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ed716f0 (2), thesixonenine (2), 263 (2), codespace (2), xcode (2), cli (2), https (2), may (2), default (2), refname (2), show (2), could (2), fork (2), outside (2), insights (2), projects (2), notifications (2), manage (2), jan (2), action, api, contact, docs, status, privacy, terms, inc, python, javascript, css, scss, languages, published, watching, 635, watchers, competitions, algo, 扫描线, 这类题目需要将一些操作排序, 然后从左到右用一根扫描线扫过去最典型的就是矩形面积并, 周长并等题, picture, atlantis, 区间合并, 这类题目会询问区间中满足条件的连续最长区间, 所以pushup的时候需要对左右儿子的区间进行合并, 区间替换, 询问满足条件的最左端点, 3667, hotel, 区间更新, 由于只query一次总区间, 所以可以直接输出, 结点的信息, 成段增减, 区间异或, 3225, 2528, mayor, posters, 3468, just, hook, 单点更新, 单点替换, 区间最值, 区间求最大值的位子, 直接把update的操作在query里做了, 2795, inversion, hate, 敌兵布阵, 线段树, 从简单到困难, 灵活构建线段树, 线段树节点可以存储多条信息, 合并两个节点的, 操作也可以是多样的, 850, 离散化需要注意一个特殊情况, 假如三个区间为, 离散化后, 第一个区间为, 第二个区间为, 第三个区间为, 这样一来, 这和离散前的模型不符, 离散前, 很明显, 正确的做法是, 在相差大于, 的数间加一个数, 例如在上面, 中间加, 这样处理之后, 区间一是, 区间二是, 区间三是, 区间懒惰更新, 线段树的树的实现写法, 715, 732, 计数线段树的经典写法, 315, 327, 493, 线段树的经典数组实现写法, 将合并两个节点, 逻辑抽象出来了, 可以实现任意操作, 常见的操作有, 303, 307, 滑动窗口经典题, 239, 480, 能用并查集的题目, 一般也可以用, 只不过时间复杂度会高一点, 关于地图, 网格的题目, 可以新建一个特殊节点, 将四周边缘的砖块或者网格都, 到这个特殊节点上, 灵活的抽象题目给的信息, 将给定的信息合理的编号, 使用并查集解题, 降低时间复杂度, 有些题死套模板反而做不出来, 比如第, 685, 这一题不能路径压缩和秩优化, 因为题目中涉及到有向图, 需要知道节点的前驱节点, 如果路径压缩了, 这一题就没法做了, 这一题不需要路径压缩和秩优化, 并查集是一种思想, 有些题需要灵活使用这种思想, 而不是死套模板, 399, 这一题是, stringunionfind, 利用并查集思想实现的, 这里每个节点是基于字符串和, 而不是单纯的用, 节点编号实现的, 灵活使用并查集的思想, 熟练掌握并查集的, 模板中有两种并查集的实现方式, 一种是路径压缩, 秩优化的版本, 另外一种是计算每个集合中元素的个数, 最大集合元素个数的版本, 这两种版本都有各自使用的地方, 能使用第一类并查集模板的题目有, 128, 547, 684, 765, 778, 839, 924, 928, 947, 990, 能使用第二类并查集模板的题目有, 题秩优化和统计集合个数这些地方会卡时间, 如果不优化, tle, 判断是否是奇数, 将最低位, 得到最低位, 有特殊意义的, 位操作运算, 260, 201, 318, 371, 397, 461, 693, 最右边的, 位清零, 位的幂值, 最高位至第, 位至第, 构造特殊, mask, 将特殊位置放, 交换律, 结合律, 异或的特性, 136, 268, 389, 421, 饼子排序, 969, 两两不相邻的排序, 767, 摆动排序, 324, 桶排序和基数排序, 164, 链表的排序, 147, 和归并排序, 深刻的理解多路快排, 最大值最小化问题, 求在最小满足条件的情况下的最大值, 410, 875, 则左侧存在峰值, 则右侧存在峰值, peakindexinmountainarray, 在基本有序的数组中用二分搜索, 经典解法可以解, 变种写法也可以写, 常见的题型, 在山峰数组中找山峰, 在旋转有序数组中找分界点, 153, 154, 162, 852, 找到最后一个小于等于, searchlastlesselement, 二分查找最后一个小于等于, 找到第一个大于等于, searchfirstgreaterelement, 二分查找第一个大于等于, 找到最后一个与, searchlastequalelement, 二分查找最后一个与, 找到第一个与, searchfirstequalelement, 二分查找第一个与, 二分搜索的变种写法, 个基本变种, 查找最后一个小于等于, 查找第一个大于等于, 查找最后一个与, 查找第一个与, binarysearchmatrix, 二分搜索的经典写法, 需要注意的三点, 的更新, 的取值, 循环退出条件, 注意是, 而不是, updatematrix_bfs, 这里是去重的关键逻辑, ints, combinationsum2, 126, 127, 208, 211, 子集合问题, 四个方向搜索, 212, 980, 数独问题, 皇后终极解法, 二进制解法, 排列和组合杂交问题, 组合问题, 216, 排列问题, 526, 996, 456, 496, 503, 739, 901, 907, 利用栈维护一个单调递增或者递减的下标数组, 单调栈, 利用栈进行编码问题, 394, 682, 856, 880, 栈的基本, pop, 150, 155, 224, 225, 232, 946, 括号匹配问题及类似问题, 921, 判断链表是否存在环, 如果有环, 输出环的交叉点的下标, 个链表是否有交叉点, 如果有交叉点, 输出交叉点, 141, 160, 链表排序, 时间复杂度要求, 空间复杂度, 只有一种做法, 至顶向下归并, 链表归类, 328, 个有序链表, 链表寻找中间节点, 876, 链表寻找倒数第, 个节点, 只需要一次遍历就可以得到答案, 链表区间逆序, 灵活使用递归, 构造递归条件, 使用递归可以巧妙的解题, 不过需要注意有些题目不能使用递归, 因为递归深度太深会导致超时和栈溢出, 巧妙的构造虚拟头结点, 可以使遍历处理逻辑更加统一, 问题集, 167, 923, 替换字母以后, 相同字母能出现连续最长的长度, 快慢指针可以查找重复数字, 下面这些是免费的算法题, 但是暂时还不能使用, 