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Contest is running
Codeforces Round 973 (Div. 2)
01:14:05
Before contest
Codeforces Round 974 (Div. 3)
23:14:05
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combine-tags-by-or
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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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Custom test
Problems
#
Name
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x5214
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5890
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6644
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x3232
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x3062
1203F1
Complete the Projects (easy version)
greedy
2100
x3521
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5092
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2531
1201D
Treasure Hunting
binary search
,
dp
,
greedy
,
implementation
2100
x2353
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7614
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4120
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x3560
1197D
Yet Another Subarray Problem
dp
,
greedy
,
math
1900
x5367
1195E
OpenStreetMap
data structures
,
two pointers
2100
x3060
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2265
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x8239
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2857
1185F
Two Pizzas
bitmasks
,
brute force
2100
x2037
1185E
Polycarp and Snakes
brute force
,
implementation
2000
x2645
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x942
1184E1
Daleks' Invasion (easy)
graphs
,
trees
1900
x1613
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x981
1183H
Subsequences (hard version)
dp
,
strings
1900
x3165
1183G
Candy Box (hard version)
greedy
,
implementation
,
sortings
2000
x2360
1183F
Topforces Strikes Back
brute force
,
math
,
sortings
2100
x2011
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4809
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3120
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4312
1176F
Destroy it!
dp
,
implementation
,
sortings
2100
x2028
1175D
Array Splitting
greedy
,
sortings
1900
x6178
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4680
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x4023
1168B
Good Triple
brute force
,
two pointers
1900
x3555
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2655
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2820
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2171
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1887
1163D
Mysterious Code
dp
,
strings
2100
x1266
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3619
1163C1
Power Transmission (Easy Edition)
brute force
,
geometry
1900
x3309
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1936
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2628
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3739
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x6070
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6900
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2833
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4962
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2415
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3321
1147C
Thanos Nim
games
2000
x3248
1147B
Chladni Figure
brute force
,
strings
1900
x2872
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1098
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4144
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2933
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2264
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4182
1141F1
Same Sum Blocks (Easy)
greedy
1900
x3845
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3334
1132F
Clear the String
dp
2000
x8131
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3249
1129B
Wrong Answer
constructive algorithms
2000
x2197
1120C
Compress String
dp
,
strings
2100
x2097
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1634
1119E
Pavel and Triangles
brute force
,
dp
,
fft
,
greedy
,
ternary search
1900
x4988
1117D
Magic Gems
dp
,
math
,
matrices
2100
x4217
1117C
Magic Ship
binary search
1900
x6967
1114D
Flood Fill
dp
1900
x6768
1108F
MST Unification
binary search
,
dsu
,
graphs
,
greedy
2100
x2894
1108E2
Array and Segments (Hard version)
data structures
,
implementation
2100
x2198
1106E
Lunar New Year and Red Envelopes
data structures
,
dp
2100
x2552
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x4081
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x3269
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1991
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4609
1098B
Nice table
brute force
,
constructive algorithms
,
greedy
,
math
2100
x1673
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x6129
1095E
Almost Regular Bracket Sequence
implementation
1900
x4101
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x8002
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1727
1090L
Berland University
greedy
,
math
2000
x1259
1090K
Right Expansion Of The Mind
math
2000
x1062
1090I
Minimal Product
2000
x1040
1090B
LaTeX Expert
1900
x1394
1089F
Fractions
math
1900
x1925
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2829
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1926
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x4458
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2583
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1542
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x3280
1077F1
Pictures with Kittens (easy version)
dp
1900
x4383
1076E
Vasya and a Tree
data structures
,
trees
1900
x3714
1070E
Getting Deals Done
binary search
,
data structures
2100
x1383
1070C
Cloud Computing
data structures
,
greedy
2000
x2032
1067A
Array Without Local Maximums
dp
1900
x2863
1066F
Yet another 2D Walking
dp
2100
x2034
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x3037
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2358
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x3129
1060D
Social Circles
greedy
,
math
1900
x3624
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