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Before contest
Codeforces Round 950 (Div. 3)
18:17:38
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graphs
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
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4322
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x463
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5224
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x765
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1578
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4349
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2300
x2015
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2299
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x607
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5496
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1024
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2302
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2844
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8872
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x416
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4880
773D
Perishable Roads
dp
,
graphs
,
shortest paths
2700
x567
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1191
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14718
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2541
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2136
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x4006
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3279
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x516
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10174
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x346
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x1911
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x445
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x483
757F
Team Rocket Rises Again
data structures
,
graphs
,
shortest paths
2800
x1101
755E
PolandBall and White-Red graph
constructive algorithms
,
graphs
,
shortest paths
2400
x818
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11759
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17596
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x189
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x634
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1356
744A
Hongcow Builds A Nation
dfs and similar
,
graphs
1500
x7964
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4256
741C
Arpa’s overnight party and Mehrdad’s silent entering
constructive algorithms
,
dfs and similar
,
graphs
2600
x2392
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4453
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x120
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1092
732F
Tourist Reform
dfs and similar
,
graphs
2300
x2257
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6809
730K
Roads Orientation Problem
graphs
3200
x94
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1954
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2155
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x1005
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1441
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1893
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6838
721C
Journey
dp
,
graphs
1800
x5700
718E
Matvey's Birthday
bitmasks
,
graphs
3300
x346
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x347
715B
Complete The Graph
binary search
,
constructive algorithms
,
graphs
,
shortest paths
2300
x2672
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4370
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x3041
707B
Bakery
graphs
1300
x12779
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x458
704B
Ant Man
dp
,
graphs
,
greedy
2500
x1569
702E
Analysis of Pathes in Functional Graph
data structures
,
graphs
2100
x2326
700C
Break Up
dfs and similar
,
graphs
2600
x1226
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3808
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5635
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3593
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5624
687E
TOF
dfs and similar
,
graphs
2900
x314
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x856
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x13856
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x504
683I
Loader
*special problem
,
graphs
2500
x38
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7019
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1722
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x312
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1533
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1833
666B
World Tour
graphs
,
shortest paths
2000
x2075
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1448
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1755
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7345
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1382
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2352
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1981
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1944
648E
Собери число
graphs
,
shortest paths
2300
x85
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x859
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2773
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3146
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x395
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6404
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x688
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1508
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x906
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1030
628F
Bear and Fair Set
flows
,
graphs
2500
x742
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x234
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x802
623A
Graph and String
constructive algorithms
,
graphs
1800
x4392
615B
Longtail Hedgehog
dp
,
graphs
1600
x4975
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2702
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