解答的, bounds, 2443, 2442, 2441, 2440, 2439, 2438, 2437, 2436, 2435, 2434, 2433, worked, 2432, tastiness, purchased, 2431, 2430, 2429, hourglass, 2428, 2427, satisfying, inequality, 2426, pairings, 2425, uploaded, 2424, equalize, 2423, turn, 2422, 2421, 2420, 2419, 2418, 2417, 2416, 2415, alphabetical, 2414, 2413, 2412, 2411, trainers, 2410, 2409, sql, 2408, 2407, 2406, 2405, 2404, 2403, 2402, 2401, 2400, 2399, robots, 2398, 2397, 2396, 2395, deductions, 2394, 2393, 2392, garbage, 2391, 2390, 2389, null, 2388, wise, 2387, 2386, infected, 2385, 2384, hours, 2383, 2382, 2381, 2380, recolors, 2379, 2378, olympic, 2377, 2376, 2375, 2374, 2373, influence, salesperson, 2372, 2371, 2370, 2369, restrictions, 2368, 2367, replacements, 2366, 2365, 2364, 2363, invoice, 2362, costs, train, 2361, 2360, 2359, entering, 2358, subtracting, amounts, 2357, subjects, taught, teacher, 2356, take, 2355, excellent, 2354, 2353, 2352, 2351, impossible, 2350, 2349, filled, 2348, poker, 2347, compute, 2346, mountains, 2345, 2344, trimmed, 2343, 2342, 2341, 2340, 2339, 2338, 2337, infinite, 2336, cups, 2335, varying, 2334, squared, 2333, catch, 2332, 2331, 2330, 2329, 2328, aware, 2327, 2326, 2325, 2324, 2323, 2322, spliced, 2321, 2320, 2319, 2318, 2317, unreachable, 2316, asterisks, 2315, recorded, 2314, 2313, wood, 2312, 2311, 2310, upper, 2309, gender, 2308, contradictions, 2307, naming, 2306, 2305, 2304, paid, taxes, 2303, 2302, 2301, successful, spells, potions, 2300, 2299, weekend, 2298, 2297, editor, 2296, 2295, such, 2294, 2293, years, 2292, trading, stocks, 2291, 2290, 2289, 2288, 2287, booking, concert, 2286, roads, 2285, sender, 2284, 2283, seen, 2282, strength, wizards, 2281, 2280, bags, rocks, 2279, 2278, 2277, 2276, 2275, 2274, resultant, 2273, variance, 2272, carpet, 2271, 2270, 2269, keypresses, 2268, 2267, texts, 2266, 2265, 2264, 2263, appeal, 2262, 2261, 2260, 2259, spreading, fire, 2258, unguarded, 2257, 2256, 2255, 2254, unpivoting, 2253, pivoting, 2252, 2251, 2250, lattice, 2249, 2248, trip, highways, 2247, 2246, cornered, 2245, 2244, 2243, 2242, atm, 2241, pens, pencils, 2240, 2239, driver, passenger, 2238, brightness, 2237, 2236, 2235, gardens, 2234, 2233, 2232, 2231, 2230, 2229, purchases, seven, 2228, encrypt, 2227, allocated, 2226, losses, 2225, 2224, built, 2223, select, 2222, triangular, 2221, 2220, 2219, piles, 2218, 2217, 2216, 2215, health, beat, 2214, 2213, archery, 2212, collisions, road, 2211, hills, valleys, 2210, carpets, 2209, halve, 2208, 2207, 2206, 2205, 2204, weighted, subgraph, 2203, topmost, 2202, artifacts, extracted, 2201, 2200, 2199, 2198, coprime, 2197, descriptions, 2196, minimal, 2195, 2194, 2193, ancestors, acyclic, 2192, jumbled, 2191, following, 2190, 2189, 2188, 2187, 2186, 2185, sturdy, 2184, 2183, repeat, 2182, 2181, 2180, 2179, 2178, 2177, 2176, rankings, 2175, 2174, streak, 2173, 2172, beans, 2171, 2170, 2169, 2168, cars, illegal, goods, 2167, bitset, 2166, rearranged, 2165, 2164, 2163, cooking, 2162, according, 2161, 2160, 2159, painted, 2158, 2157, 2156, divisions, 2155, multiplying, 2154, 2153, 2152, statements, 2151, 2150, 2149, 2148, corridor, 2147, ranked, 2146, 2145, buying, 2144, 2143, 2142, computers, 2141, brainpower, 2140, 2139

