首先推荐一个各大ACM网站的一键直达网站。
链接地址：https://vjudge.net
杭电OJ刷题顺序推荐
第一阶段：开始入门！（15天，53题）
一．输入输出练习（2天，10题） 1000、1089—1096、1001 二．简单操作（2—4天，12题） 2000—2011、2039 三．英文题试水（3—4天，8题） 1720、1062、2104、1064、2734、1170、1197、2629 四．回归水题（4-6天，24题） 2012—2030、2032、2040、2042、2054、2055
第二阶段：我要学算法！（12天，31题）
一．学会处理字符串（2天，6题） 2072、2081、2093、2091、1004、2057 二．简单数学题（4天，12题） 2031、2033、2070、2071、2075、2089、2090、2092、2096—2099 三．要玩就玩汉诺塔（2天,5题） 1995、1996、2064、2077、2175 四．As easy as math（4天，8题） 1108、2138、1713、1722、2136、2504、1717、1125
第三阶段：acm无底洞！（10天，18题）
一．初见dp（2—4天，4题） 2062、1087、1203、1003 二．迷宫之烟雾缭绕（2—4天，3题） 1728、1010、1072 三．数学题做不下去了（3-5天，8题） 1052、1568、1443、1222、1249、1005、2674、1018 四．龙门客栈，暗藏玄机（2—3天，3题） 1022、1237、1082
POJ刷题顺序推荐
POJ上的一些水题(可用来练手和增加自信) (poj1003,poj1004,poj1005,poj1207,poj3299,poj2159,poj2739,poj1083,poj2262,poj3006,poj2255,poj3094) 初级:
一.基本算法: (1)枚举. (poj1018,poj1753,poj2965) (2)贪心(poj1328,poj2109,poj2586) (3)递归和分治法. (4)递推. (5)构造法.(poj3295,poj3239) (6.1)模拟法.(poj1008,poj1068,poj2632,poj1573,poj2993,poj2996,poj3087)
(6.2)模拟法（高精度算法）（poj1001,poj1503,poj2389,poj2602,poj3982,21位大数的水仙花数） 二.图算法: (1)图的深度优先遍历和广度优先遍历. (2)最短路径算法(dijkstra,bellman-ford,floyd,heap+dijkstra) (poj1860,poj3259,poj1062,poj2253,poj1125,poj2240) (3)最小生成树算法(prim,kruskal) (poj1789,poj2485,poj1258,poj3026) (4)拓扑排序 (poj1094) (5)二分图的最大匹配 (匈牙利算法) (poj3041,poj3020) (6)最大流的增广路算法(压入重标法，KM算法). (poj1459,poj3436) 三.数据结构. (1)串 (poj1016,poj1035,poj3080,poj1936) (2)排序(快排、归并排(与逆序数有关)、堆排) (poj1007,poj2388,poj1804,poj2299) (3)简单并查集的应用. (4)哈希表和二分查找等高效查找法(数的Hash,串的Hash) (poj1002,poj3349,poj3274,poj1840,poj2002,poj3432,poj2503) (5)优先队列(poj3253) (6)堆 (7)trie树(静态建树、动态建树) (poj2513) 四.简单搜索 (1)深度优先搜索 (poj2488,poj3083,poj3009,poj1321) (2)广度优先搜索(poj3278,poj1426,poj3126,poj3414,poj2251) (3)简单搜索技巧和剪枝(poj1010,poj2362,poj1011,poj1416,poj2676,poj1129) 五.动态规划 (1)背包问题. (poj1837,poj1276,poj1014) (2)型如下表的简单DP(可参考lrj的书 page149):
1.E[j]=opt{D+w(i,j)} (poj3267,poj1836,poj1260,poj2533) 2.E[i,j]=opt{D[i-1,j]+xi,D[i,j-1]+yj,D[i-1][j-1]+zij} (最长公共子序列) (poj1015,poj3176,poj1163,poj1080,poj1159) 3.C[i,j]=w[i,j]+opt{C[i,k-1]+C[k,j]}.(最优二分检索树问题) 六.数学 (1)组合数学: 1.加法原理和乘法原理. 2.排列组合. 3.递推关系. (poj1012,poj3252,poj1850,poj1496,poj1019,poj1942) (2)数论. 1.素数与整除问题 2.进制位. 3.同余模运算. (poj2305,poj2635,poj3292,poj1845,poj2115)
4.逻辑推理.
