two integers (中等) ✅
• 0374 guess number higher or lower (简单) ✅
• 0377 combination sum iv (中等) ✅
• 0380 insert delete getrandom o(1) (中等) ✅
• 0383 ransom note (简单) ✅
• 0387 first unique character in a string (简单) ✅
• 0392 is subsequence (简单) ✅
• 0394 decode string (中等) ✅
• 0402 remove k digits (中等) ✅
• 0406 queue reconstruction by height (中等) ✅
• 0409 longest palindrome (简单) ✅
• 0414 third maximum number (简单) ✅
• 0415 add strings (简单) ✅
• 0437 path sum iii (中等) ✅
• 0438 find all anagrams in a string (中等) ✅
• 0445 add two numbers ii (中等) ✅
• 0448 find all numbers disappeared in an array (简单) ✅
• 0455 assign cookies (简单) ✅
• 0461 hamming distance (简单) ✅
• 0463 island perimeter (简单) ✅
• 0474 ones and zeroes (中等) ✅
• 0476 number complement (简单) ✅
• 0485 max consecutive ones (简单) ✅
• 0494 target sum (中等) ✅
• 0495 teemo attacking (简单) ✅
• 0496 next greater element i (简单) ✅
• 0500 keyboard row (简单) ✅
• 0506 relative ranks (简单) ✅
• 0516 longest palindromic subsequence (中等) ✅
• 0518 coin change ii (中等) ✅
• 0530 minimum absolute difference in bst (简单) ✅
• 0543 diameter of binary tree (简单) ✅
• 0557 reverse words in a string iii (简单) ✅
• 0560 subarray sum equals k (中等) ✅
• 0561 array partition (简单) ✅
• 0566 reshape the matrix (简单) ✅
• 0570 managers with at least 5 direct reports (中等) ✅
• 0577 employee bonus (简单) ✅
• 0595 big countries (简单) ✅
• 0605 can place flowers (简单) ✅
• 0627 swap sex of employees (简单) ✅
• 0637 average of levels in binary tree (简单) ✅
• 0646 maximum length of pair chain (中等) ✅
• 0647 palindromic substrings (中等) ✅
• 0657 robot return to origin (简单) ✅
• 0680 valid palindrome ii (简单) ✅
• 0682 baseball game (简单) ✅
• 0712 minimum ascii delete sum for two strings (中等) ✅
• 0721 accounts merge (中等) ✅
• 0724 find pivot index (简单) ✅
• 0728 self dividing numbers (简单) ✅
• 0729 my calendar i (中等) ✅
• 0740 delete and earn (中等) ✅
• 0742 to lower case (简单) ✅
• 0747 min cost climbing stairs (简单) ✅
• 0775 n ary tree preorder traversal (简单) ✅
• 0776 n ary tree postorder traversal (简单) ✅
• 0782 jewels and stones (简单) ✅
• 0792 binary search (简单) ✅
• 0806 domino and tromino tiling (中等) ✅
• 0822 unique morse code words (简单) ✅
• 0859 design circular deque (中等) ✅
• 0861 flipping an image (简单) ✅
• 0874 backspace string compare (简单) ✅
• 0882 peak index in a mountain array (中等) ✅
• 0890 lemonade change (简单) ✅
• 0908 middle of the linked list (简单) ✅
• 0932 monotonic array (简单) ✅
• 0933 increasing order search tree (简单) ✅
• 0935 orderly queue (困难) ✅
• 0941 sort array by parity (简单) ✅
• 0948 sort an array (中等) ✅
• 0958 sort array by parity ii (简单) ✅
• 0965 unique email addresses (简单) ✅
• 0967 minimum falling path sum (中等) ✅
• 0979 di string match (简单) ✅
• 0981 delete columns to make sorted (简单) ✅
• 0983 validate stack sequences (中等) ✅
• 1001 n repeated element in size 2n array (简单) ✅
• 1013 fibonacci number (简单) ✅
• 1025 minimum cost for tickets (中等) ✅
• 1078 remove outermost parentheses (简单) ✅
• 1086 divisor game (简单) ✅
• 1087 longest arithmetic subsequence (中等) ✅
• 1105 uncrossed lines (中等) ✅
• 1128 remove all adjacent duplicates in string (简单) ✅
• 1171 shortest path in binary matrix (中等) ✅