Text of the page (random words):
making a large island 44 7 hard 0828 count unique characters of all substrings of a given string go 51 5 hard 0829 consecutive numbers sum 41 5 hard 0830 positions of large groups go 51 7 easy 0831 masking personal information 46 8 medium 0832 flipping an image go 80 3 easy 0833 find and replace in string 54 1 medium 0834 sum of distances in tree go 54 1 hard 0835 image overlap 61 0 medium 0836 rectangle overlap go 43 3 easy 0837 new 21 game 36 2 medium 0838 push dominoes go 57 0 medium 0839 similar string groups go 47 5 hard 0840 magic squares in grid 38 5 medium 0841 keys and rooms go 70 1 medium 0842 split array into fibonacci sequence go 38 2 medium 0843 guess the word 42 0 hard 0844 backspace string compare go 48 0 easy 0845 longest mountain in array go 40 1 medium 0846 hand of straights go 56 5 medium 0847 shortest path visiting all nodes 61 3 hard 0848 shifting letters 45 4 medium 0849 maximize distance to closest person 47 6 medium 0850 rectangle area ii go 53 7 hard 0851 loud and rich go 58 1 medium 0852 peak index in a mountain array go 69 5 medium 0853 car fleet go 50 0 medium 0854 k similar strings 40 0 hard 0855 exam room 43 5 medium 0856 score of parentheses go 65 1 medium 0857 minimum cost to hire k workers 52 0 hard 0858 mirror reflection 63 3 medium 0859 buddy strings go 29 0 easy 0860 lemonade change 52 8 easy 0861 score after flipping matrix 75 1 medium 0862 shortest subarray with sum at least k go 26 1 hard 0863 all nodes distance k in binary tree go 62 1 medium 0864 shortest path to get all keys go 45 3 hard 0865 smallest subtree with all the deepest nodes 68 5 medium 0866 prime palindrome 25 8 medium 0867 transpose matrix go 63 4 easy 0868 binary gap 61 9 easy 0869 reordered power of 2 go 64 1 medium 0870 advantage shuffle go 51 6 medium 0871 minimum number of refueling stops 39 9 hard 0872 leaf similar trees go 65 2 easy 0873 length of longest fibonacci subsequence 48 6 medium 0874 walking robot simulation go 38 3 medium 0875 koko eating bananas go 52 4 medium 0876 middle of the linked list go 73 7 easy 0877 stone game go 69 7 medium 0878 nth magical number go 35 7 hard 0879 profitable schemes 40 5 hard 0880 decoded string at index go 28 3 medium 0881 boats to save people go 52 7 medium 0882 reachable nodes in subdivided graph 50 3 hard 0883 projection area of 3d shapes 70 7 easy 0884 uncommon words from two sentences go 65 9 easy 0885 spiral matrix iii go 73 0 medium 0886 possible bipartition 48 4 medium 0887 super egg drop go 27 2 hard 0888 fair candy swap go 60 5 easy 0889 construct binary tree from preorder and postorder traversal 70 8 medium 0890 find and replace pattern go 77 9 medium 0891 sum of subsequence widths go 36 4 hard 0892 surface area of 3d shapes go 63 0 easy 0893 groups of special equivalent strings 70 8 medium 0894 all possible full binary trees 