（poj1013,poj1017）
4.中国余数定理(poj1006) (3)计算方法. 1.二分法求解单调函数相关知识.(poj3273,poj3258,poj1905,poj3122)
(4)随机化算法(poj2531)
(5)概率(poj2151) 七.计算几何学. (1)几何公式. (2)叉积和点积的运用(如线段相交的判定,点到线段的距离等). (poj2031,poj1039) (3)多边型的简单算法(求面积)和相关判定(点在多边型内,多边型是否相交) (poj1408,poj1584) (4)凸包. (poj1696,poj2187,poj1113)
中级:
一.基本算法: (1)C++的标准模版库的应用. (poj3096,poj3007) (2)较为复杂的模拟题的训练(poj3393,poj1472,poj3371,poj1027,poj2706,poj1009) 二.图算法: (1)差分约束系统的建立和求解. (poj1716,poj1201,poj2983) (2)最小费用最大流(poj2516,poj2195) (3)双连通分量(poj2942) (4)强连通分支及其缩点.(poj2186) (5)图的割边和割点(poj1523,poj3352,poj3177) (6)最小割模型、网络流规约(poj3308 ) 三.数据结构. (1)线段树. (poj2528,poj2828,poj2777,poj2886,poj2750) (2)静态二叉检索树. (poj2482,poj2352) (3)树状树组(poj1195,poj3321) (4)RMQ. (poj3264,poj3368) (5)并查集的高级应用. (poj1703,2492) (6)KMP算法. (poj1961,poj2406) 四.搜索 (1)最优化剪枝和可行性剪枝 (2)搜索的技巧和优化 (poj1020,poj3411,poj1724) (3)记忆化搜索(poj3373,poj1691)
(4)搜索与状态压缩(poj1184)
五.动态规划 (1)较为复杂的动态规划(如动态规划解特别的施行商问题等) (poj1191,poj1054,poj3280,poj2029,poj2948,poj1925,poj3034) (2)记录状态的动态规划. (POJ3254,poj2411,poj1185) (3)树型动态规划(poj2057,poj1947,poj2486,poj3140) 六.数学 (1)组合数学: 1.容斥原理. 2.抽屉原理. 3.置换群与Polya定理(poj1286,poj2409,poj3270,poj1026). 4.递推关系和母函数.
(2)数学. 1.高斯消元法(poj2947,poj1487, poj2065,poj1166,poj1222) 2.概率问题. (poj3071,poj3440) 3.GCD、扩展的欧几里德(中国剩余定理) (poj3101) (3)计算方法. 1.0/1分数规划. (poj2976) 2.三分法求解单峰(单谷)的极值. 3.矩阵法(poj3150,poj3422,poj3070) 4.迭代逼近(poj3301) (4)随机化算法(poj3318,poj2454) (5)杂题. (poj1870,poj3296,poj3286,poj1095) 七.计算几何学. (1)坐标离散化. (2)扫描线算法(例如求矩形的面积和周长并,常和线段树或堆一起使用). (poj1765,poj1177,poj1151,poj3277,poj2280,poj3004) (3)多边形的内核(半平面交)(poj3130,poj3335) (4)几何工具的综合应用.(poj1819,poj1066,poj2043,poj3227,poj2165,poj3429)
杭电、POJ、ZOJ ACM题目分类详解
1、递归与分治（27）
（1）汉诺塔类问题（7）
ZOJ（3）：
1239-Hanoi Tower Troubles Again! 2338-The Towers of Hanoi Revisited 2954-Hanoi Tower POJ（4）： 1920-Towers of Hanoi 3572-Hanoi Towers 3601-Tower of Hanoi 1958-Strange Towers of Hanoi
（2）Fibonacci数列类问题（20）
ZOJ（3）：
1828-Fibonacci Numbers 2060-Fibonacci Again 2672-Fibonacci Subsequence HUD（17）： 1021-Fibonacci Again 1250-Hat’s Fibonacci 1316-How Many Fibs? 1329-Hanoi Tower Troubles Again! 1568-Fibonacci 1588-Gauss Fibonacci 1708-Fibonacci String 1848-Fibonacci again and again2018一母牛的故事 2070-Fibbonacci Number 2814-Interesting Fibonacci 2855-Filbonacci Check-up 3054-Fibonacci 3117-Fibonacci Numbers 3306-Another kind of Fibonacci 3509-Buge’s Fibonacci Number Problem 4099-Revenge of Fibonacci 4786-Fibonacci Tree 2、动态规划类问题（189题） ZOJ： 1022—Parallel Expectations 1025-Wooden Sticks 1094-Matrix Chain Multiplication 1136-Multiple 1200-Mining 1245-Triangles 1249-Pushing Boxes 1250-Always On the Run 1276-Optimal Array Multiplication Sequence 1303-Jury Compromise 1346-Comparing Your Heroes 1353-Unimodal Palindromic Decompositions 1366-Cash Machine 1368-BOAT 1387-Decoding Morse Sequences 1424-Painting A Board 1425-Crossed Matchings 1428-Magazine Delivery 1446-Hyper- Prime Expression 1449-Maximum Sum 1454-Employment Planning 1459-String Distance and Transform Process 1462-Team Them Up! 1403-Brackets Sequenee 1470-lHow Many Trees? 