Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round #849 (Div. 4)
43:19:52
Register now »
→ Filter Problems
Difficulty:
—
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x561
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x250
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x964
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x2893
1765J
Hero to Zero
graph matchings
,
math
2900
x91
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x465
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x882
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x218
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x272
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x182
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x401
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x374
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x444
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x1481
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x401
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1335
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x299
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x20941
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x124
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x523
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x370
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x1941
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x281
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x21307
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x479
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x39
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x238
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x7853
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x161
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x597
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2662
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x2972
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x8875
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1578
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x188
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x836
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x841
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1298
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1366
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x27834
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x877
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x257
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x511
1239D
Catowice City
2-sat
,
dfs and similar
,
graph matchings
,
graphs
2400
x1469
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x793
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x487
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x1675
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1261
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x628
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x488
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x348
1054F
Electric Scheme
flows
,
graph matchings
2700
x274
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x257
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x1954
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1204
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x636
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x554
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x145
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x772
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x234
739D
Recover a functional graph
graph matchings
3400
x127
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x93
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1584
590E
Birthday
graph matchings
,
strings
3200
x628
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x188
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x2863
491C
Deciphering
flows
,
graph matchings
2300
x321
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x37879
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x228
468D
Tree
graph matchings
3100
x295
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3306
387D
George and Interesting Graph
graph matchings
2200
x815
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x513
316C2
Tidying Up
flows
,
graph matchings
2300
x552
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1392
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x101097
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x164
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x311
120H
Brevity is Soul of Wit
graph matchings
1800
x1146
103E
Buying Sets
flows
,
graph matchings
2900
x606
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x368
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x663
User lists
Name