80 0 medium 0895 maximum frequency stack go 66 8 hard 0896 monotonic array go 58 2 easy 0897 increasing order search tree go 78 4 easy 0898 bitwise ors of subarrays go 36 8 medium 0899 orderly queue 59 0 hard 0900 rle iterator 59 5 medium 0901 online stock span go 63 9 medium 0902 numbers at most n given digit set 41 4 hard 0903 valid permutations for di sequence 57 7 hard 0904 fruit into baskets go 42 6 medium 0905 sort array by parity 75 7 easy 0906 super palindromes 39 2 hard 0907 sum of subarray minimums go 34 3 medium 0908 smallest range i 67 6 easy 0909 snakes and ladders go 40 8 medium 0910 smallest range ii go 34 4 medium 0911 online election go 52 1 medium 0912 sort an array 60 0 medium 0913 cat and mouse 35 3 hard 0914 x of a kind in a deck of cards go 32 2 easy 0915 partition array into disjoint intervals 48 6 medium 0916 word subsets go 54 1 medium 0917 reverse only letters 61 4 easy 0918 maximum sum circular subarray go 38 1 medium 0919 complete binary tree inserter 64 9 medium 0920 number of music playlists go 50 6 hard 0921 minimum add to make parentheses valid go 76 4 medium 0922 sort array by parity ii go 70 7 easy 0923 3sum with multiplicity go 45 4 medium 0924 minimize malware spread go 42 1 hard 0925 long pressed name go 33 8 easy 0926 flip string to monotone increasing 59 6 medium 0927 three equal parts go 39 6 hard 0928 minimize malware spread ii go 42 6 hard 0929 unique email addresses 67 2 easy 0930 binary subarrays with sum go 50 9 medium 0931 minimum falling path sum 68 4 medium 0932 beautiful array 65 1 medium 0933 number of recent calls go 73 2 easy 0934 shortest bridge 53 9 medium 0935 knight dialer 49 9 medium 0936 stamping the sequence 63 3 hard 0937 reorder data in log files 56 4 medium 0938 range sum of bst go 85 3 easy 0939 minimum area rectangle 53 2 medium 0940 distinct subsequences ii 44 4 hard 0941 valid mountain array 33 5 easy 0942 di string match go 76 6 easy 0943 find the shortest superstring 45 0 hard 0944 delete columns to make sorted 69 7 easy 0945 minimum increment to make array unique 49 8 medium 0946 validate stack sequences go 67 6 medium 0947 most stones removed with same row or column go 57 0 medium 0948 bag of tokens 52 0 medium 0949 largest time for given digits go 35 2 medium 0950 reveal cards in increasing order 77 6 medium 0951 flip equivalent binary trees 66 8 medium 0952 largest component size by common factor go 40 3 hard 0953 verifying an alien dictionary go 52 7 easy 0954 array of doubled pairs 39 1 medium 0955 delete columns to make sorted ii 34 6 medium 0956 tallest billboard 40 0 hard 0957 prison cells after n days 39 2 medium 0958 check completeness of a binary tree go 53 8 medium 0959 regions cut by slashes go 69 1 medium 0960 delete columns to make sorted iii 57 1 hard 0961 n repeated element in size 2n array go 75 8 easy 0962 maximum width ramp 48 9 medium 0963 minimum area rectangle ii 54 7 medium 0964 least operators to express number 47 8 hard 0965 univalued binary tree 69 2 easy 0966 vowel spellchecker go 51 5 medium 0967 