Volume 1
http://acm.hdu.edu.cn/showproblem.php?pid=1005
http://acm.hdu.edu.cn/showproblem.php?pid=1014
http://acm.hdu.edu.cn/showproblem.php?pid=1019
Volume 2
http://acm.hdu.edu.cn/showproblem.php?pid=1104
http://acm.hdu.edu.cn/showproblem.php?pid=1108
http://acm.hdu.edu.cn/showproblem.php?pid=1111
http://acm.hdu.edu.cn/showproblem.php?pid=1121
http://acm.hdu.edu.cn/showproblem.php?pid=1124
http://acm.hdu.edu.cn/showproblem.php?pid=1153
Volume 3
http://acm.hdu.edu.cn/showproblem.php?pid=1211
http://acm.hdu.edu.cn/showproblem.php?pid=1239
http://acm.hdu.edu.cn/showproblem.php?pid=1299
Volume 4
http://acm.hdu.edu.cn/showproblem.php?pid=1333
http://acm.hdu.edu.cn/showproblem.php?pid=1370
http://acm.hdu.edu.cn/showproblem.php?pid=1395
http://acm.hdu.edu.cn/showproblem.php?pid=1397
Volume 5
http://acm.hdu.edu.cn/showproblem.php?pid=1431
http://acm.hdu.edu.cn/showproblem.php?pid=1452
http://acm.hdu.edu.cn/showproblem.php?pid=1492
Volume 6
http://acm.hdu.edu.cn/showproblem.php?pid=1573
http://acm.hdu.edu.cn/showproblem.php?pid=1576
http://acm.hdu.edu.cn/showproblem.php?pid=1581
Volume 7
http://acm.hdu.edu.cn/showproblem.php?pid=1695
Volume 8
http://acm.hdu.edu.cn/showproblem.php?pid=1719
http://acm.hdu.edu.cn/showproblem.php?pid=1787
http://acm.hdu.edu.cn/showproblem.php?pid=1788
http://acm.hdu.edu.cn/showproblem.php?pid=1795
Volume 9
http://acm.hdu.edu.cn/showproblem.php?pid=1852
Volume 10
http://acm.hdu.edu.cn/showproblem.php?pid=1905
http://acm.hdu.edu.cn/showproblem.php?pid=1920
http://acm.hdu.edu.cn/showproblem.php?pid=1923
http://acm.hdu.edu.cn/showproblem.php?pid=1930
http://acm.hdu.edu.cn/showproblem.php?pid=1973
http://acm.hdu.edu.cn/showproblem.php?pid=1979
http://acm.hdu.edu.cn/showproblem.php?pid=1999
Volume 12
http://acm.hdu.edu.cn/showproblem.php?pid=2136
http://acm.hdu.edu.cn/showproblem.php?pid=2138
http://acm.hdu.edu.cn/showproblem.php?pid=2161
http://acm.hdu.edu.cn/showproblem.php?pid=2197
Volume 13
http://acm.hdu.edu.cn/showproblem.php?pid=2239
http://acm.hdu.edu.cn/showproblem.php?pid=2248
Volume 14
http://acm.hdu.edu.cn/showproblem.php?pid=2303
http://acm.hdu.edu.cn/showproblem.php?pid=2351
http://acm.hdu.edu.cn/showproblem.php?pid=2378
Volume 15
http://acm.hdu.edu.cn/showproblem.php?pid=2447
http://acm.hdu.edu.cn/showproblem.php?pid=2466
Volume 16
http://acm.hdu.edu.cn/showproblem.php?pid=2582
http://acm.hdu.edu.cn/showproblem.php?pid=2588
Volume 17
http://acm.hdu.edu.cn/showproblem.php?pid=2608
http://acm.hdu.edu.cn/showproblem.php?pid=2619
http://acm.hdu.edu.cn/showproblem.php?pid=2620
http://acm.hdu.edu.cn/showproblem.php?pid=2650
Volume 18
http://acm.hdu.edu.cn/showproblem.php?pid=2710
Volume 19
http://acm.hdu.edu.cn/showproblem.php?pid=2814
http://acm.hdu.edu.cn/showproblem.php?pid=2815
http://acm.hdu.edu.cn/showproblem.php?pid=2827
http://acm.hdu.edu.cn/showproblem.php?pid=2837
http://acm.hdu.edu.cn/showproblem.php?pid=2841
http://acm.hdu.edu.cn/showproblem.php?pid=2866
http://acm.hdu.edu.cn/showproblem.php?pid=2879
Volume 20
http://acm.hdu.edu.cn/showproblem.php?pid=2973
Volume 21
http://acm.hdu.edu.cn/showproblem.php?pid=3014
http://acm.hdu.edu.cn/showproblem.php?pid=3037
Volume 22
http://acm.hdu.edu.cn/showproblem.php?pid=3187
Volume 23
http://acm.hdu.edu.cn/showproblem.php?pid=3221
http://acm.hdu.edu.cn/showproblem.php?pid=3223
http://acm.hdu.edu.cn/showproblem.php?pid=3240
http://acm.hdu.edu.cn/showproblem.php?pid=3270
http://acm.hdu.edu.cn/showproblem.php?pid=3292
Volume 24
http://acm.hdu.edu.cn/showproblem.php?pid=3304
http://acm.hdu.edu.cn/showproblem.php?pid=3306
http://acm.hdu.edu.cn/showproblem.php?pid=3307
http://acm.hdu.edu.cn/showproblem.php?pid=3334
http://acm.hdu.edu.cn/showproblem.php?pid=3369
------------------------------以下是数论和简单计数--------------------------------------------
NKOJ:
nkoj1045 Humble Numbers
nkoj1053 哥德巴赫猜想
1053: 哥德巴赫猜想
1236: a^b
1430: Fibonacci
1249: 分解素因子
1200: Euclid's Game
1389: Divisors
1214: Relatives
1379: C Looooops
1602: Gossiping
1892: Lucy's Interesting Journey
1878: Crop Triangles
1872: Pseudoprime numbers
1855: And Then There Was One
1856: Prime Gap
1849: Estimate The Workload
POJ: http://acm.pku.edu.cn/JudgeOnline/
1061:青蛙的约会
2891:Strange Way to Express Integers
3361 Gaussian Prime Factors
1006 Biorhythms （中国剩余定理）
3070 Fibonacci
3146 Interesting Yang Hui Triangle
3233 Matrix Power Series
3292 Semi-prime H-numbers
3682 King Arthur's Birthday Celebration
1845 Sumdiv
1142 Smith Numbers
3358 Period of an Infinite Binary Expansion
1604 Just the Facts
1150 The Last Non-zero Digit
3372 Candy Distribution
2480 Longge's problem
3233 Matrix Power Series
1809 Regetni
hdu
2466 Cryptography Reloaded
2447 K-dimension number
1492 The number of divisors(约数) about Humble Numbers
2462 The Luckiest number
TOJ 3027 And Now, a Remainder from Our Sponsor
hoj: http://acm.hust.edu.cn/thx
1208 Operator + and operator ^
1212 Cubic-free numbers I
1213 Prime's Sum Again
1214 Cubic-free numbers II
URAL_1204_Idempotents_数论
08合肥赛区B题
哈工程网络预赛_1004 ACM_数论