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