numbers with same consecutive differences 57 0 medium 0968 binary tree cameras go 46 8 hard 0969 pancake sorting go 70 0 medium 0970 powerful integers go 43 6 medium 0971 flip binary tree to match preorder traversal go 49 9 medium 0972 equal rational numbers 43 0 hard 0973 k closest points to origin go 65 9 medium 0974 subarray sums divisible by k 53 6 medium 0975 odd even jump 38 9 hard 0976 largest perimeter triangle go 54 8 easy 0977 squares of a sorted array go 71 9 easy 0978 longest turbulent subarray go 47 4 medium 0979 distribute coins in binary tree go 72 0 medium 0980 unique paths iii go 79 6 hard 0981 time based key value store go 53 6 medium 0982 triples with bitwise and equal to zero 57 6 hard 0983 minimum cost for tickets 64 4 medium 0984 string without aaa or bbb go 42 9 medium 0985 sum of even numbers after queries go 68 3 medium 0986 interval list intersections go 71 4 medium 0987 vertical order traversal of a binary tree go 44 6 hard 0988 smallest string starting from leaf 49 6 medium 0989 add to array form of integer go 45 5 easy 0990 satisfiability of equality equations go 50 7 medium 0991 broken calculator go 54 1 medium 0992 subarrays with k different integers go 54 3 hard 0993 cousins in binary tree go 54 1 easy 0994 rotting oranges 52 4 medium 0995 minimum number of k consecutive bit flips go 51 1 hard 0996 number of squareful arrays go 49 2 hard 0997 find the town judge go 49 4 easy 0998 maximum binary tree ii 66 3 medium 0999 available captures for rook go 67 8 easy 1000 minimum cost to merge stones 42 3 hard 1001 grid illumination 36 2 hard 1002 find common characters go 68 3 easy 1003 check if word is valid after substitutions go 58 2 medium 1004 max consecutive ones iii go 63 5 medium 1005 maximize sum of array after k negations go 51 1 easy 1006 clumsy factorial go 54 7 medium 1007 minimum domino rotations for equal row 52 4 medium 1008 construct binary search tree from preorder traversal 80 9 medium 1009 complement of base 10 integer go 62 0 easy 1010 pairs of songs with total durations divisible by 60 go 53 0 medium 1011 capacity to ship packages within d days go 64 4 medium 1012 numbers with repeated digits 40 4 hard 1013 partition array into three parts with equal sum 43 5 easy 1014 best sightseeing pair 59 5 medium 1015 smallest integer divisible by k 47 1 medium 1016 binary string with substrings representing 1 to n 57 6 medium 1017 convert to base 2 go 60 9 medium 1018 binary prefix divisible by 5 go 47 4 easy 1019 next greater node in linked list go 59 8 medium 1020 number of enclaves go 64 8 medium 1021 remove outermost parentheses go 80 1 easy 1022 sum of root to leaf binary numbers go 73 8 easy 1023 camelcase matching 60 1 medium 1024 video stitching 50 5 medium 1025 divisor game go 67 1 easy 1026 maximum difference between node and ancestor go 73 4 medium 1027 longest arithmetic subsequence 47 2 medium 1028 recover a tree from preorder traversal go 72 8 hard 1029 two city scheduling 64 5 medium 1030 matrix cells in distance order go 69 3 easy 1031 maximum