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strings problems
Problem Name Online Judge Year Contest Difficulty Level
1 Lecture Categories Codeforces Codeforces Round #284 (Div. 2) 1
2 Powers Et Al. Categories UVA 1
3 Party Games Categories Live Archive 2012 North America - Mid-Atlantic USA 1
4 Different is Good Categories Codeforces Codeforces Round #352 (Div. 2) 1
5 Watermelon Categories Codeforces Codeforces Beta Round #4 (Div. 2 Only) 1
6 Misha and Changing Handles Categories Codeforces Codeforces Round #285 (Div. 2) 1
7 Passwords Categories Codeforces Codeforces Round #374 (Div. 2) 1
8 Chat room Categories Codeforces Codeforces Beta Round #54 (Div. 2) 1
9 Mother bear Categories UVA 1
10 Two Substrings Categories Codeforces Codeforces Round #306 (Div. 2) 1
11 Hongcow Learns the Cyclic Shift Categories Codeforces Codeforces Round #385 (Div. 2) 1
12 String Cutting Categories Live Archive 2006 Asia - Hanoi 1
13 Translation Categories Codeforces Codeforces Beta Round #40 (Div. 2) 1
14 Mike and palindrome Categories Codeforces Codeforces Round #410 (Div. 2) 1
15 LetterStrings Categories TopCoder SRM 202 - Div2 easy] (5848) 1
16 To Carry or not to Carry Categories UVA 1
17 Word Capitalization Categories Codeforces Codeforces Round #172 (Div. 2) 1
18 cAPS lOCK Categories Codeforces Codeforces Beta Round #95 (Div. 2) 1
19 Pangram Categories Codeforces Codeforces Round #295 (Div. 2) 1
20 String Task Categories Codeforces Codeforces Beta Round #89 (Div. 2) 1
21 A+B Problem Categories PKU 1
22 Football Categories Codeforces Codeforces Beta Round #42 (Div. 2) 1
23 Amusing Joke Categories Codeforces Codeforces Round #101 (Div. 2) 1
24 Dubstep Categories Codeforces Codeforces Round #130 (Div. 2) 1
25 Mahmoud and Longest Uncommon Subsequence Categories Codeforces Codeforces Round #396 (Div. 2) 1
26 Decode the tape Categories UVA 1
27 Word Categories Codeforces Codeforces Beta Round #55 (Div. 2) 1
28 What's Cryptanalysis? Categories UVA 1
29 Glass Beads Categories SPOJ 1
30 Way Too Long Words Categories Codeforces Codeforces Beta Round #65 (Div. 2) 1
31 Football Categories Codeforces Codeforces Beta Round #77 (Div. 2 Only) 1
32 Helpful Maths Categories Codeforces Codeforces Round #197 (Div. 2) 1
33 Suffix Structures Categories Codeforces Codeforces Round #256 (Div. 2) 1
34 Flip Sort Categories UVA 1
35 k-String Categories Codeforces Codeforces Round #135 (Div. 2) 1
36 Petya and Strings Categories Codeforces Codeforces Beta Round #85 (Div. 2 Only) 1
37 Ostap and Grasshopper Categories Codeforces Codeforces Round #382 (Div. 2) 1
38 One-Two-Three Categories UVA 1
39 Power Strings Categories UVA 1
40 Comparing Strings Categories Codeforces Codeforces Round #118 (Div. 2) 2
41 Mike and strings Categories Codeforces Codeforces Round #410 (Div. 2) 2
42 Eevee Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 2
43 Valued Keys Categories Codeforces Codeforces Round #409 (rated, Div. 2, based on VK Cup 2017 Round 2) 2
44 Vitaly and Strings Categories Codeforces Codeforces Round #293 (Div. 2) 2
45 Strings with Same Letters Categories A2 Online Judge 2
46 Sinking Ship Categories Codeforces Codeforces Beta Round #59 (Div. 2) 2
47 String Game Categories Codeforces Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) 2
48 Uncompress Categories UVA 2
