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bitmasks problems
Problem Name Online Judge Year Contest Difficulty Level
1 Raising Bacteria Categories Codeforces Codeforces Round #320 (Div. 2) [Bayan Thanks-Round] 1
2 Fedor and New Game Categories Codeforces Codeforces Round #267 (Div. 2) 1
3 Preparing Olympiad Categories Codeforces Codeforces Round #306 (Div. 2) 1
4 Chloe and the sequence Categories Codeforces Codeforces Round #384 (Div. 2) 1
5 Assignments Categories SPOJ 1
6 K-based Numbers Categories Timus 1
7 Tavas and SaDDas Categories Codeforces Codeforces Round #299 (Div. 2) 1
8 Dreamoon and WiFi Categories Codeforces Codeforces Round #272 (Div. 2) 1
9 Histogram Categories SPOJ 1
10 LATGACH3 Categories SPOJ 1
11 Bits Categories Codeforces Codeforces Round #276 (Div. 1) & Codeforces Round #276 (Div. 2) 2
12 Lucky Numbers (easy) Categories Codeforces Codeforces Beta Round #77 (Div. 2 Only) 2
13 Candles Categories Live Archive 2011 Asia - Dhaka 2
14 False Mirrors Categories Timus 2
15 Lineup Categories SPOJ 2
16 Pebbles Categories Live Archive 2007 North America - Pacific Northwest & North America - Southern California 2
17 PICK UP DROP ESCAPE Categories SPOJ 3
18 LLPS Categories Codeforces Codeforces Round #127 (Div. 2) 3
19 Fetching Cooking Tools Categories CodeChef 3
20 Kefa and Dishes Categories Codeforces Codeforces Round #321 (Div. 2) 3
21 The Child and Set Categories Codeforces Codeforces Round #250 (Div. 2) 3
22 Sagheer, the Hausmeister Categories Codeforces Codeforces Round #417 (Div. 2) 3
23 Short Program Categories Codeforces Codeforces Round #443 (Div. 1) & Codeforces Round #443 (Div. 2) 3
24 Array Categories Codeforces Codeforces Round #138 (Div. 2) 3
25 Little Girl and Maximum XOR Categories Codeforces Codeforces Round #169 (Div. 2) 3
26 Undoubtedly Lucky Numbers Categories Codeforces Codeforces Round #150 (Div. 2) 4
27 XOR on Segment Categories Codeforces Codeforces Round #149 (Div. 2) 4
28 Little Pony and Harmony Chest Categories Codeforces Codeforces Round #259 (Div. 1) & Codeforces Round #259 (Div. 2) 4
29 Fox And Jumping Categories Codeforces Codeforces Round #290 (Div. 2) & Codeforces Round #290 (Div. 1) 4
30 Three Logos Categories Codeforces Codeforces Round #322 (Div. 2) 4
31 Permutations Categories Codeforces Rockethon 2015 4
32 The Brand New Function Categories Codeforces Codeforces Round #150 (Div. 1) & Codeforces Round #150 (Div. 2) 4
33 Tournament Categories Codeforces Codeforces Beta Round #27 (Codeforces format, Div. 2) 4
34 And Or Categories UVA 4
35 New Year Tree Categories Codeforces Educational Codeforces Round 6 5
36 Square Subsets Categories Codeforces Codeforces Round #448 (Div. 2) 5
37 A Simple Task Categories Codeforces Codeforces Beta Round #11 5
38 PFAST Inc. Categories Codeforces Codeforces Beta Round #86 (Div. 2 Only) 5
39 Bitwise Formula Categories Codeforces Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) 5
40 Mike and Foam Categories Codeforces Codeforces Round #305 (Div. 1) & Codeforces Round #305 (Div. 2) 5
41 Roman and Numbers Categories Codeforces Codeforces Round #235 (Div. 2) 5
42 Borya and Hanabi Categories Codeforces Codeforces Round #253 (Div. 1) & Codeforces Round #253 (Div. 2) 5
43 Compatible Numbers Categories Codeforces Codeforces Round #112 (Div. 2) 5
44 Sausage Maximization Categories Codeforces Codeforces Round #173 (Div. 2) 5
45 Fox and Minimal path Categories Codeforces Codeforces Round #228 (Div. 1) & Codeforces Round #228 (Div. 2) 5
46 Table Categories Codeforces Codeforces Round #144 (Div. 1) & Codeforces Round #144 (Div. 2) 6
47 Unusual Sequences Categories Codeforces Codeforces Round #450 (Div. 2) 6
48 Second price auction Categories Codeforces Rockethon 2015 6
49 Looking for Order Categories Codeforces Codeforces Beta Round #8 6
50 Jzzhu and Numbers Categories Codeforces Codeforces Round #257 (Div. 1) 6
51 Hongcow's Game Categories Codeforces Codeforces Round #385 (Div. 1) & Codeforces Round #385 (Div. 2) 6
52 Permutation Sum Categories Codeforces Codeforces Round #175 (Div. 2) 6
53 Anya and Cubes Categories Codeforces Codeforces Round #297 (Div. 2) 6
54 Devu and Flowers Categories Codeforces Codeforces Round #258 (Div. 2) 6
55 Random Task Categories Codeforces Codeforces Round #247 (Div. 2) 6
56 Practice Categories Codeforces Codeforces Round #145 (Div. 2, ACM-ICPC Rules) & Codeforces Round #145 (Div. 1, ACM-ICPC Rules) 6
57 Fish Categories Codeforces Codeforces Beta Round #16 (Div. 2 Only) 6
58 New Year Letter Categories Codeforces Good Bye 2013 6
59 Vladik and cards Categories Codeforces Codeforces Round #384 (Div. 2) 6