• 1179 game play analysis i (简单) ✅
• 1182 game play analysis iv (中等) ✅
• 1203 print in order (简单) ✅
• 1236 n th tribonacci number (简单) ✅
• 1250 longest common subsequence (中等) ✅
• 1330 longest arithmetic subsequence of given difference (中等) ✅
• 1570 final prices with a special discount in a shop (简单) ✅
• 1666 make the string great (简单) ✅
• 1720 crawler log folder (简单) ✅
• 1737 maximum nesting depth of the parentheses (简单) ✅
• 1802 number of students unable to eat lunch (简单) ✅
• 1833 find the highest altitude (简单) ✅
• 1895 minimum number of operations to move all balls to each box (中等) ✅
• 1904 second largest digit in a string (简单) ✅
• 2058 concatenation of array (简单) ✅
• 2102 find the middle index in array (简单) ✅
• 2128 reverse prefix of word (简单) ✅
• 2262 solving questions with brainpower (中等) ✅
• 2479 meeting rooms iii (困难) ✅
• 2562 count ways to build good strings (中等) ✅
• 2589 maximum value of a string in an array (简单) ✅
• 2616 maximal score after applying k operations (中等) ✅
• 2758 check if object instance of class (中等) ✅
• 2767 maximum sum with exactly k elements (简单) ✅
• 2800 minimum string length after removing substrings (简单) ✅
• 2816 lexicographically smallest palindrome (简单) ✅
• 2819 remove trailing zeros from a string (简单) ✅
• 2917 count pairs whose sum is less than target (简单) ✅
• 3447 clear digits (简单) ✅
• 100164 palindrome linked list lcci (简单) ✅
• 100169 min stack lcci (简单) ✅
• 100170 implement queue using stacks lcci (简单) ✅
• 100172 three in one lcci (简单) ✅
• 100185 rotate matrix lcci (中等) ✅
• 100186 zero matrix lcci (中等) ✅
• 100197 three steps problem lcci (简单) ✅
• 100273 图书整理 ii (简单) ✅
• 100274 斐波那契数 (简单) ✅
• 100277 跳跃训练 (简单) ✅
• 100280 路径加密 (简单) ✅
• 100282 图书整理 i (简单) ✅
• 100302 最小栈 (简单) ✅
• 1000003 contiguous sequence lcci (简单) ✅
• 1000019 binode lcci (简单) ✅
• 1000021 smallest k lcci (中等) ✅
• 1000046 max submatrix lcci (困难) ✅
• 1000231 二进制求和 (简单) ✅
• 1000234 全排列 (中等) ✅
• 1000235 全排列 ii (中等) ✅
• 1000243 使用最小花费爬楼梯 (简单) ✅
• 1000252 无重复字符的最长子串 (中等) ✅
• 1000263 回文链表 (简单) ✅
• 1000311 递增顺序搜索树 (简单) ✅
• 1000324 前 k 个高频元素 (中等) ✅
• 1000434 烹饪料理 (简单) ✅

简单

• 0001 two sum ✅
• 0009 palindrome number ✅
• 0013 roman to integer ✅
• 0014 longest common prefix ✅
• 0020 valid parentheses ✅
• 0021 merge two sorted lists ✅
• 0026 remove duplicates from sorted array ✅
• 0027 remove element ✅
• 0028 find the index of the first occurrence in a string ✅
• 0035 search insert position ✅
• 0058 length of last word ✅
• 0066 plus one ✅
• 0067 add binary ✅
• 0069 sqrt(x) ✅
• 0070 climbing stairs ✅
• 0083 remove duplicates from sorted list ✅
• 0088 merge sorted array ✅
• 0094 binary tree inorder traversal ✅
• 0100 same tree ✅
• 0101 symmetric tree ✅
• 0104 maximum depth of binary tree ✅
• 0108 convert sorted array to binary search tree ✅
• 0110 balanced binary tree ✅
• 0111 minimum depth of binary tree ✅
• 0112 path sum ✅
• 0118 pascal's triangle ✅
• 0119 pascal's triangle ii ✅
• 0121 best time to buy and sell stock ✅
• 0125 valid palindrome ✅
• 0136 single number ✅
• 0141 linked list cycle ✅
• 0144 binary tree preorder traversal ✅