49 Find the Format String Categories Live Archive 2008 Asia - Dhaka 2
50 Comparing Two Long Integers Categories Codeforces Educational Codeforces Round 5 2
51 Tanya and Postcard Categories Codeforces Codeforces Round #293 (Div. 2) 2
52 Another Problem on Strings Categories Codeforces Codeforces Round #112 (Div. 2) 2
53 Restoring Password Categories Codeforces Codeforces Beta Round #76 (Div. 2 Only) 2
54 Combination Categories Codeforces Codeforces Round #109 (Div. 2) 2
55 Little Elephant and Chess Categories Codeforces Codeforces Round #157 (Div. 2) 2
56 Equivalent Strings Categories Codeforces Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) 2
57 Message Decoding Categories UVA 2
58 Mr. Kitayuta's Gift Categories Codeforces Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) & Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) 2
59 Palindromic Times Categories Codeforces Codeforces Beta Round #83 (Div. 2 Only) 2
60 Anagram String Categories A2 Online Judge 2
61 Chuỗi từ Categories SPOJ Vietnam 2
62 Hacking Cypher Categories Codeforces Codeforces Round #279 (Div. 2) 2
63 Password Categories Codeforces Codeforces Beta Round #93 (Div. 1 Only) & Codeforces Beta Round #93 (Div. 2 Only) 2
64 Strings of Power Categories Codeforces Codeforces Round #188 (Div. 2) 2
65 War of the Corporations Categories Codeforces Codeforces Round #342 (Div. 2) 2
66 Ohana Cleans Up Categories Codeforces Codeforces Round #309 (Div. 2) 2
67 Pattern Finder Categories Live Archive 2008 South Pacific 2
68 Bear and Strings Categories Codeforces Codeforces Round #226 (Div. 2) 2
69 Queries on a String Categories Codeforces Educational Codeforces Round 1 2
70 Longest Regular Bracket Sequence Categories Codeforces Codeforces Beta Round #5 3
71 Help Far Away Kingdom Categories Codeforces Codeforces Beta Round #78 (Div. 2 Only) 3
72 Good Substrings Categories Codeforces Codeforces Round #166 (Div. 2) 3
73 Haiku Categories Codeforces Codeforces Beta Round #70 (Div. 2) 3
74 Tin mật Categories SPOJ Vietnam 3
75 Petya and Java Categories Codeforces Codeforces Beta Round #61 (Div. 2) 3
76 Friendly Int Parser Categories URI 3
77 LLPS Categories Codeforces Codeforces Round #127 (Div. 2) 3
78 Known Plaintext Attack Categories UVA 3
79 Bear and Compressing Categories Codeforces IndiaHacks 2016 - Online Edition (Div. 1 + Div. 2) 3
80 No to Palindromes! Categories Codeforces Codeforces Round #265 (Div. 1) & Codeforces Round #265 (Div. 2) 3
81 Internet Address Categories Codeforces CROC-MBTU 2012, Elimination Round (ACM-ICPC) 3
82 Mahmoud and a Message Categories Codeforces Codeforces Round #396 (Div. 2) 3
83 Phone Numbers Categories Codeforces Codeforces Round #107 (Div. 2) 3
84 Lucky String Categories Codeforces Codeforces Beta Round #84 (Div. 2 Only) 3
85 Prime Palindrome Categories A2 Online Judge 3
86 Simple Strings Categories Codeforces Educational Codeforces Round 12 3
87 DNA Alignment Categories Codeforces Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1) 3
88 Common Divisors Categories Codeforces Codeforces Round #117 (Div. 2) 3
89 Cloud of Hashtags Categories Codeforces Codeforces Round #401 (Div. 2) 3
90 Letter Categories Codeforces Codeforces Beta Round #42 (Div. 2) 3
91 Whose sentence is it? Categories Codeforces Codeforces Round #185 (Div. 2) 3
92 The Text Splitting Categories Codeforces Educational Codeforces Round 4 3