1474-Counter Strike 1475-Ranklist 1483-Robots 1484-Minimum Inversion Number 1490-Satellite Antenna 1499-Increasing Sequences 1503-One Person “The Price is Right” 1512-Water Treatment Plants 1515-Square Lottery 1520-Duty Free Shop 1521-Not Too Convex Hull 1524-Supermarket 1539-Lot 1540-Censored! 1551-Cricket Field 1554-Folding 1563-Pearls 1571-Hexagon Mystery 1579-Bridge 1602-Multiplication Puzzle 1607-Varacious Steve 1611-Traveling in Solar System 1629-Counting Triangles 1638-Greedy Island 1642-Match for Bonus 1651-Parts Process 1666-Square Coins 1695-True Liars 1713-Haiku Review 1717-The Secret Number 1731-Supermarket 1733-Common Subsequence 1736-Binary Polynomials 1738-Lagrange’s Four Square Theorem 1743-Concert Hall Scheduling 1756-Robots 1757-Bright Bracelet 1787-Tiling Up Blocks 1792-Gap Punishment Aligment Problem 1800-Decorations 1819-Rhyme Schemes 1853-The Brick Stops Here 1864-Old Wine Into New Bottles 1877-Bridge 1880-Tug of War 1893-A Multiplication Game 1913-Euclid’s Game 1918-Ferry Loading Ⅱ 1925-Dumb Bones 1953-Advanced Fruits 1983-Fold 1985-Largest Rectangle in a Histogram 1986-Bridging Signals 1988-Gladiators 1991-Prison Rearrangement 1995-Spiderman 2002-Copying Books 2014-Piggy-Bank 2025-I-Keyboard 1667-Restaurant 2058-The Archaeologist’s Troutble 前 2059-The Twin Towers 2067-White Rectangles 2068-Chopsticks 2069-Greatest L-east Common Maltiple 2081-Mission Impossible 2089-Learn to Write 2096-Door to Secret 2115-Dangerous Pattern 2118-Christopher’s Rainy Day 2127-Zuma 2136-Longest Ordered Subsequence 2142-Light The Square 2144-Sending Gift 2156-Charlie’s Change 2180-City Game 2189—Exact Change Only 2202-Alphacode 2206-Roll Playing Games 2180-City Game 2189-Exact Change Only 2202-Alphacode 2206-Roll Playing Games 2213-Fun Game 2224-Square 2227-Minimax Triangulation 2242-Huffman’s Greed 2244-Land Division Tax 2254-Island Country 2255-Best Editor 2264-Confusing Login Names 2271-Chance to Encounter a Girl 2278-Fight for Food 2280-Key to Freedom 2281-Way to Freedom 2283-Challenge of Wisdom 2284-Inversion Number 2297-Survival 2319-Beautiful People 2337-Non Absorbing DFA 2338-The Towers of Hanoi Revisited 2341-Quantization Problem 2349-Mix and Build 2353-Special Experiment 2354-Elevator Stopping Plan 2042-Divisibility 2422-Terrible Sets 2424-Game of Connections 2444-Bundling 2498-Software Company 2501-A Mini Locomotive 2521-LED Display 2522-Fellowship Activity 2527-Series 2536-Best Balance 2547-Tri Tiling 2561-Order-Preserving Codes 2563-Long Dominoes 2565-Cracking SSH 2568-Counting Triangulations 2581-Tour 2591-DVD 2598-Yet Another Digit 2604-Little Brackets 2621-Instructions 