Introductory Problems（入门级题目）

6001Weird Algorithm(1068)	6008Two Sets(1092)	6015Creating Strings(1622)
6002Missing Number(1083)	6009Bit Strings(1617)	6016Apple Division(1623)
6003Repetitions(1069)	6010Trailing Zeros(1618)	6017Chessboard and Queens(1624)
6004Increasing Array(1094)	6011Coin Piles(1754)	6018Digit Queries(2431)
6005Permutations(1070)	6012Palindrome Reorder(1755)	6019Grid Paths(1625)
6006Number Spiral(1071)	6013Gray Code(2205)
6007Two Knights(1072)	6014Tower of Hanoi(2165)

Sorting and Searching（排序与搜索）

6020Distinct Numbers(1621)	6032Playlist(1141)	6044Sum of Four Values(1642)
6021Apartments(1084)	6033Towers(1073)	6045Nearest Smaller Values(1645)
6022Ferris Wheel(1090)	6034Traffic Lights(1163)	6046Subarray Sums I(1660)
6023Concert Tickets(1091)	6035Josephus Problem I(2162)	6047Subarray Sums II(1661)
6024Restaurant Customers(1619)	6036Josephus Problem II(2163)	6048Subarray Divisibility(1662)
6025Movie Festival(1629)	6037Nested Ranges Check(2168)	6049Subarray Distinct Values(2428)
6026Sum of Two Values(1640)	6038Nested Ranges Count(2169)	6050Array Division(1085)
6027Maximum Subarray Sum(1643)	6039Room Allocation(1164)	6051Sliding Median(1076)
6028Stick Lengths(1074)	6040Factory Machines(1620)	6052Sliding Cost(1077)
6029Missing Coin Sum(2183)	6041Tasks and Deadlines(1630)	6053Movie Festival II(1632)
6030Collecting Numbers(2216)	6042Reading Books(1631)	6054Maximum Subarray Sum II(1644)
6031Collecting Numbers II(2217)	6043Sum of Three Values(1641)

Dynamic Programming（动规类题目）

6055Dice Combinations(1633)	6062Array Description(1746)	6069Increasing Subsequence(1145)
6056Minimizing Coins(1634)	6063Counting Towers(2413)	6070Projects(1140)
6057Coin Combinations I(1635)	6064Edit Distance(1639)	6071Elevator Rides(1653)
6058Coin Combinations II(1636)	6065Rectangle Cutting(1744)	6072Counting Tilings(2181)
6059Removing Digits(1637)	6066Money Sums(1745)	6073Counting Numbers(2220)
6060Grid Paths(1638)	6067Removal Game(1097)
6061Book Shop(1158)	6068Two Sets II(1093)

Graph Algorithms（图论算法）

6074Counting Rooms(1192)	6086Flight Routes(1196)	6098Planets and Kingdoms(1683)
6075Labyrinth(1193)	6087Round Trip II(1678)	6099Giant Pizza(1684)
6076Building Roads(1666)	6088Course Schedule(1679)	6100Coin Collector(1686)
6077Message Route(1667)	6089Longest Flight Route(1680)	6101Mail Delivery(1691)
6078Building Teams(1668)	6090Game Routes(1681)	6102De Bruijn Sequence(1692)
6079Round Trip(1669)	6091Investigation(1202)	6103Teleporters Path(1693)
6080Monsters(1194)	6092Planets Queries I(1750)	6104Hamiltonian Flights(1690)
6081Shortest Routes I(1671)	6093Planets Queries II(1160)	6105Knight's Tour(1689)
6082Shortest Routes II(1672)	6094Planets Cycles(1751)	6106Download Speed(1694)
6083High Score(1673)	6095Road Reparation(1675)	6107Police Chase(1695)
6084Flight Discount(1195)	6096Road Construction(1676)	6108School Dance(1696)
6085Cycle Finding(1197)	6097Flight Routes Check(1682)	6109Distinct Routes(1711)

Range Queries（范围查询）

6110Static Range Sum Queries(1646)	6117Hotel Queries(1143)	6124Increasing Array Queries(2416)
6111Static Range Minimum Queries(1647)	6118List Removals(1749)	6125Forest Queries II(1739)
6112Dynamic Range Sum Queries(1648)	6119Salary Queries(1144)	6126Range Updates and Sums(1735)
6113Dynamic Range Minimum Queries(1649)	6120Prefix Sum Queries(2166)	6127Polynomial Queries(1736)
6114Range Xor Queries(1650)	6121Pizzeria Queries(2206)	6128Range Queries and Copies(1737)
6115Range Update Queries(1651)	6122Subarray Sum Queries(1190)
6116Forest Queries(1652)	6123Distinct Values Queries(1734)

Tree Algorithms（树）

6129Subordinates(1674)	6135Company Queries II(1688)	6141Distinct Colors(1139)
6130Tree Matching(1130)	6136Distance Queries(1135)	6142Finding a Centroid(2079)
6131Tree Diameter(1131)	6137Counting Paths(1136)	6143Fixed-Length Paths I(2080)
6132Tree Distances I(1132)	6138Subtree Queries(1137)	6144Fixed-Length Paths II(2081)
6133Tree Distances II(1133)	6139Path Queries(1138)
6134Company Queries I(1687)	6140Path Queries II(2134)