93 Watto and Mechanism Categories Codeforces Codeforces Round #291 (Div. 2) 3
94 Secret Word Categories UVA 3
95 Queries for Number of Palindromes Categories Codeforces CROC-MBTU 2012, Elimination Round (ACM-ICPC) 4
96 Choosing Symbol Pairs Categories Codeforces Codeforces Beta Round #47 4
97 Anagram Search Categories Codeforces Codeforces Round #103 (Div. 2) 4
98 Dinner Categories SPOJ 4
99 A Lot of Games Categories Codeforces Codeforces Round #260 (Div. 1) & Codeforces Round #260 (Div. 2) 4
100 New Problem Categories Codeforces Codeforces Round #170 (Div. 2) 4
101 African Crossword Categories Codeforces Codeforces Beta Round #74 (Div. 2 Only) 4
102 The Smallest String Concatenation Categories Codeforces Educational Codeforces Round 9 4
103 Prefixes and Suffixes Categories Codeforces Codeforces Round #246 (Div. 2) 4
104 Train and Peter Categories Codeforces Codeforces Beta Round #8 4
105 ZgukistringZ Categories Codeforces Codeforces Round #307 (Div. 2) 4
106 Omar's Bug Categories A2 Online Judge 4
107 Matrix Matcher Categories UVA 4
108 Dima and Text Messages Categories Codeforces Codeforces Round #208 (Div. 2) 4
109 String Manipulation 1.0 Categories Codeforces VK Cup 2012 Qualification Round 2 4
110 Command Line Arguments Categories Codeforces Croc Champ 2013 - Qualification Round 4
111 Page Numbers Categories Codeforces Codeforces Beta Round #34 (Div. 2) 4
112 Center Alignment Categories Codeforces Codeforces Beta Round #5 4
113 Help Kingdom of Far Far Away 2 Categories Codeforces Codeforces Round #102 (Div. 2) 4
114 Ancient Prophesy Categories Codeforces Codeforces Round #158 (Div. 2) 4
115 Tavas and Malekas Categories Codeforces Codeforces Round #299 (Div. 2) & Codeforces Round #299 (Div. 1) 4
116 Hard Work Categories Codeforces Codeforces Beta Round #57 (Div. 2) 4
117 Palindrome pairs Categories Codeforces VK Cup 2012 Qualification Round 2 4
118 MUH and Cube Walls Categories Codeforces Codeforces Round #269 (Div. 2) 4
119 Pattern Categories Codeforces Coder-Strike 2014 - Round 1 4
120 Facetook Priority Wall Categories Codeforces Codeforces Beta Round #67 (Div. 2) 5
121 Running Track Categories Codeforces Codeforces Round #338 (Div. 2) 5
122 Grammar Lessons Categories Codeforces Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only) 5
123 Newspaper Headline Categories Codeforces Codeforces Beta Round #75 (Div. 1 Only) & Codeforces Beta Round #75 (Div. 2 Only) 5
124 Palindrome Degree Categories Codeforces Codeforces Beta Round #7 5
125 Lucky Transformation Categories Codeforces Codeforces Beta Round #91 (Div. 1 Only) & Codeforces Beta Round #91 (Div. 2 Only) 5
126 A Simple Task Categories Codeforces Codeforces Round #312 (Div. 2) 5
127 Punctuation Categories Codeforces Codeforces Testing Round #4 5
128 Lucky Common Subsequence Categories Codeforces Codeforces Round #201 (Div. 1) & Codeforces Round #201 (Div. 2) 5
129 Petr# Categories Codeforces Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only) 5
130 Prime Permutation Categories Codeforces Codeforces Beta Round #92 (Div. 1 Only) & Codeforces Beta Round #92 (Div. 2 Only) 5
131 Correcting Mistakes Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 5
132 Sysadmin Bob Categories Codeforces Codeforces Beta Round #31 (Div. 2, Codeforces format) 5
133 Spy Syndrome 2 Categories Codeforces Manthan, Codefest 16 5