2624-Popo’s Lamps 2625-Rearrange Them 2626-Polygon Game 2641-Exploring Pyramids 2642-Feel Good 2667-Joke with Turtles 2673-Hexagon and Rhombic Dominoes 2683-Marathon 2685-UNISON 2692-Dialing Dice 2702-Unrhymable Rhymes 2710-Two Pipelines 2711-Regular Words 2734-Exchange Cards 2739-Color Quantization 2744-Palindromes 2745-01-K Code 2758-Subtitle 2771-Get Out of the Glass 2780-Margaritas on the River Walk 2800-Any Fool Can Do It 2802-Help the Problem Setter 2366-Weird Dissimilarity 2372-Work Reduction 2374-Marbles on a tree 2397-Tian Ji-The Horse Racing 2398-Islands and Bridges 2401-Zipper 2402-Lenny’s Lucky Lotto Lists 2414-Index of Prime 2822-Sum of Diferent Primes 2845-The Best Travel Design 2852-Deck of Cards 2860-Breaking Strings 2869-Halls 2872-Binary Partitions 2882-Nested Dolls 2884-Moogle 2889-Vacation Rentals
3、贪心算法类问题（79）
ZOJ：（35）
1117-Entropy 1161-Gone Fishing 1200-Mining 1230-Hanoi Tower Troubles Again! 1307-Packets 1360-Radar Installation 1375-Pass-Muraille 1409-Communication System 1543-Stripies 2049-Advertisement 2091-Mean of Subsequence 2229-Ride to School 2256-Mincost 2315-New Year Bonus Grant 2343-Robbers 2354-Elevator Stopping Plan 2378-Evil Straw Warts Live 2397-Tian Ji-The Horse Racing 2425-Inversion 2488-Rotten Ropes 2510-Concentric Rings 2521-LED Display 2536-Best Balance 2541-Goods Transportation 2702-Unrhymable Rhymes 2710-Two Pipelines 2833-Friendship 2921-Stock 3116-Loan Scheduling 3197-Google Book 3301-Make Pair 3410-Layton’s Escape 3424-Rescue 3433-Gu Jian Qi Tan 3508-The War
POJ：（44）
1017-Packets 1042-Gone Fishing 1062一昂贵的聘礼 1065-Wooden Sticks 1125-Stockbroker Grapevine 1230-Pass-Muraille 1258-Agri-Net 1323-Game Prediction 1328-Radar Installation 1456-Supermarket 1679-The Unique MST 1716-Integer Intervals 1755-Triathlon 1784-Huffman’s Greed 1789-Truck History 1797-Heavy Transportation 1860-Currency Exchange 1861-Network 1862-Stripies 1922-Ride to School 2054-Color a Tree 2209-The King 2240-Arbitrage 2253-Frogger 2287-Tian Ji-The Horse Racing 2313-Sequence 2325-Persistent Numbers 2370-Democracy in danger 2393-Yogurt factory 2395-Out of Hay 2431-Expedition 2485-Highways 2709-Painter 3026-Borg Maze 3228-Gold Transportation 3253-Fence Repair 3259-Wormholes 3262-Protecting the Flowers 3522-Slim Span 3544-Journey with Pigs 3614-Sunscreen 3617-Best Cow Line 3625-Building Roads 3723-Conseription
4、回溯算法（36）
ZOJ：（15）
1002-Fire Net 1004-Anagrams by Stack 1084-Channel Allocation 1107-FatMouse and Cheese 1204-Additive Equations 1331-Perfect Cubes 1457-Prime Ring Problem 1711-Sum It Up(POJ1564) 1909-Square(POJ2362) 2103-Marco Popo the Traveler 2418-Matrix(POJ2078) 2580-Sudoku 3316-Game 3378-Attack the NEET Princess 3516-Tree of Three
POJ：（21）
