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Before contest
Codeforces Round 941 (Div. 1)
10:20:39
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
10:20:39
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→ Filter Problems
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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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Custom test
Problems
#
Name
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x525
1938K
Tree Quiz
2400
x524
1488B
RBS Deletion
*special problem
,
greedy
1800
x524
1001H
Oracle for f(x) = parity of the number of 1s in x
*special problem
1200
x524
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x522
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x522
180A
Defragmentation
implementation
1800
x522
45E
Director
constructive algorithms
,
greedy
2000
x522
1424M
Ancient Language
graphs
,
sortings
2200
x521
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x521
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
132E
Bits of merry old England
flows
,
graphs
2700
x521
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x521
1812G
Colour Vision
*special problem
,
implementation
x520
542A
Place Your Ad Here
data structures
,
sortings
2400
x520
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x520
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x520
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x519
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x519
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x518
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x518
649B
Этажи
constructive algorithms
1400
x518
1117F
Crisp String
bitmasks
,
dp
2500
x517
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x517
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x516
652F
Ants on a Circle
constructive algorithms
,
math
2800
x516
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x515
690A3
Collective Mindsets (hard)
2400
x515
335C
More Reclamation
games
2100
x515
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x515
1912J
Joy of Pokémon Observation
2300
x514
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x514
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x514
909F
AND-permutations
constructive algorithms
2500
x514
889E
Mod Mod Mod
binary search
,
dp
,
math
3000
x514
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x514
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x514
100C
A+B
*special problem
,
implementation
1400
x514
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x513
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x513
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x513
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x512
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x512
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x512
480E
Parking Lot
data structures
,
divide and conquer
2800
x512
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x511
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x511
1061E
Politics
flows
,
graphs
2600
x511
394C
Dominoes
constructive algorithms
,
greedy
x511
1303F
Number of Components
dsu
,
implementation
2800
x510
1119H
Triple
fft
,
math
3200
x510
1028F
Make Symmetrical
brute force
2900
x510
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x510
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x509
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x509
8D
Two Friends
binary search
,
geometry
2600
x509
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x508
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x508
1290E
Cartesian Tree
data structures
3300
x508
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x507
241C
Mirror Box
geometry
,
implementation
2000
x507
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x506
1510J
Japanese Game
constructive algorithms
,
math
2700
x506
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x506
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x506
1357A2
Distinguish I, CNOTs and SWAP
x505
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x505
1677E
Tokitsukaze and Beautiful Subsegments
data structures
2900
x504
390D
Inna and Sweet Matrix
constructive algorithms
x504
316E3
Summer Homework
data structures
,
math
2300
x504
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x503
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x503
54D
Writing a Song
brute force
,
dp
,
strings
2100
x503
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x502
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x502
924E
Wardrobe
dp
,
greedy
2700
x502
698D
Limak and Shooting Points
brute force
,
geometry
,
math
2600
x502
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x502
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x501
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x501
1252B
Cleaning Robots
dp
,
trees
2300
x501
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x501
963E
Circles of Waiting
math
3100
x501
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x500
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x499
1187G
Gang Up
flows
,
graphs
2500
x499
1044F
DFS
data structures
2700
x499
409G
On a plane
*special problem
,
geometry
2200
x499
187D
BRT Contract
data structures
2800
x499
477D
Dreamoon and Binary
dp
,
strings
2700
x498
309B
Context Advertising
dp
,
two pointers
2100
x498
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x497
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x497
1145F
Neat Words
x496
297D
Color the Carpet
constructive algorithms
2500
x496
1679F
Formalism for Formalism
bitmasks
,
dp
,
math
2600
x495
858E
Tests Renumeration
greedy
,
implementation
2200
x495
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x495
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x494
268D
Wall Bars
dp
2300
x494
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