sum of two non overlapping subarrays 59 4 medium 1032 stream of characters 51 5 hard 1033 moving stones until consecutive 45 6 medium 1034 coloring a border go 48 9 medium 1035 uncrossed lines 58 7 medium 1036 escape a large maze 34 2 hard 1037 valid boomerang go 37 5 easy 1038 binary search tree to greater sum tree go 85 3 medium 1039 minimum score triangulation of polygon 54 5 medium 1040 moving stones until consecutive ii go 55 6 medium 1041 robot bounded in circle 55 3 medium 1042 flower planting with no adjacent 50 4 medium 1043 partition array for maximum sum 71 2 medium 1044 longest duplicate substring 30 7 hard 1045 customers who bought all products 67 6 medium 1046 last stone weight 64 7 easy 1047 remove all adjacent duplicates in string go 70 5 easy 1048 longest string chain go 59 2 medium 1049 last stone weight ii go 52 4 medium 1050 actors and directors who cooperated at least three times 72 4 easy 1051 height checker go 75 0 easy 1052 grumpy bookstore owner go 57 0 medium 1053 previous permutation with one swap 50 8 medium 1054 distant barcodes go 45 7 medium 1055 shortest way to form string 59 1 medium 1056 confusing number 46 1 easy 1057 campus bikes 57 7 medium 1058 minimize rounding error to meet target 44 9 medium 1059 all paths from source lead to destination 40 5 medium 1060 missing element in sorted array 54 6 medium 1061 lexicographically smallest equivalent string 70 4 medium 1062 longest repeating substring 59 1 medium 1063 number of valid subarrays 74 1 hard 1064 fixed point 63 6 easy 1065 index pairs of a string 63 0 easy 1066 campus bikes ii 54 5 medium 1067 digit count in range 44 6 hard 1068 product sales analysis i 80 4 easy 1069 product sales analysis ii 82 0 easy 1070 product sales analysis iii 49 2 medium 1071 greatest common divisor of strings 51 0 easy 1072 flip columns for maximum number of equal rows 63 1 medium 1073 adding two negabinary numbers go 36 4 medium 1074 number of submatrices that sum to target go 69 8 hard 1075 project employees i 67 2 easy 1076 project employees ii 51 0 easy 1077 project employees iii 78 7 medium 1078 occurrences after bigram go 63 9 easy 1079 letter tile possibilities go 76 1 medium 1080 insufficient nodes in root to leaf paths 52 8 medium 1081 smallest subsequence of distinct characters 57 6 medium 1082 sales analysis i 75 4 easy 1083 sales analysis ii 50 5 easy 1084 sales analysis iii 52 2 easy 1085 sum of digits in the minimum number 75 9 easy 1086 high five 75 2 easy 1087 brace expansion 66 1 medium 1088 confusing number ii 46 5 hard 1089 duplicate zeros go 51 5 easy 1090 largest values from labels 60 9 medium 1091 shortest path in binary matrix go 44 5 medium 1092 shortest common supersequence 57 8 hard 1093 statistics from a large sample go 44 7 medium 1094 car pooling 57 4 medium 1095 find in mountain array 35 8 hard 1096 brace expansion ii 63 5 hard 1097 game play analysis v 55 2 hard 1098 unpopular books 45 2 medium 1099 two sum less than k 60 4 easy 1100 find k length substrings with no repeated characters 74 7 