1010-Stamps 1011-Sticks 1020-Anniversary Cake 1062一昂贵的聘礼 1085-Triangle War 1129-ChannelAllocation 1166-The Clocks 1167-The Buses 1190一生日蛋糕 1256-Anagram 1315-Don’t Get Rooked 1321一棋盘问题 1416-Shredding Company 1699-Best Sequence 1753-Flip Game 1979-Red and Black 1980-Unit Fraction Partition 2400-Supervisor,Supervisee 2488-A Knight’s Journey 2676-Sudoku 2677-Tour
5、图的搜索（98）
ZOJ：（98）
1144-Robbery 1155-Triangle War 1229-Gift?！ 1249-Pushing Boxes 1297-Hexagon 1301-The New Villa 1344-A Mazing Problem 1355-Dehuff 1361-Holedox Moving 1671-Walking Ant 1675-Push!！ 1686-Young,Poor and Busy 1709-Oil Deposits 1711-Sum It Up 1719-Square Carpets 1742-Gap 1832-File Fragmentation 1909-Square 1411-Anniversary 1412-Tester Program 1415-Puzzlestan 1435-Deeper Blue 1443-E-Puzzle Is Fun 1457-Prime Ring Problem 1479-Dweep 1505-Solitaire 1518-This Sentence is False 1530-Find The Multiple 1572-Bracelet 1593-Fool Game 1649-Rescue 2233-Pollution 2241-Fractran 2252-Fly Flies 2276-Lara Croft 2288-Across the River 2355-New Go Game 2372-Work Reduction 2374-Marbles on a Tree 2412-Farm Irrigation 2416-Open the Lock 2418-Matrix 2437-Nearest Number 2440-One is Good,but Two is Bet 2442-Simple Prefix Compression 2466-Farmer Bill’s Problem 2471-Sea Battle 2475-Benny’s Compiler 2477-Magic Cube 2509-Box Pushing 2515-Height of Water Tower 2531-Traveller 2534-Time Machine 2580-Sudoku 2588-Burning Bridges 2594-Driving Straight 2631-Chemfrog’s Fairy Tale 2633-Full of Painting Ⅱ 1935-XYZZY 1940-Dungeon Master 1977-Hall of Fountains 1984-Genetic Code 2031-Song List 2033-The Jewelry Is Gone 2043-Loan 2053-Domino Puzzle 2093-Volcano 2103-Marco Popo the Traveler 2110-Tempter of the Bone 2128-Seven Seas 2165-Red and Black 2688-Requirements 2749-Polarium 2765-Rotate and Connect 2787-Children of the Candy Corn 2799-European railroad tracks 2821-Cubic Eight-Puzzle 2823-Manhattan Wiring 2825-Polygons on the Grid 2859-Matrix Searching 2868-Incredible Cows 2879-Copying DNA 2880-Circle of Debt 2891-Team Work 2898-Greedy Grave Robber 2911-Hypertheseus 2922-Bombs 2925-DomiNo Grid 2936-Electronic Document Security 2938-Rock Skipping 2951-Eccentric Warehouses 2977-Strange Billboard 3010-The Lamp Game 3059-Die Board Game 3094-Escape from Enemy Territory 3110-Geophysics Prospection 3158-Cut The Cake 3196-Give me the Result
6、图论（85）
ZOJ：（43） 1023-University Entrace Examination 1059-What’s In a Name 1077-Genetic Combinations 1157-A Plug for UNIX 1197-Sorting Slides 1231-Mysterious Mountain 2332-Gems 2333-MatScan 2362-Beloved Sons 2399-Jamie’s Contact Groups 2521-LED Display 2532-Internship 1364-Machine Schedule 1516-Uncle Tom’s Inherited Land 1525-Air Raid 1576-Marriage is Stable 1626-Save These Poor Trees 1654-Place the Robots 1734-Power Network 1760-Doubles 1882-Gopher Ⅱ 1992-Sightseeing Tour 1994-Budget 2067-White Rectangles 2192-T-Shirt Gumbo 2221-Taxi Cab Scheme 2223-Card Game Cheater 2314-Reactor Cooling 2567-Trade 2587-Unique Attack 2616-Duopoly 2760-How Many Shortest Path 2788-Panic Room 3037-Ladies’Choice 3111-Domino Art 3120-The Stable Marriage Problem 3156-Taxi 3229-Shoot the Bullet 3305-Get Sauce 3348-Schedule 3460-Misile 3496-Assignment 3615-Choir Ⅱ
