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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
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May 23, 8:00 (UTC)
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Codeforces Round (Div. 1 + Div. 2)
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2-sat
binary search
bitmasks
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combinatorics
constructive algorithms
data structures
dfs and similar
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expression parsing
fft
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geometry
graph matchings
graphs
greedy
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Custom test
Problems
#
Name
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x761
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1576
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4345
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2300
x2014
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2286
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x604
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5473
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1020
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2300
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2840
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8864
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x415
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4858
773D
Perishable Roads
dp
,
graphs
,
shortest paths
2700
x565
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1189
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14670
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2537
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2119
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3987
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3273
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x514
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10145
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x345
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x1904
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x443
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x481
757F
Team Rocket Rises Again
data structures
,
graphs
,
shortest paths
2800
x1087
755E
PolandBall and White-Red graph
constructive algorithms
,
graphs
,
shortest paths
2400
x816
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11719
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17564
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x633
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1330
744A
Hongcow Builds A Nation
dfs and similar
,
graphs
1500
x7928
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4253
741C
Arpa’s overnight party and Mehrdad’s silent entering
constructive algorithms
,
dfs and similar
,
graphs
2600
x2383
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4447
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x119
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1089
732F
Tourist Reform
dfs and similar
,
graphs
2300
x2252
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6799
730K
Roads Orientation Problem
graphs
3200
x93
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1951
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2153
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x1001
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1440
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1886
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6825
721C
Journey
dp
,
graphs
1800
x5685
718E
Matvey's Birthday
bitmasks
,
graphs
3300
x343
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x345
715B
Complete The Graph
binary search
,
constructive algorithms
,
graphs
,
shortest paths
2300
x2663
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4366
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x3019
707B
Bakery
graphs
1300
x12769
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x457
704B
Ant Man
dp
,
graphs
,
greedy
2500
x1566
702E
Analysis of Pathes in Functional Graph
data structures
,
graphs
2100
x2276
700C
Break Up
dfs and similar
,
graphs
2600
x1221
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3790
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5621
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3588
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5613
687E
TOF
dfs and similar
,
graphs
2900
x310
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x854
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x13798
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x503
683I
Loader
*special problem
,
graphs
2500
x38
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7012
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1721
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1530
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1831
666B
World Tour
graphs
,
shortest paths
2000
x2073
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1446
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1753
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7336
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1379
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2347
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1968
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1942
648E
Собери число
graphs
,
shortest paths
2300
x84
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x849
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2769
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3142
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x394
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6401
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x687
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1497
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x903
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1028
628F
Bear and Fair Set
flows
,
graphs
2500
x738
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x233
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x798
623A
Graph and String
constructive algorithms
,
graphs
1800
x4366
615B
Longtail Hedgehog
dp
,
graphs
1600
x4970
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2697
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1586
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x578
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6992
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