medium 1101 the earliest moment when everyone become friends 65 0 medium 1102 path with maximum minimum value 53 3 medium 1103 distribute candies to people 63 9 easy 1104 path in zigzag labelled binary tree go 74 9 medium 1105 filling bookcase shelves go 58 9 medium 1106 parsing a boolean expression 58 5 hard 1107 new users daily count 45 9 medium 1108 defanging an ip address go 89 3 easy 1109 corporate flight bookings 60 3 medium 1110 delete nodes and return forest go 69 4 medium 1111 maximum nesting depth of two valid parentheses strings go 73 3 medium 1112 highest grade for each student 73 8 medium 1113 reported posts 66 1 easy 1114 print in order 68 1 easy 1115 print foobar alternately 61 7 medium 1116 print zero even odd 60 1 medium 1117 building h2o 55 7 medium 1118 number of days in a month 56 7 easy 1119 remove vowels from a string 90 7 easy 1120 maximum average subtree 65 5 medium 1121 divide array into increasing sequences 60 0 hard 1122 relative sort array go 68 4 easy 1123 lowest common ancestor of deepest leaves go 70 6 medium 1124 longest well performing interval 34 6 medium 1125 smallest sufficient team 47 1 hard 1126 active businesses 67 9 medium 1127 user purchase platform 51 2 hard 1128 number of equivalent domino pairs go 46 9 easy 1129 shortest path with alternating colors 42 9 medium 1130 minimum cost tree from leaf values 68 5 medium 1131 maximum of absolute value expression 49 5 medium 1132 reported posts ii 33 6 medium 1133 largest unique number 67 5 easy 1134 armstrong number 78 1 easy 1135 connecting cities with minimum cost 61 1 medium 1136 parallel courses 62 0 medium 1137 n th tribonacci number go 63 3 easy 1138 alphabet board path 52 3 medium 1139 largest 1 bordered square 50 0 medium 1140 stone game ii 64 9 medium 1141 user activity for the past 30 days i 50 2 easy 1142 user activity for the past 30 days ii 36 0 easy 1143 longest common subsequence go 58 8 medium 1144 decrease elements to make array zigzag 47 0 medium 1145 binary tree coloring game go 51 4 medium 1146 snapshot array 37 3 medium 1147 longest chunked palindrome decomposition 60 0 hard 1148 article views i 77 0 easy 1149 article views ii 47 6 medium 1150 check if a number is majority element in a sorted array 56 8 easy 1151 minimum swaps to group all 1 s together 60 9 medium 1152 analyze user website visit pattern 43 4 medium 1153 string transforms into another string 35 3 hard 1154 day of the year go 50 3 easy 1155 number of dice rolls with target sum 53 6 medium 1156 swap for longest repeated character substring 45 5 medium 1157 online majority element in subarray go 42 0 hard 1158 market analysis i 63 9 medium 1159 market analysis ii 58 7 hard 1160 find words that can be formed by characters go 67 8 easy 1161 maximum level sum of a binary tree 66 2 medium 1162 as far from land as possible 48 5 medium 1163 last substring in lexicographical order 35 1 hard 1164 product price at a given date 68 4 medium 1165 single row keyboard 85 7 easy 1166 design 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