POJ：（42）
1087-A Plug for UNIX 1149-PIGS 1273-Synchronous Design 1325-Machine Schedule 1422-Air Raid 1459-Power Network 1486-Sorting Slides 1637-Sightseeing Tour 1698-Alice’s Chance 1719-Shooting Contest 1815-Friendship 1904-King’s Quest 1955-Rubik’s Cube 2060-Taxi Cab Scheme 2112-Optimal Milking 2135-Farm Tour 2175-Evacuation Plan 2226-Muddy Fields 2239-Selecting Courses 2289-Jamie’s Contact Groups 2391-Ombrophobic Bovines 2400-Supervisor,Supervisee 2407-Relatives 2446-Chessboard 2455-Secret Milking Machine 2516-Minimum Cost 2536-Gopher Ⅱ 2594-Treasure Exploration 3020-Antenna Placement 3041-Asteroids 3155-Hard Life 3216-Repairing Company 3281-Dining 3308-Paratroopers 3342-Party at Hali-Bula 3422-Kaka’s Matrix Travels 3436-ACM Computer Factory 3469-Dual Core CPU 3498-March of the Penguins 3565-Ants 3680-Intervals 3692-Kindergarten
7、数论（117）
ZOJ：（44） 1095-Humble Numbers 1133-Smith Numbers 1136-Multiple 1143-Date Bugs 1222-Just the Facts 1278-Pseudo-Random Numbers 1284-Perfection 1312-Prime Cuts 1889-Ones 1951-Goldbach’s Conjecture 2022-Factorial 2095-Divisor Summation 2286-Sum of Divisors 2305-C Looooops 2313-Chinese Girls’Amusement 2421-Recaman’s Sequence 1314-Uniform Generator 1385-Binary Stirling Numbers 1408-The Fun Number System 1489-2*mod n=1 1526-Big Number 1530-Find The Multiple 1569-Partial Sums 1577-GCD &LCM 1596-Hamming Problem 1657-Goldbach’s Conjecture 1712-Skew Binary 1797-Least Common Multiple 1842-Prime Distance 1850-Factovisors 2520-Amicable Pairs 2545-Factstone Benchmark 2674-Strange Limit 2723-Semi-Prime 2806-The Embarrassed Cryptographer 2945-Remainder from Our Sponsor 2964-Triangle 3008-Gold Coins 3014一9875321 3024-Monday-Saturday Prime Factors 3175-Number of Containers 3254-Secret Code 3621-Factorial Problem in Base K 3687-The Review Plan I
POJ：（30）
1006-Biorhythms 1061一青蛙的约会 1150-The Last Non-zero Digit 1152-An Easy Problem! 1183一反正切函数的应用 1284-Primitive Roots 1365-Prime Land 1528-Perfection 1595-Prime Cuts 1730-Perfect Pth Powers 1845-Sumdiv 1953-World Cup Noise 2034-Anti-prime Sequences 2142-The Balance 2191-Mersenne Composite Numbers 2262-Goldbach’s Conjecture 2407-Relatives 2478-Farey Sequence 2635-The Embarrassed Cryptographer 2689-Prime Distance 2739-Sum of Consecutive Prime Numbers 2773-Happy 2006 2992-Divisors 3101-Astronomy 3126-Prime Path 3210-Coins 3292-Semi-prime H-numbers 3358-Period of an Infinite Binary Expansion 3518-Prime Gap 3641-Pseudoprime numbers