Mathematics（数学问题）

6145Josephus Queries(2164)	6156Distributing Apples(1716)	6167Moving Robots(1726)
6146Exponentiation(1095)	6157Christmas Party(1717)	6168Candy Lottery(1727)
6147Exponentiation II(1712)	6158Bracket Sequences I(2064)	6169Inversion Probability(1728)
6148Counting Divisors(1713)	6159Bracket Sequences II(2187)	6170Stick Game(1729)
6149Common Divisors(1081)	6160Counting Necklaces(2209)	6171Nim Game I(1730)
6150Sum of Divisors(1082)	6161Counting Grids(2210)	6172Nim Game II(1098)
6151Divisor Analysis(2182)	6162Fibonacci Numbers(1722)	6173Stair Game(1099)
6152Prime Multiples(2185)	6163Throwing Dice(1096)	6174Grundy's Game(2207)
6153Counting Coprime Pairs(2417)	6164Graph Paths I(1723)	6175Another Game(2208)
6154Binomial Coefficients(1079)	6165Graph Paths II(1724)
6155Creating Strings II(1715)	6166Dice Probability(1725)

String Algorithms（字符串算法）

6176Word Combinations(1731)	6182Required Substring(1112)	6188Repeating Substring(2106)
6177String Matching(1753)	6183Palindrome Queries(2420)	6189String Functions(2107)
6178Finding Borders(1732)	6184Finding Patterns(2102)	6190Substring Order I(2108)
6179Finding Periods(1733)	6185Counting Patterns(2103)	6191Substring Order II(2109)
6180Minimal Rotation(1110)	6186Pattern Positions(2104)	6192Substring Distribution(2110)
6181Longest Palindrome(1111)	6187Distinct Substrings(2105)

Geometry（几何类问题）

6193Point Location Test(2189)	6196Point in Polygon(2192)	6199Convex Hull(2195)
6194Line Segment Intersection(2190)	6197Polygon Lattice Points(2193)
6195Polygon Area(2191)	6198Minimum Euclidean Distance(2194)

Advanced Techniques（进阶算法）

6200Meet in the Middle(1628)	6208Necessary Roads(2076)	6216Apples and Bananas(2111)
6201Hamming Distance(2136)	6209Necessary Cities(2077)	6217One Bit Positions(2112)
6202Beautiful Subgrids(2137)	6210Eulerian Subgraphs(2078)	6218Signal Processing(2113)
6203Reachable Nodes(2138)	6211Monster Game I(2084)	6219New Roads Queries(2101)
6204Reachability Queries(2143)	6212Monster Game II(2085)	6220Dynamic Connectivity(2133)
6205Cut and Paste(2072)	6213Subarray Squares(2086)	6221Parcel Delivery(2121)
6206Substring Reversals(2073)	6214Houses and Schools(2087)	6222Task Assignment(2129)
6207Reversals and Sums(2074)	6215Knuth Division(2088)	6223Distinct Routes II(2130)

Additional Problems（杂类问题）

6224Shortest Subsequence(1087)	6250Xor Pyramid(2419)	6276Empty String(1080)
6225Counting Bits(1146)	6251Writing Numbers(1086)	6277Grid Paths(1078)
6226Swap Game(1670)	6252String Transform(1113)	6278Bit Substrings(2115)
6227Prüfer Code(1134)	6253Letter Pair Move Game(2427)	6279Reversal Sorting(2075)
6228Acyclic Graph Edges(1756)	6254Maximum Building I(1147)	6280Counting Reorders(2421)
6229Strongly Connected Edges(2177)	6255Sorting Methods(1162)	6281Book Shop II(1159)
6230Even Outdegree Edges(2179)	6256Cyclic Array(1191)	6282Network Breakdown(1677)
6231Multiplication Table(2422)	6257List of Sums(2414)	6283Visiting Cities(1203)
6232Advertisement(1142)	6258Increasing Array II(2132)	6284Missing Coin Sum Queries(2184)
6233Special Substrings(2186)	6259Food Division(1189)	6285Number Grid(1157)
6234Permutation Inversions(2229)	6260Bit Problem(1654)	6286Maximum Building II(1148)
6235Maximum Xor Subarray(1655)	6261Swap Round Sorting(1698)	6287Filling Trominos(2423)
6236Movie Festival Queries(1664)	6262Binary Subsequences(2430)	6288Stick Divisions(1161)
6237Chess Tournament(1697)	6263Tree Isomorphism I(1700)	6289Coding Company(1665)
6238Tree Traversals(1702)	6264Counting Sequences(2228)	6290Flight Route Requests(1699)
6239Network Renovation(1704)	6265Critical Cities(1703)	6291Two Stacks Sorting(2402)
6240Graph Girth(1707)	6266School Excursion(1706)	6292Tree Isomorphism II(1701)
6241Intersection Points(1740)	6267Coin Grid(1709)	6293Forbidden Cities(1705)
6242Inverse Inversions(2214)	6268Robot Path(1742)	6294Area of Rectangles(1741)
6243Monotone Subsequences(2215)	6269Programmers and Artists(2426)	6295Grid Completion(2429)
6244String Reorder(1743)	6270Course Schedule II(1757)	6296Creating Offices(1752)
6245Stack Weights(2425)	6271Removing Digits II(2174)	6297Permutations II(1075)
6246Pyramid Array(1747)	6272Coin Arrangement(2180)	6298Functional Graph Distribution(2415)
6247Increasing Subsequence II(1748)	6273Counting Bishops(2176)	6299New Flight Routes(1685)
6248String Removals(1149)	6274Grid Puzzle I(2432)	6300Grid Path Construction(2418)
6249Bit Inversions(1188)	6275Grid Puzzle II(2131)