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dsu problems
Problem Name Online Judge Contest Difficulty Level
1 Ice Skating Categories Codeforces Codeforces Round #134 (Div. 1) & Codeforces Round #134 (Div. 2) 1
2 Learning Languages Categories Codeforces Codeforces Round #170 (Div. 1) & Codeforces Round #170 (Div. 2) 1
3 Network Connections Categories UVA 1
4 Graph Connectivity Categories UVA 1
5 Misha and Changing Handles Categories Codeforces Codeforces Round #285 (Div. 2) 1
6 Drazil and His Happy Friends Categories Codeforces Codeforces Round #292 (Div. 1) & Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1) & Codeforces Round #292 (Div. 2) 2
7 Anansi's Cobweb Categories Timus 2
8 Timofey and a tree Categories Codeforces Codeforces Round #395 (Div. 1) & Codeforces Round #395 (Div. 2) 2
9 New Year Permutation Categories Codeforces Good Bye 2014 2
10 DZY Loves Chemistry Categories Codeforces Codeforces Round #254 (Div. 2) 2
11 Lost and survived Categories SPOJ 2
12 Forests Categories UVA 2
13 Knight Tournament Categories Codeforces Codeforces Round #207 (Div. 1) & Codeforces Round #207 (Div. 2) 2
14 Mr. Kitayuta's Colorful Graph Categories Codeforces Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) & Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) 2
15 FRIEND CIRCLE Categories SPOJ 2
16 The Suspects Categories UVA 2
17 War Categories UVA 2
18 Mr. Kitayuta's Colorful Graph Categories Codeforces Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) & Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) 2
19 Strange Food Chain Categories SPOJ 2
20 A + B Strikes Back Categories Codeforces April Fools Day Contest 2014 3
21 Queue Categories Codeforces Codeforces Round #279 (Div. 2) 3
22 Arpa's weak amphitheater and Mehrdad's valuable Hoses Categories Codeforces Codeforces Round #383 (Div. 1) & Codeforces Round #383 (Div. 2) 3
23 Mike and Feet Categories Codeforces Codeforces Round #305 (Div. 1) & Codeforces Round #305 (Div. 2) 3
24 Cthulhu Categories Codeforces Codeforces Beta Round #80 (Div. 1 Only) & Codeforces Beta Round #80 (Div. 2 Only) 3
25 Social Network Community Categories SPOJ 3
26 New Reform Categories Codeforces Codeforces Round #346 (Div. 2) 3
27 Dorm Water Supply Categories Codeforces Codeforces Beta Round #83 (Div. 1 Only) & Codeforces Beta Round #83 (Div. 2 Only) 4
28 Vessels Categories Codeforces Codeforces Round #218 (Div. 2) 4
29 Two Sets Categories Codeforces Codeforces Round #268 (Div. 1) & Codeforces Round #268 (Div. 2) 4
30 Lomsat gelral Categories Codeforces Educational Codeforces Round 2 4
31 Serial Time! Categories Codeforces Codeforces Beta Round #56 4
32 The Child and Zoo Categories Codeforces Codeforces Round #250 (Div. 2) & Codeforces Round #250 (Div. 1) 4
33 Civilization Categories Codeforces Codeforces Round #260 (Div. 1) & Codeforces Round #260 (Div. 2) 4
34 Roads not only in Berland Categories Codeforces Codeforces Beta Round #25 (Div. 2 Only) 4
35 Design Tutorial: Inverse the Problem Categories Codeforces Codeforces Round #270 4
36 Lucky Tree Categories Codeforces Codeforces Beta Round #84 (Div. 1 Only) & Codeforces Beta Round #84 (Div. 2 Only) 5
37 Mahmoud and a Dictionary Categories Codeforces Codeforces Round #396 (Div. 2) 5
38 Dungeons and Candies Categories Codeforces Zepto Code Rush 2014 5
