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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
to
May 23, 8:00 (UTC)
due to technical maintenance.
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Codeforces Round (Div. 1 + Div. 2)
2 days
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→ Filter Problems
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dfs and similar
combine-tags-by-or
*combine tags by OR
2-sat
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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
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implementation
interactive
math
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Problems
#
Name
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1874
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1535
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4390
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7354
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x995
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2484
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1742
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4674
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x5879
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2038
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x331
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x841
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13324
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x261
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8853
1250N
Wires
dfs and similar
,
graphs
,
greedy
2000
x1548
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16274
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1473
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6987
1239D
Catowice City
2-sat
,
dfs and similar
,
graph matchings
,
graphs
2400
x1900
1238F
The Maximum Subtree
dfs and similar
,
dp
,
graphs
,
trees
2200
x1692
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x168
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2549
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x571
1218H
Function Composition
dfs and similar
2900
x109
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4956
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x375
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4956
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2361
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1101
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8840
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2110
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x970
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x1033
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x1007
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1183
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7507
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x750
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x902
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x804
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x10998
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x411
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x1922
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10479
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5138
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3205
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x3760
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x17131
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1700
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3701
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6138
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4844
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x938
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8817
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x729
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1082
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x10829
1143C
Queen
dfs and similar
,
trees
1400
x11463
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2788
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2191
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12076
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3121
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1401
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3174
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8345
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1266
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x515
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5705
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x851
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13970
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3996
1103C
Johnny Solving
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x780
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4434
1100E
Andrew and Taxi
binary search
,
dfs and similar
,
graphs
2200
x2296
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x908
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x868
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8372
1093D
Beautiful Graph
dfs and similar
,
graphs
1700
x8509
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x7269
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1627
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x109
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x521
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2605
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1141
1065D
Three Pieces
dfs and similar
,
dp
,
shortest paths
2200
x1272
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x561
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1710
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3869
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x2985
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5781
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5689
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x622
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1550
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1239
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1312
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x956
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13908
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x361
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x583
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x12999
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