• 0145 binary tree postorder traversal ✅
• 0160 intersection of two linked lists ✅
• 0168 excel sheet column title ✅
• 0169 majority element ✅
• 0171 excel sheet column number ✅
• 0175 combine two tables ✅
• 0181 employees earning more than their managers ✅
• 0182 duplicate emails ✅
• 0183 customers who never order ✅
• 0191 number of 1 bits ✅
• 0195 tenth line ✅
• 0197 rising temperature ✅
• 0202 happy number ✅
• 0205 isomorphic strings ✅
• 0206 reverse linked list ✅
• 0217 contains duplicate ✅
• 0219 contains duplicate ii ✅
• 0225 implement stack using queues ✅
• 0226 invert binary tree ✅
• 0228 summary ranges ✅
• 0231 power of two ✅
• 0232 implement queue using stacks ✅
• 0234 palindrome linked list ✅
• 0242 valid anagram ✅
• 0257 binary tree paths ✅
• 0268 missing number ✅
• 0278 first bad version ✅
• 0283 move zeroes ✅
• 0290 word pattern ✅
• 0292 nim game ✅
• 0303 range sum query immutable ✅
• 0342 power of four ✅
• 0344 reverse string ✅
• 0349 intersection of two arrays ✅
• 0350 intersection of two arrays ii ✅
• 0374 guess number higher or lower ✅
• 0383 ransom note ✅
• 0387 first unique character in a string ✅
• 0392 is subsequence ✅
• 0409 longest palindrome ✅
• 0414 third maximum number ✅
• 0415 add strings ✅
• 0448 find all numbers disappeared in an array ✅
• 0455 assign cookies ✅
• 0461 hamming distance ✅
• 0463 island perimeter ✅
• 0476 number complement ✅
• 0485 max consecutive ones ✅
• 0495 teemo attacking ✅
• 0496 next greater element i ✅
• 0500 keyboard row ✅
• 0506 relative ranks ✅
• 0530 minimum absolute difference in bst ✅
• 0543 diameter of binary tree ✅
• 0557 reverse words in a string iii ✅
• 0561 array partition ✅
• 0566 reshape the matrix ✅
• 0577 employee bonus ✅
• 0595 big countries ✅
• 0605 can place flowers ✅
• 0627 swap sex of employees ✅
• 0637 average of levels in binary tree ✅
• 0657 robot return to origin ✅
• 0680 valid palindrome ii ✅
• 0682 baseball game ✅
• 0724 find pivot index ✅
• 0728 self dividing numbers ✅
• 0742 to lower case ✅
• 0747 min cost climbing stairs ✅
• 0775 n ary tree preorder traversal ✅
• 0776 n ary tree postorder traversal ✅
• 0782 jewels and stones ✅
• 0792 binary search ✅
• 0822 unique morse code words ✅
• 0861 flipping an image ✅
• 0874 backspace string compare ✅
• 0890 lemonade change ✅
• 0908 middle of the linked list ✅
• 0932 monotonic array ✅
• 0933 increasing order search tree ✅
• 0941 sort array by parity ✅
• 0958 sort array by parity ii ✅
• 0965 unique email addresses ✅
• 0979 di string match ✅
• 0981 delete columns to make sorted ✅
• 1001 n repeated element in size 2n array ✅
• 1013 fibonacci number ✅
• 1078 remove outermost parentheses ✅
• 1086 divisor game ✅
• 1128 remove all adjacent duplicates in string ✅
• 1179 game play analysis i ✅
• 1203 print in order ✅
• 1236 n th tribonacci number ✅
• 1570 final prices with a special discount in a shop ✅
• 1666 make the string great ✅
• 1720 crawler log folder ✅
• 1737 maximum nesting depth of the parentheses ✅
• 1802 number of students unable to eat lunch ✅
• 1833 find the highest altitude ✅
• 1904 second largest digit in a string ✅
• 2058 concatenation of array ✅