39 Clear Symmetry Categories Codeforces Codeforces Round #127 (Div. 1) & Codeforces Round #127 (Div. 2) 5
40 Connected Components Categories Codeforces Croc Champ 2013 - Round 1 5
41 Dima and Bacteria Categories Codeforces Codeforces Round #234 (Div. 2) 5
42 Exposition Categories Codeforces Codeforces Beta Round #6 (Div. 2 Only) 5
43 Hierarchy Categories Codeforces Codeforces Beta Round #17 5
44 Minimum spanning tree for each edge Categories Codeforces Educational Codeforces Round 3 5
45 Moodular Arithmetic Categories Codeforces Codeforces Round #334 (Div. 1) & Codeforces Round #334 (Div. 2) 5
46 pSort Categories Codeforces Codeforces Beta Round #28 (Codeforces format) 5
47 Weird journey Categories Codeforces Codeforces Round #407 (Div. 1) & Codeforces Round #407 (Div. 2) 5
48 Restructuring Company Categories Codeforces VK Cup 2015 - Finals, online mirror 6
49 Ring Road 2 Categories Codeforces Codeforces Beta Round #27 (Codeforces format, Div. 2) 6
50 Table Compression Categories Codeforces Codeforces Round #345 (Div. 1) & Codeforces Round #345 (Div. 2) 6
51 Information Graph Categories Codeforces Codeforces Round #266 (Div. 2) 6
52 Polycarp and Hay Categories Codeforces Codeforces Round #346 (Div. 2) 6
53 Holes Categories Codeforces Codeforces Beta Round #13 6
54 Party Categories Codeforces ABBYY Cup 2.0 - Easy 6
55 New Year Domino Categories Codeforces Good Bye 2014 6
56 Party Categories Codeforces ABBYY Cup 2.0 - Easy 6
57 The Road to Berland is Paved With Good Intentions Categories Codeforces Codeforces Round #141 (Div. 2) 6
58 Love Triangles Categories Codeforces Codeforces Round #309 (Div. 1) & Codeforces Round #309 (Div. 2) 6
59 Gift Categories Codeforces All-Ukrainian School Olympiad in Informatics 7
60 Range Increments Categories Codeforces VK Cup 2012 Round 3 (Unofficial Div. 2 Edition) 7
61 Lucky Country Categories Codeforces Codeforces Beta Round #77 (Div. 1 Only) 7
62 Dima and Trap Graph Categories Codeforces Codeforces Round #214 (Div. 2) 7
63 Black and White Tree Categories Codeforces Codeforces Round #158 (Div. 2) 7
64 Nanami's Digital Board Categories Codeforces Codeforces Round #248 (Div. 2) & Codeforces Round #248 (Div. 1) 7
65 Beavermuncher-0xFF Categories Codeforces Codeforces Beta Round #69 (Div. 1 Only) & Codeforces Beta Round #69 (Div. 2 Only) 7
66 Peterson Polyglot Categories Codeforces Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) 7
67 Fairy Categories Codeforces Codeforces Beta Round #19 7
68 Pursuit For Artifacts Categories Codeforces Educational Codeforces Round 10 7
69 Bear and Square Grid Categories Codeforces Codeforces Round #356 (Div. 1) & Codeforces Round #356 (Div. 2) 7
70 Acyclic Organic Compounds Categories Codeforces Codeforces Round #333 (Div. 1) 7
71 Edges in MST Categories Codeforces Codeforces Round #111 (Div. 2) 7
72 Bear and Forgotten Tree 2 Categories Codeforces IndiaHacks 2016 - Online Edition (Div. 1 + Div. 2) 7
73 Weak Memory Categories Codeforces Codeforces Round #119 (Div. 1) & Codeforces Round #119 (Div. 2) 7
74 Envy Categories Codeforces Codeforces Round #446 (Div. 1) & Codeforces Round #446 (Div. 2) 7
75 Chessboard Billiard Categories Codeforces Codeforces Beta Round #68 7
76 Valera and Swaps Categories Codeforces Codeforces Round #252 (Div. 2) 7
