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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
12471 DIE HARD   157 7986 38.69
12
13
8670 THE MAX LINES   29 8046 36.87
4
10
78 Marbles   68 8231 34.99
15
13
39 Piggy-Bank   140 8249 35.53
14
16
1028 Hubulullu   61 8257 58.72
2
15
2178 He is offside!   5 8447 50.13
3
4
740 Treats for the Cows   261 8632 42.74
13
14
11515 I AM VERY BUSY   153 8647 45.05
9
11
12323 Minimum Knight moves !!!   133 8721 42.65
15
11
1805 Largest Rectangle in a Histogram   229 8761 28.42
18
23
97 Party Schedule   251 8959 36.24
14
16
27 Sorting Bank Accounts   53 8979 40.34
11
6
4560 The Double HeLiX   147 8980 37.55
11
10
328 Bishops   83 8988 32.04
14
7
31 Fast Multiplication   49 9044 20.71
15
12
9861 Hotels Along the Croatian Coast   211 9065 41.78
10
12
7406 Beehive Numbers   38 9215 58.91
5
9
345 Mixtures   256 9222 36.24
17
21
7733 Happy Numbers I   89 9403 53.36
8
8
5449 Seinfeld   189 9560 40.07
8
11
10582 subarrays   215 9569 34.36
11
13
206 Bitmap   247 9660 28.29
15
16
7742 Onotole needs your help   138 10152 41.10
4
11
1841 Prime Path   338 10594 57.99
19
18
1021 Aibohphobia   310 10728 36.22
12
17
8002 Horrible Queries   399 11161 29.81
19
18
32 A Needle in the Haystack   193 11379 38.37
15
14
4141 Euler Totient Function   147 12041 39.03
8
11
1419 A Game with Numbers   118 12077 61.48
3
10
1716 Can you answer these queries III   236 12144 43.83
22
21
14930 Princess Farida   274 12258 26.80
7
10
4408 Build a Fence   38 12327 44.81
4
5
7424 Girls and Boys   91 12347 46.95
4
10
379 Ambiguous Permutations   71 12377 59.61
4
5
3923 Philosophers Stone   310 12869 43.54
10
11
2157 Anti-Blot System   104 12967 45.24
10
5
11063 AP - Complete The Series (Easy)   48 13032 37.13
3
6
302 Count on Cantor   155 13081 61.26
13
14
1724 Counting Triangles   69 13198 33.99
7
21
6219 Edit distance   306 13254 33.14
12
18
10509 Cards   78 13539 34.03
4
4
3375 Stamps   29 13789 41.72
5
3
3267 D-query   461 13990 28.60
19
23
1043 Can you answer these queries I   569 14330 19.05
25
24
2727 Army Strength   40 14567 41.23
4
4
3377 A Bug’s Life   343 15927 27.72
12
13
11814 Eko   172 16737 26.94
14
14
902 Hangover   57 17908 62.79
3
3
9948 Will it ever stop   121 17946 43.01
4
9
6256 Inversion Count   534 18101 32.03
16
18

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