• 2102 find the middle index in array ✅
• 2128 reverse prefix of word ✅
• 2589 maximum value of a string in an array ✅
• 2767 maximum sum with exactly k elements ✅
• 2800 minimum string length after removing substrings ✅
• 2816 lexicographically smallest palindrome ✅
• 2819 remove trailing zeros from a string ✅
• 2917 count pairs whose sum is less than target ✅
• 3447 clear digits ✅
• 100164 palindrome linked list lcci ✅
• 100169 min stack lcci ✅
• 100170 implement queue using stacks lcci ✅
• 100172 three in one lcci ✅
• 100197 three steps problem lcci ✅
• 100273 图书整理 ii ✅
• 100274 斐波那契数 ✅
• 100277 跳跃训练 ✅
• 100280 路径加密 ✅
• 100282 图书整理 i ✅
• 100302 最小栈 ✅
• 1000003 contiguous sequence lcci ✅
• 1000019 binode lcci ✅
• 1000231 二进制求和 ✅
• 1000243 使用最小花费爬楼梯 ✅
• 1000263 回文链表 ✅
• 1000311 递增顺序搜索树 ✅
• 1000434 烹饪料理 ✅

中等

• 0002 add two numbers ✅
• 0003 longest substring without repeating characters ✅
• 0005 longest palindromic substring ✅
• 0006 zigzag conversion ✅
• 0007 reverse integer ✅
• 0008 string to integer (atoi) ✅
• 0011 container with most water ✅
• 0012 integer to roman ✅
• 0015 3sum ✅
• 0016 3sum closest ✅
• 0017 letter combinations of a phone number ✅
• 0018 4sum ✅
• 0019 remove nth node from end of list ✅
• 0022 generate parentheses ✅
• 0024 swap nodes in pairs ✅
• 0031 next permutation ✅
• 0033 search in rotated sorted array ✅
• 0034 find first and last position of element in sorted array ✅
• 0036 valid sudoku ✅
• 0039 combination sum ✅
• 0040 combination sum ii ✅
• 0045 jump game ii ✅
• 0046 permutations ✅
• 0047 permutations ii ✅
• 0048 rotate image ✅
• 0049 group anagrams ✅
• 0050 pow(x, n) ✅
• 0053 maximum subarray ✅
• 0054 spiral matrix ✅
• 0055 jump game ✅
• 0056 merge intervals ✅
• 0061 rotate list ✅
• 0062 unique paths ✅
• 0063 unique paths ii ✅
• 0064 minimum path sum ✅
• 0071 simplify path ✅
• 0072 edit distance ✅
• 0073 set matrix zeroes ✅
• 0074 search a 2d matrix ✅
• 0075 sort colors ✅
• 0077 combinations ✅
• 0078 subsets ✅
• 0079 word search ✅
• 0080 remove duplicates from sorted array ii ✅
• 0086 partition list ✅
• 0091 decode ways ✅
• 0092 reverse linked list ii ✅
• 0096 unique binary search trees ✅
• 0097 interleaving string ✅
• 0098 validate binary search tree ✅
• 0102 binary tree level order traversal ✅
• 0103 binary tree zigzag level order traversal ✅
• 0105 construct binary tree from preorder and inorder traversal ✅
• 0106 construct binary tree from inorder and postorder traversal ✅
• 0107 binary tree level order traversal ii ✅
• 0114 flatten binary tree to linked list ✅
• 0116 populating next right pointers in each node ✅
• 0117 populating next right pointers in each node ii ✅
• 0120 triangle ✅
• 0122 best time to buy and sell stock ii ✅
• 0128 longest consecutive sequence ✅
• 0134 gas station ✅
• 0137 single number ii ✅
• 0138 copy list with random pointer ✅
• 0139 word break ✅
• 0142 linked list cycle ii ✅
• 0143 reorder list ✅
• 0146 lru cache ✅
• 0147 insertion sort list ✅
• 0148 sort list ✅
• 0150 evaluate reverse polish notation ✅
• 0151 reverse words in a string ✅
• 0153 find minimum in rotated sorted array ✅