HDU：（43） 1058-Humble Numbers 1124-Factorial 1163-Eddy’s digital Roots 2554-N对数的排列问题 2582-f(n) 2588-GCD 1214一圆桌会议 1262一寻找素数对 1286一找新朋友 1319-Prime Cuts 1370-Biorhythms 1395-2*mod n=1 1420-Prepared for New Acmer 1492-The number of divisors about Humble Numbers 1568-Fibonacci 1573-X问题 1576-A/B 1695-GCD 1716一排列2 1788-Chinese Remainder Theorem Again 2048-Lowest Common Multiple Plus 1830-Remainder from Our Sponsor 2136-Largest prime factor 2142-Disney 2161-Primes 2608-0or 1 2669-Romantic 2674-NIAgain 2824-The Euler Function 2964-Prime Bases 3187-HP Problem 3501-Calculation 2 3579-Hello Kiki 3816-To Be NUMBER ONE 4002-Find the Maximum 4143-A Simple Problem 4279-Number 4398-Template Library Management 4335-What is N? 4483-Lattice triangle 4586-Play the Dice 4767-Bell 4910-Problem about GCD
8、组合数学（99）
ZOJ：（23） 1385-Binary Stirling Numbers 1526-Big Number 1577-GCD &LCM 2000-Palindrome Numbers 2060-Fibonacci Again 2061-Buy the Ticket 2098-Picking Balls 2625-Rearrange Them 2757-Sum of Continuous Subsequences 2766-Rotate and Connect 2836-Number Puzzle 2659-Matrix Searching 2955-Interesting Dart Game 2996-(1+x) 3233-Lucky Number 3344-Card Game 3556-How Many Sets I 3638-Fruit Ninja 3647-Gao the Grid 3687-The Review Plan I 3688-The Review Plan Ⅱ 3725-Painting Storages POJ：（26） 1014-Dividing 1026-Cipher 1037-A Decorative Fence 1095-Trees Made to Order 1221-Unimodal Palindromic Decompositions 1306-Combinations 1322-Chocolate 1354-Placement of Keys 1423-Big Number 1430-Binary Stirling Numbers 1496-Word Index 1521-Entropy 1580-String Matching 1664一放苹果 1792-Hexagonal Routes 1942-Paths on a Grid 2282-The Counting Problem 2346-Lucky Tickets 2773-Happy 2006 3046-Ant Counting 3088-Push Botton Lock 3252-Round Numbers 3370-Halloween Treats 3695-Rectangles 3734-Blocks 3904-Sky Code HDU：（50） 1028-Ignatius and the Princess Ⅲ 1085-Holding Bin-Laden Captive! 1171-Big Event in HDU 1205一吃糖果 1220-Cube 1261一字串数 1398-Square Coins 3682-To Be an Dream Architect 3929-Big Coefficients 3944-DP? 4043-FXTZ Ⅱ 4045-Machine Scheduling 4059-The Boss on Mars 4135-Co-prime 1695-GCD 1709-The Balance 1716一排列2 1722-Cake 1796-How Many Integers Can You Find 1799一循环多少次? 1808-Halloween Treats 2049一不容易系列之（4）一考新郎 2062-Subset Sequence 2068-RPG的错排 2085一核反应堆 2152-Fruit 2204-Eddy的爱好 2451-Simple Addition Expression 2461-Rectangles 3240-Counting Binary Trees 3398-String 3501-Calculation 2 4248-A Famous Stone Collector 4254-A Famous Game 4259-Double Dealing 4335-What is N? 4349-Xiao Ming’s Hope 4372-Count the Buildings 4373-Mysterious For 4390-Number Sequence 4407-Sum 4497-GCD and LCM 4532一袱秋系列故事——安排座位 4675-GCD of Sequence 4746-Mophues 4810-Wall Painting 4869-Turn the Pokers 4908-Best Coder Sequence 4909-String 5047-Sawtooth9:、分支限界算法（14） POJ：（14） 1040-Transportation 1041-John’s Trip 1077-Eight(ZOJ1217) 1103-Maze（Z0J1142) 1167-The Buses 1324-Holedox Moving(ZOJ1361) 1475-Pushing Boxes(Z0J1249) 1817-Traffic Jam(Z0J2163) 1935-Journey 2078-Matrix 2908-Quantum 3322-Bloxorz I 3635-Full Tank?(Z0J2881) 3662-Telephone Lines