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Before contest
Codeforces Round 953 (Div. 2)
42:52:06
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Difficulty:
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graph matchings
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
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1095
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1340
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x648
1922F
Replace on Segment
dp
,
graph matchings
2500
x1189
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3770
1906I
Contingency Plan 2
graph matchings
2900
x127
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x155
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x979
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x432
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1494
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3697
1765J
Hero to Zero
graph matchings
,
math
2900
x188
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x670
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1027
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x413
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x372
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x291
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x518
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x476
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x583
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x2003
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x503
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1608
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x530
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x24216
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x148
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x609
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x681
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2172
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x475
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23915
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x592
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x49
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x320
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x9453
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x206
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x722
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2959
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3607
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10182
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1777
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x388
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1101
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x949
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1396
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1682
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x31958
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x1036
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x315
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x760
1239D
Catowice City
2-sat
,
dfs and similar
,
graph matchings
,
graphs
2400
x1919
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x1157
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x569
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x1973
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1689
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x734
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x537
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x429
1054F
Electric Scheme
flows
,
graph matchings
2700
x308
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x324
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2086
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1513
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x779
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x679
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x171
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x963
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x364
739D
Recover a functional graph
graph matchings
3400
x181
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x120
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1699
590E
Birthday
graph matchings
,
strings
3200
x752
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x212
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3323
491C
Deciphering
flows
,
graph matchings
2300
x403
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x47062
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x311
468D
Tree
graph matchings
3100
x357
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3989
387D
George and Interesting Graph
graph matchings
2200
x965
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x571
316C2
Tidying Up
flows
,
graph matchings
2300
x619
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1522
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x128581
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x192
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x347
120H
Brevity is Soul of Wit
graph matchings
1800
x1358
103E
Buying Sets
flows
,
graph matchings
2900
x828
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x402
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x810
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