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Contest is running
Codeforces Round 973 (Div. 2)
01:08:47
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Codeforces Round 974 (Div. 3)
23:08:47
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*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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Custom test
Problems
#
Name
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2829
1088C
Ehab and a 2-operation task
constructive algorithms
,
greedy
,
math
1400
x8046
1088B
Ehab and subtraction
implementation
,
sortings
1000
x12575
1088A
Ehab and another construction problem
brute force
,
constructive algorithms
800
x16769
1086F
Forest Fires
math
3500
x239
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x518
1085F
Rock-Paper-Scissors Champion
2500
x605
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x1060
1085D
Minimum Diameter Tree
constructive algorithms
,
implementation
,
trees
1700
x5421
1085C
Connect Three
implementation
,
math
1600
x5427
1085B
Div Times Mod
math
1100
x9280
1085A
Right-Left Cipher
implementation
,
strings
800
x12138
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x8037
1084B
Kvass and the Fair Nut
greedy
,
implementation
1200
x7799
1084A
The Fair Nut and Elevator
brute force
,
implementation
1000
x7913
1083F
The Fair Nut and Amusing Xor
data structures
3300
x275
1083E
The Fair Nut and Rectangles
data structures
,
dp
,
geometry
2400
x4200
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x235
1083C
Max Mex
data structures
,
trees
2900
x890
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1926
1083A
The Fair Nut and the Best Path
data structures
,
dp
,
trees
1800
x5396
1082G
Petya and Graph
flows
,
graphs
2400
x2087
1082F
Speed Dial
dp
,
strings
,
trees
2800
x419
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x4458
1082D
Maximum Diameter Graph
constructive algorithms
,
graphs
,
implementation
1800
x3792
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5701
1082B
Vova and Trophies
greedy
1600
x7517
1082A
Vasya and Book
implementation
,
math
1200
x8535
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x105
1081G
Mergesort Strikes Back
math
,
probabilities
3200
x346
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x463
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2583
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x4036
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x7247
1081B
Farewell Party
constructive algorithms
,
implementation
1500
x4442
1081A
Definite Game
constructive algorithms
,
math
800
x12017
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x705
1080E
Sonya and Matrix Beauty
strings
2400
x1095
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1542
1080C
Masha and two friends
implementation
1500
x4031
1080B
Margarite and the best present
math
900
x11754
1080A
Petya and Origami
math
800
x18058
1078E
Negative Time Summation
constructive algorithms
3400
x87
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x3280
1077F1
Pictures with Kittens (easy version)
dp
1900
x4383
1077E
Thematic Contests
greedy
,
sortings
1800
x4667
1077D
Cutting Out
binary search
,
sortings
1600
x8846
1077C
Good Array
1300
x17137
1077B
Disturbed People
greedy
1000
x18930
1077A
Frog Jumping
math
800
x29860
1076G
Array Game
data structures
,
games
3000
x578
1076F
Summer Practice Report
dp
,
greedy
2500
x638
1076E
Vasya and a Tree
data structures
,
trees
1900
x3714
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x5156
1076C
Meme Problem
binary search
,
math
1300
x12409
1076B
Divisor Subtraction
implementation
,
math
,
number theory
1200
x12901
1076A
Minimizing the String
greedy
,
strings
1200
x13087
1075B
Taxi drivers and Lyft
implementation
,
sortings
1200
x4239
1075A
The King's Race
implementation
,
math
800
x8483
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x914
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x539
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2584
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6393
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4710
1073B
Vasya and Books
implementation
,
math
1000
x10546
1073A
Diverse Substring
implementation
,
strings
1000
x15430
1071E
Rain Protection
binary search
,
geometry
3500
x144
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x67
1070L
Odd Federalization
constructive algorithms
2600
x296
1070K
Video Posts
implementation
1100
x4880
1070J
Streets and Avenues in Berhattan
dp
2300
x694
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x725
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3643
1070G
Monsters and Potions
brute force
,
dp
,
greedy
,
implementation
2300
x834
1070F
Debate
greedy
1500
x3588
1070E
Getting Deals Done
binary search
,
data structures
2100
x1383
1070D
Garbage Disposal
greedy
1300
x4895
1070C
Cloud Computing
data structures
,
greedy
2000
x2032
1070B
Berkomnadzor
data structures
,
greedy
2400
x651
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x2334
1068C
Colored Rooks
constructive algorithms
,
graphs
1700
x3149
1068B
LCM
math
,
number theory
1200
x11482
1068A
Birthday
math
1400
x6788
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x439
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x386
1067C
Knights
constructive algorithms
2600
x640
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2659
1067A
Array Without Local Maximums
dp
1900
x2863
1066F
Yet another 2D Walking
dp
2100
x2034
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x6142
1066D
Boxes Packing
binary search
,
implementation
1800
x5452
1066C
Books Queries
implementation
1400
x9612
1066B
Heaters
greedy
,
two pointers
1500
x8291
1066A
Vova and Train
math
1100
x14500
1065G
Fibonacci Suffix
strings
2700
x254
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1165
1065E
Side Transmutations
combinatorics
,
strings
2300
x1071
1065D
Three Pieces
dfs and similar
,
dp
,
shortest paths
2200
x1302
1065C
Make It Equal
greedy
1600
x7797
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x10893
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