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Before contest
Codeforces Round 941 (Div. 1)
20:20:05
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Before contest
Codeforces Round 941 (Div. 2)
20:20:05
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→ Filter Problems
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trees
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
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1513
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x576
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x973
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1963
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1074
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x161
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x829
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1394
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1836
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3629
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6914
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9472
1610I
Mashtali vs AtCoder
games
,
trees
3100
x256
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x395
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6898
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x513
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2832
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1445
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11619
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2156
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7583
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x169
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1011
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x313
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2160
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x11921
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x756
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x965
1575I
Illusions of the Desert
data structures
,
trees
2300
x837
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x302
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4009
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2523
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13172
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x828
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3855
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x669
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1740
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2835
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2483
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2628
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7468
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x143
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5754
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x502
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2494
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x13804
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1822
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8577
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1801
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x799
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x435
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1679
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22057
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x326
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1417
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1243
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x842
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x279
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1190
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2488
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x759
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2041
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x621
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1213
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x422
1481F
AB Tree
dp
,
greedy
,
trees
3100
x451
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x954
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1330
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10762
1464F
My Beautiful Madness
data structures
,
trees
3500
x273
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1436
1458F
Range Diameter Sum
data structures
,
trees
3500
x258
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5496
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1964
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x451
1450G
Communism
bitmasks
,
dp
,
trees
3500
x231
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3385
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x551
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x214
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x608
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x948
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12283
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5830
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x302
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x130
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1826
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4161
1413F
Roads and Ramen
data structures
,
trees
2800
x699
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x926
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1874
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9794
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7070
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8845
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2208
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5672
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x319
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