60 Sereja and Table Categories Codeforces Codeforces Round #243 (Div. 1) 6
61 Characteristics of Rectangles Categories Codeforces Codeforces Round #194 (Div. 1) 6
62 Mahmoud and a xor trip Categories Codeforces Codeforces Round #396 (Div. 2) 6
63 Cunning Gena Categories Codeforces RCC 2014 Warmup (Div. 2) & RCC 2014 Warmup (Div. 1) 6
64 Guess the Tree Categories Codeforces Codeforces Round #245 (Div. 1) & Codeforces Round #245 (Div. 2) 7
65 Petya and Spiders Categories Codeforces Codeforces Beta Round #85 (Div. 1 Only) & Codeforces Beta Round #85 (Div. 2 Only) 7
66 Remembering Strings Categories Codeforces Codeforces Round #302 (Div. 1) & Codeforces Round #302 (Div. 2) 7
67 Inna and Binary Logic Categories Codeforces Codeforces Round #234 (Div. 2) 7
68 Captains Mode Categories Codeforces Codeforces Round #222 (Div. 1) & Codeforces Round #222 (Div. 2) 7
69 Fuzzy Search Categories Codeforces Codeforces Round #296 (Div. 1) 7
70 Axis Walking Categories Codeforces Codeforces Round #191 (Div. 2) 7
71 Binary Table Categories Codeforces CROC 2016 - Final Round [Private, For Onsite Finalists Only] 7
72 Snake Categories Codeforces Codeforces Round #139 (Div. 2) 7
73 Hongcow Buys a Deck of Cards Categories Codeforces Codeforces Round #385 (Div. 1) & Codeforces Round #385 (Div. 2) 7
74 Sereja and Sets Categories Codeforces Codeforces Round #215 (Div. 1) 8
75 Dead Ends Categories Codeforces Codeforces Beta Round #49 (Div. 2) 8
76 Sweets Game Categories Codeforces Codeforces Beta Round #59 (Div. 2) 8
77 Memory for Arrays Categories Codeforces Croc Champ 2013 - Finals (online version, Div. 1) 8
78 Yash And Trees Categories Codeforces Manthan, Codefest 16 8
79 Xenia and Dominoes Categories Codeforces Codeforces Round #199 (Div. 2) 8
80 2048 Categories Codeforces Coder-Strike 2014 - Round 2 8
81 The Minimum Number of Variables Categories Codeforces Codeforces Round #171 (Div. 2) 8
82 Traveling Graph Categories Codeforces Codeforces Alpha Round #21 (Codeforces format) 8
83 Bear and Floodlight Categories Codeforces Codeforces Round #226 (Div. 2) 8
84 Game with Strings Categories Codeforces Codeforces Round #275 (Div. 1) & Codeforces Round #275 (Div. 2) 8
85 Bags and Coins Categories Codeforces Codeforces Round #207 (Div. 1) 8
86 Password Categories Codeforces Codeforces Beta Round #71 8
87 Summer Earnings Categories Codeforces Codeforces Round #194 (Div. 1) 8
88 Circling Round Treasures Categories Codeforces Codeforces Round #221 (Div. 1) & Codeforces Round #221 (Div. 2) 9
89 Sandy and Nuts Categories Codeforces Codeforces Round #332 (Div. 2) 9
90 Polycarpus is Looking for Good Substrings Categories Codeforces VK Cup 2012 Finals (unofficial online-version) 9
91 Two Subsequences Categories Codeforces Codeforces Beta Round #72 (Div. 1 Only) 9
92 Quick Tortoise Categories Codeforces Codeforces Round #144 (Div. 1) 9
93 Two Sets Categories Codeforces Codeforces Round #153 (Div. 1) 9
94 Misha and XOR Categories Codeforces Codeforces Round #285 (Div. 1) 9
95 Bitonix' Patrol Categories Codeforces Codeforces Round #134 (Div. 1) 9
96 Dasha and cyclic table Categories Codeforces Codeforces Round #390 (Div. 2) 9
97 Valera and Number Categories Codeforces Codeforces Round #252 (Div. 2) 9
98 Garden Categories Codeforces Codeforces Round #108 (Div. 2) 9
99 Nuclear Fusion Categories Codeforces Codeforces Beta Round #65 (Div. 2) 9
100 Gambling Nim Categories Codeforces CROC 2016 - Final Round [Private, For Onsite Finalists Only] 9
101 Game with Strings Categories Codeforces Codeforces Round #206 (Div. 1) & Codeforces Round #206 (Div. 2) 9
102 Simplified Nonogram Categories Codeforces Codeforces Round #298 (Div. 2) 9
103 Friends Categories Codeforces Bayan 2012-2013 Elimination Round (ACM ICPC Rules, English statements) 9
104 Design Tutorial: Increase the Constraints Categories Codeforces Codeforces Round #270 9
105 Arrangement Categories Codeforces Codeforces Beta Round #83 (Div. 1 Only) & Codeforces Beta Round #83 (Div. 2 Only) 9
106 Brand New Problem Categories Codeforces Codeforces Round #127 (Div. 1) 9
107 Vasily the Bear and Painting Square Categories Codeforces Codeforces Round #195 (Div. 2) 10
108 Robot in Basement Categories Codeforces Yandex.Algorithm 2011 Finals 10
109 Mutation Categories Codeforces All-Ukrainian School Olympiad in Informatics 10
110 Restoring Map Categories Codeforces VK Cup 2015 - Finals, online mirror 10
111 Boolean Function Categories Codeforces Codeforces Round #323 (Div. 1) 10
112 Party Categories Codeforces Bubble Cup 8 - Finals [Online Mirror] 10