• 0155 min stack ✅
• 0164 maximum gap ✅
• 0167 two sum ii input array is sorted ✅
• 0173 binary search tree iterator ✅
• 0176 second highest salary ✅
• 0177 nth highest salary ✅
• 0178 rank scores ✅
• 0179 largest number ✅
• 0184 department highest salary ✅
• 0189 rotate array ✅
• 0192 word frequency ✅
• 0198 house robber ✅
• 0199 binary tree right side view ✅
• 0201 bitwise and of numbers range ✅
• 0208 implement trie (prefix tree) ✅
• 0209 minimum size subarray sum ✅
• 0215 kth largest element in an array ✅
• 0221 maximal square ✅
• 0227 basic calculator ii ✅
• 0229 majority element ii ✅
• 0230 kth smallest element in a bst ✅
• 0236 lowest common ancestor of a binary tree ✅
• 0237 delete node in a linked list ✅
• 0238 product of array except self ✅
• 0240 search a 2d matrix ii ✅
• 0274 h index ✅
• 0279 perfect squares ✅
• 0287 find the duplicate number ✅
• 0300 longest increasing subsequence ✅
• 0316 remove duplicate letters ✅
• 0322 coin change ✅
• 0324 wiggle sort ii ✅
• 0331 verify preorder serialization of a binary tree ✅
• 0337 house robber iii ✅
• 0341 flatten nested list iterator ✅
• 0343 integer break ✅
• 0347 top k frequent elements ✅
• 0371 sum of two integers ✅
• 0377 combination sum iv ✅
• 0380 insert delete getrandom o(1) ✅
• 0394 decode string ✅
• 0402 remove k digits ✅
• 0406 queue reconstruction by height ✅
• 0437 path sum iii ✅
• 0438 find all anagrams in a string ✅
• 0445 add two numbers ii ✅
• 0474 ones and zeroes ✅
• 0494 target sum ✅
• 0516 longest palindromic subsequence ✅
• 0518 coin change ii ✅
• 0560 subarray sum equals k ✅
• 0570 managers with at least 5 direct reports ✅
• 0646 maximum length of pair chain ✅
• 0647 palindromic substrings ✅
• 0712 minimum ascii delete sum for two strings ✅
• 0721 accounts merge ✅
• 0729 my calendar i ✅
• 0740 delete and earn ✅
• 0806 domino and tromino tiling ✅
• 0859 design circular deque ✅
• 0882 peak index in a mountain array ✅
• 0948 sort an array ✅
• 0967 minimum falling path sum ✅
• 0983 validate stack sequences ✅
• 1025 minimum cost for tickets ✅
• 1087 longest arithmetic subsequence ✅
• 1105 uncrossed lines ✅
• 1171 shortest path in binary matrix ✅
• 1182 game play analysis iv ✅
• 1250 longest common subsequence ✅
• 1330 longest arithmetic subsequence of given difference ✅
• 1895 minimum number of operations to move all balls to each box ✅
• 2262 solving questions with brainpower ✅
• 2562 count ways to build good strings ✅
• 2616 maximal score after applying k operations ✅
• 2758 check if object instance of class ✅
• 100185 rotate matrix lcci ✅
• 100186 zero matrix lcci ✅
• 1000021 smallest k lcci ✅
• 1000234 全排列 ✅
• 1000235 全排列 ii ✅
• 1000252 无重复字符的最长子串 ✅
• 1000324 前 k 个高频元素 ✅

困难

• 0004 median of two sorted arrays ✅
• 0023 merge k sorted lists ✅
• 0025 reverse nodes in k group ✅
• 0030 substring with concatenation of all words ✅
• 0041 first missing positive ✅
• 0042 trapping rain water ✅
• 0076 minimum window substring ✅
• 0135 candy ✅
• 0239 sliding window maximum ✅
• 0935 orderly queue ✅
• 2479 meeting rooms iii ✅
• 1000046 max submatrix lcci ✅

按语言统计解决方案

• java: 328 个