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Before contest
Educational Codeforces Round 169 (Rated for Div. 2)
10:20:15
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Difficulty:
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8906
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10426
1223C
Save the Nature
binary search
,
greedy
1600
x8125
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10147
1220B
Multiplication Table
math
,
number theory
1300
x11555
1219C
Periodic integer number
implementation
,
strings
1700
x1770
1218F
Workout plan
data structures
,
greedy
1500
x2910
1217C
The Number Of Good Substrings
binary search
,
bitmasks
,
brute force
1700
x7393
1217B
Zmei Gorynich
greedy
,
math
1600
x11144
1217A
Creating a Character
binary search
,
math
1300
x14880
1216D
Swords
math
1300
x11023
1216C
White Sheet
geometry
,
math
1700
x9128
1215D
Ticket Game
games
,
greedy
,
math
1700
x6053
1215C
Swap Letters
constructive algorithms
,
greedy
1500
x11046
1215B
The Number of Products
combinatorics
,
dp
,
implementation
1400
x12694
1214A
Optimal Currency Exchange
brute force
,
math
1400
x9069
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x11379
1213D1
Equalizing by Division (easy version)
brute force
,
implementation
1500
x11325
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x483
1211B
Traveling Around the Golden Ring of Berland
*special problem
,
implementation
1500
x760
1210B
Marcin and Training Camp
brute force
,
greedy
1700
x5748
1210A
Anadi and Domino
brute force
,
graphs
1700
x5138
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x9151
1209C
Paint the Digits
constructive algorithms
,
greedy
,
implementation
1500
x7454
1209B
Koala and Lights
implementation
,
math
,
number theory
1300
x8137
1208B
Uniqueness
binary search
,
brute force
,
implementation
,
two pointers
1500
x10314
1207C
Gas Pipeline
dp
,
greedy
1500
x9812
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6650
1203E
Boxers
greedy
,
sortings
1500
x13731
1203D2
Remove the Substring (hard version)
binary search
,
greedy
,
implementation
,
two pointers
1700
x7277
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8694
1203C
Common Divisors
implementation
,
math
1300
x20307
1202B
You Are Given a Decimal String...
brute force
,
dp
,
shortest paths
1700
x4542
1201C
Maximum Median
binary search
,
greedy
,
math
,
sortings
1400
x22820
1201B
Zero Array
greedy
,
math
1500
x18437
1200C
Round Corridor
math
,
number theory
1400
x9789
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9408
1198A
MP3
sortings
,
two pointers
1600
x8981
1197C
Array Splitting
greedy
,
sortings
1400
x13807
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9661
1196D1
RGB Substring (easy version)
implementation
1500
x10472
1196C
Robot Breakout
implementation
1500
x9299
1195D1
Submarine in the Rybinsk Sea (easy edition)
combinatorics
,
math
,
number theory
1500
x7853
1195C
Basketball Exercise
dp
1400
x25244
1194D
1-2-K Game
games
,
math
1700
x6452
1194C
From S To T
implementation
,
strings
1300
x13084
1194B
Yet Another Crosses Problem
implementation
1300
x10276
1190A
Tokitsukaze and Discard Items
implementation
,
two pointers
1400
x9315
1189C
Candies!
data structures
,
dp
,
implementation
,
math
1400
x10518
1188A1
Add on a Tree
trees
1600
x8358
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12134
1186D
Vus the Cossack and Numbers
constructive algorithms
,
greedy
,
math
1500
x8901
1185D
Extra Element
implementation
,
math
1700
x6673
1185C2
Exam in BerSU (hard version)
brute force
,
data structures
,
greedy
,
math
1700
x7422
1184D1
Parallel Universes (Easy)
implementation
1600
x2501
1184C1
Heidi and the Turing Test (Easy)
implementation
1600
x2286
1184B1
The Doctor Meets Vader (Easy)
binary search
,
sortings
1400
x5195
1183D
Candy Box (easy version)
greedy
,
sortings
1400
x13931
1183C
Computer Game
binary search
,
math
1400
x13877
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4407
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11085
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6287
1180B
Nick and Array
greedy
,
implementation
1500
x9511
1179A
Valeriy and Deque
data structures
,
implementation
1500
x10374
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7356
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x11842
1178B
WOW Factor
dp
,
strings
1300
x14902
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10862
1176C
Lose it!
dp
,
greedy
,
implementation
1300
x14036
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6752
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10511
1174C
Ehab and a Special Coloring Problem
constructive algorithms
,
number theory
1300
x11926
1169B
Pairs
graphs
,
implementation
1500
x9644
1168A
Increasing by Modulo
binary search
,
greedy
1700
x6714
1167D
Bicolored RBS
constructive algorithms
,
greedy
1500
x6906
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x17935
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x11284
1166C
A Tale of Two Lands
binary search
,
sortings
,
two pointers
1500
x9453
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8192
1165D
Almost All Divisors
math
,
number theory
1600
x15761
1165C
Good String
greedy
1300
x12839
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7164
1163B1
Cat Party (Easy Edition)
data structures
,
implementation
1500
x6923
1162B
Double Matrix
brute force
,
greedy
1400
x5792
1159B
Expansion coefficient of the array
implementation
,
math
1300
x7034
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x7038
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8309
1157C2
Increasing Subsequence (hard version)
greedy
1700
x7931
1157C1
Increasing Subsequence (easy version)
greedy
1300
x12540
1157B
Long Number
greedy
1300
x14612
1156A
Inscribed Figures
geometry
1400
x8167
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9202
1154D
Walking Robot
greedy
1500
x9875
1154C
Gourmet Cat
implementation
,
math
1400
x10325
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7371
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8876
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8341
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x11003
1148C
Crazy Diamond
constructive algorithms
,
sortings
1700
x5272
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7340
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