77 Digit Tree Categories Codeforces Codeforces Round #372 (Div. 1) & Codeforces Round #372 (Div. 2) 7
78 Beard Graph Categories Codeforces Codeforces Round #112 (Div. 2) 7
79 Ski Base Categories Codeforces Codeforces Beta Round #75 (Div. 1 Only) & Codeforces Beta Round #75 (Div. 2 Only) 7
80 Fools and Foolproof Roads Categories Codeforces Codeforces Round #212 (Div. 2) 7
81 Counter Attack Categories Codeforces Codeforces Round #120 (Div. 2) 7
82 Petya and Spiders Categories Codeforces Codeforces Beta Round #85 (Div. 1 Only) & Codeforces Beta Round #85 (Div. 2 Only) 7
83 Vladik and Entertaining Flags Categories Codeforces Codeforces Round #416 (Div. 2) 8
84 DZY Loves Planting Categories Codeforces Codeforces Round #254 (Div. 1) 8
85 Interestring graph and Apples Categories Codeforces Codeforces Beta Round #9 (Div. 2 Only) 8
86 Dividing Kingdom II Categories Codeforces Codeforces Round #360 (Div. 1) 8
87 Building Forest Categories Codeforces Codeforces Round #123 (Div. 2) 8
88 Drazil and Morning Exercise Categories Codeforces Codeforces Round #292 (Div. 1) 8
89 Opening Portals Categories Codeforces Codeforces Round #124 (Div. 1) 8
90 Clearing Up Categories Codeforces Codeforces Round #101 (Div. 2) 8
91 Guard Towers Categories Codeforces Yandex.Algorithm 2011 Round 1 8
92 Three strings Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 8
93 Beautiful Road Categories Codeforces Codeforces Beta Round #73 (Div. 1 Only) 8
94 Trails and Glades Categories Codeforces VK Cup 2012 Finals, Practice Session 8
95 Ilya and Two Numbers Categories Codeforces Codeforces Round #186 (Div. 2) 8
96 Mad Joe Categories Codeforces CROC-MBTU 2012, Final Round (Online version, Div. 2) 8
97 Cutting a Fence Categories Codeforces VK Cup 2012 Finals (unofficial online-version) 9
98 Reclamation Categories Codeforces MemSQL start[c]up Round 1 9
99 Two Paths Categories Codeforces Codeforces Beta Round #36 9
100 The Red Button Categories Codeforces MemSQL start[c]up Round 1 9
101 Clockwork Bomb Categories Codeforces Codeforces Round #345 (Div. 1) 9
102 Hercule Poirot Problem Categories Codeforces School Personal Contest #2 (Winter Computer School 2010/11) - Codeforces Beta Round #43 (ACM-ICPC Rules) 9
103 Welcome home, Chtholly Categories Codeforces Codeforces Round #449 (Div. 1) 9
104 Alien DNA Categories Codeforces Codeforces Round #134 (Div. 1) 9
105 Savior Categories Codeforces Codeforces Beta Round #56 9
106 Timofey and our friends animals Categories Codeforces Codeforces Round #395 (Div. 1) 9
107 Pastoral Oddities Categories Codeforces Codeforces Round #334 (Div. 1) 9
108 Dima and Kicks Categories Codeforces Codeforces Round #208 (Div. 2) 9
109 Pairs Categories Codeforces Yandex.Algorithm Open 2011 Qualification 1 9
110 Appleman and Complicated Task Categories Codeforces Codeforces Round #263 (Div. 1) 9
111 Campus Categories Codeforces Codeforces Round #317 [AimFund Thanks-Round] (Div. 1) 10
112 School Categories Codeforces School Team Contest #3 (Winter Computer School 2010/11) 10
113 Leaders Categories Codeforces Yandex.Algorithm 2011 Finals 10
114 MUH and Lots and Lots of Segments Categories Codeforces Codeforces Round #269 (Div. 2) 10
115 Inna and Babies Categories Codeforces Codeforces Round #220 (Div. 2) 10
116 Entertaining Geodetics Categories Codeforces Codeforces Beta Round #81 10