134 New Year and Ancient Prophecy Categories Codeforces Good Bye 2015 5
135 Pretty Song Categories Codeforces Codeforces Round #289 (Div. 2, ACM ICPC Rules) 5
136 Sequence Formatting Categories Codeforces Yandex.Algorithm Open 2011 Qualification 1 5
137 Fancy Number Categories Codeforces Codeforces Beta Round #89 (Div. 2) 5
138 Obsessive String Categories Codeforces Codeforces Round #282 (Div. 1) & Codeforces Round #282 (Div. 2) 5
139 Alyona and Strings Categories Codeforces Codeforces Round #358 (Div. 2) 5
140 GuessTheSubstring Categories TopCoder TCO11 Semifinal 1 - Div1 medium] (14649) 5
141 Famil Door and Brackets Categories Codeforces Codeforces Round #343 (Div. 2) 5
142 Om Nom and Necklace Categories Codeforces ZeptoLab Code Rush 2015 6
143 Unique Strings Categories SPOJ 6
144 Test Categories Codeforces Codeforces Beta Round #25 (Div. 2 Only) 6
145 Vần hoàn hảo Categories SPOJ Vietnam 6
146 Two Strings Categories Codeforces Codeforces Round #138 (Div. 1) & Codeforces Round #138 (Div. 2) 6
147 Substitutes in Number Categories Codeforces Codeforces Round #265 (Div. 1) & Codeforces Round #265 (Div. 2) 6
148 Dreamoon and Strings Categories Codeforces Codeforces Round #272 (Div. 2) & Codeforces Round #272 (Div. 1) 6
149 Messenger Categories Codeforces Codeforces Round #344 (Div. 2) 6
150 Sereja and Periods Categories Codeforces Codeforces Round #187 (Div. 1) & Codeforces Round #187 (Div. 2) 6
151 Spelling Check Categories Codeforces School Team Contest #1 (Winter Computer School 2010/11) 6
152 Match & Catch Categories Codeforces Codeforces Round #244 (Div. 2) 6
153 Restoring IPv6 Categories Codeforces CROC-MBTU 2012, Final Round (Online version, Div. 2) 6
154 Work Group Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 6
155 Do the Untwist Categories Live Archive 1998 North America - Mid-Central USA 6
156 Beaver Categories Codeforces Codeforces Beta Round #71 6
157 Martian Strings Categories Codeforces Codeforces Round #106 (Div. 2) 6
158 Text Messaging Categories Codeforces Codeforces Beta Round #64 6
159 Wizards and Minimal Spell Categories Codeforces Codeforces Round #114 (Div. 2) 6
160 Hockey Categories Codeforces Codeforces Beta Round #77 (Div. 1 Only) & Codeforces Beta Round #77 (Div. 2 Only) 6
161 Fedor and Essay Categories Codeforces Codeforces Round #267 (Div. 2) 6
162 Making Genome in Berland Categories Codeforces VK Cup 2016 - Qualification Round 2 6
163 String Categories Codeforces Codeforces Beta Round #94 (Div. 1 Only) & Codeforces Beta Round #94 (Div. 2 Only) 6
164 Kefa and Watch Categories Codeforces Codeforces Round #321 (Div. 2) 6
165 Alphabetic Relation Categories SPOJ 6
166 Ann and Half-Palindrome Categories Codeforces Codeforces Round #311 (Div. 2) 7
167 Hostname Aliases Categories Codeforces CROC 2016 - Qualification 7
168 String Mark Categories Codeforces Codeforces Round #448 (Div. 2) 7
169 Marbles Categories Codeforces Codeforces Round #336 (Div. 1) & Codeforces Round #336 (Div. 2) 7
170 Intellectual Inquiry Categories Codeforces CROC 2016 - Elimination Round 7
171 Cyclical Quest Categories Codeforces Codeforces Round #146 (Div. 1) & Codeforces Round #146 (Div. 2) 7
172 Vladik and chat Categories Codeforces Codeforces Round #390 (Div. 2) 7
173 Good Substrings Categories Codeforces ABBYY Cup 3.0 7
