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Before contest
Codeforces Round 941 (Div. 1)
26:03:46
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Before contest
Codeforces Round 941 (Div. 2)
26:03:46
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2-sat
binary search
bitmasks
brute force
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combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
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interactive
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Problems
#
Name
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x23972
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23726
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16892
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x14411
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x10138
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10089
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x9789
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x9353
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x8879
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7212
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4928
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4421
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3655
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3439
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3271
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2957
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x2949
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2891
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2788
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2731
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2305
510E
Fox And Dinner
flows
2300
x2139
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2071
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2044
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1936
1082G
Petya and Graph
flows
,
graphs
2400
x1919
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1882
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1796
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1764
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1696
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1638
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1603
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1592
237E
Build String
flows
,
graphs
2000
x1583
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1498
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1425
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1411
277E
Binary Tree on Plane
flows
,
trees
2400
x1232
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1223
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1184
863F
Almost Permutation
flows
2200
x1183
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1088
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1088
808F
Card Game
binary search
,
flows
,
graphs
2400
x1067
311E
Biologist
flows
2300
x1038
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x973
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x969
813D
Two Melodies
dp
,
flows
2600
x964
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x945
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x935
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x912
1473F
Strange Set
flows
,
math
2700
x902
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x898
1913E
Matrix Problem
flows
,
graphs
2400
x895
164C
Machine Programming
flows
,
graphs
2400
x874
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x832
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x816
103E
Buying Sets
flows
,
graph matchings
2900
x814
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x794
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x790
704D
Captain America
flows
,
greedy
3100
x775
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x767
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x746
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x730
628F
Bear and Fair Set
flows
,
graphs
2500
x728
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x718
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x701
708D
Incorrect Flow
flows
2900
x688
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x670
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x663
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x658
818G
Four Melodies
flows
,
graphs
2600
x624
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x621
717G
Underfail
flows
2400
x619
316C2
Tidying Up
flows
,
graph matchings
2300
x615
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x612
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x601
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x576
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x576
1090E
Horseback Riding
flows
,
graphs
2300
x573
1252L
Road Construction
flows
,
graphs
2300
x567
976F
Minimal k-covering
flows
,
graphs
2500
x561
316C1
Tidying Up
flows
2200
x545
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x538
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x532
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x531
802C
Heidi and Library (hard)
flows
2600
x528
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x525
132E
Bits of merry old England
flows
,
graphs
2700
x521
1061E
Politics
flows
,
graphs
2600
x510
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x509
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x508
1187G
Gang Up
flows
,
graphs
2500
x499
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x489
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x475
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x462
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x443
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x417
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x411
434D
Nanami's Power Plant
flows
2900
x395
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