174 Logging Categories Codeforces Codeforces Beta Round #16 (Div. 2 Only) 7
175 Encoding Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 7
176 Log Stream Analysis Categories Codeforces CROC-MBTU 2012, Elimination Round (ACM-ICPC) 7
177 Vasya and Types Categories Codeforces Codeforces Beta Round #73 (Div. 1 Only) & Codeforces Beta Round #73 (Div. 2 Only) 7
178 Tree-String Problem Categories Codeforces Croc Champ 2013 - Qualification Round 7
179 Mike and Friends Categories Codeforces Codeforces Round #305 (Div. 1) 8
180 e-Government Categories Codeforces VK Cup 2012 Round 2 8
181 Tricky and Clever Password Categories Codeforces Codeforces Beta Round #30 (Codeforces format) 8
182 Gnikool Ssalg Categories Codeforces Unknown Language Round #4 8
183 Alphabet Permutations Categories Codeforces Codeforces Round #337 (Div. 2) 8
184 Name Categories Codeforces Codeforces Round #116 (Div. 2, ACM-ICPC Rules) 8
185 Calendar Categories Codeforces Codeforces Beta Round #54 (Div. 2) 8
186 DZY Loves Strings Categories Codeforces Codeforces Round #254 (Div. 1) 8
187 Matching Names Categories Codeforces VK Cup 2015 - Finals, online mirror 8
188 Two Permutations Categories Codeforces Codeforces Round #131 (Div. 1) 8
189 Three strings Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 8
190 Palisection Categories Codeforces Codeforces Beta Round #17 8
191 And Yet Another Bracket Sequence Categories Codeforces VK Cup 2015 - Round 1 9
192 String Transformation Categories Codeforces Codeforces Beta Round #90 9
193 Representative Sampling Categories Codeforces ABBYY Cup 2.0 - Hard 9
194 The Next Good String Categories Codeforces Codeforces Round #124 (Div. 1) 9
195 World of Mouth Categories Codeforces Unknown Language Round #3 9
196 Dreamoon and Binary Categories Codeforces Codeforces Round #272 (Div. 1) 9
197 Xenia and String Problem Categories Codeforces Codeforces Round #207 (Div. 1) 9
198 Birthday Categories Codeforces Codeforces Round #327 (Div. 1) 9
199 Expensive Strings Categories Codeforces Educational Codeforces Round 5 9
200 Cool Slogans Categories Codeforces Codeforces Round #364 (Div. 1) 9
201 Have You Ever Heard About the Word? Categories Codeforces Codeforces Round #189 (Div. 1) 9
202 Smart Boy Categories Codeforces School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round #38 (ACM-ICPC Rules) 9
203 Fibonacci Strings Categories Codeforces ABBYY Cup 2.0 - Easy 10
204 Hongcow Masters the Cyclic Shift Categories Codeforces Codeforces Round #385 (Div. 1) 10
205 Mutation Categories Codeforces All-Ukrainian School Olympiad in Informatics 10
206 #dynamic-programming&nbsp;(168)</span> Categories SPOJ 10
207 Puzzle Lover Categories Codeforces Codeforces Round #339 (Div. 1) 10
208 Suffix Subgroup Categories Codeforces Friday the 13th, Programmers Day 10
209 Digits of Number Pi Categories Codeforces Codeforces Round #325 (Div. 1) 10
210 Duff is Mad Categories Codeforces Codeforces Round #326 (Div. 1) 10
211 Pattern Matching Categories Live Archive 2004 Asia - Manila 10
212 Cutting the Line Categories Codeforces Codeforces Round #330 (Div. 1) 10
213 Fibonacci Strings Categories Codeforces ABBYY Cup 2.0 - Easy 10
214 Rap God Categories Codeforces Codeforces Round #406 (Div. 1) 10
215 Ali goes shopping Categories Codeforces Unknown Language Round #2 10
216 Wire Crossing Categories UVA 10