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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
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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
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Name
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x301
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x167
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x2945
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2352
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2160
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2106
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2055
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1939
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1783
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1754
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1722
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1717
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1709
1373F
Network Coverage
binary search
,
constructive algorithms
,
data structures
,
greedy
2400
x1618
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1559
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1504
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1470
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1469
1743E
FTL
binary search
,
dp
2400
x1462
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1454
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1441
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1439
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1353
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1351
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1350
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1319
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
626E
Simple Skewness
binary search
,
math
,
ternary search
2400
x1291
1101F
Trucks and Cities
binary search
,
dp
2400
x1252
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1228
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1123
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1107
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1088
808F
Card Game
binary search
,
flows
,
graphs
2400
x1066
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1047
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1038
1004E
Sonya and Ice Cream
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
trees
2400
x1007
125E
MST Company
binary search
,
graphs
2400
x1005
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x986
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x974
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x973
1016E
Rest In The Shades
binary search
,
geometry
2400
x928
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x907
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x896
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x865
865C
Gotta Go Fast
binary search
,
dp
2400
x809
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x742
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x734
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
853D
Michael and Charging Stations
binary search
,
dp
,
greedy
2400
x652
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x648
796E
Exam Cheating
binary search
,
dp
2400
x621
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x612
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x582
845E
Fire in the City
binary search
,
data structures
2400
x577
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x576
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x567
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x463
198E
Gripping Story
binary search
,
data structures
,
sortings
2400
x400
198C
Delivering Carcinogen
binary search
,
geometry
2400
x368
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x296
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x283
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x254
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x77
468C
Hack it!
binary search
,
constructive algorithms
,
math
2500
x2234
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2160
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2075
551E
GukiZ and GukiZiana
binary search
,
data structures
,
implementation
2500
x1648
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1574
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1503
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1438
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1378
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1338
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1335
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1303
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1290
992E
Nastya and King-Shamans
binary search
,
data structures
2500
x1263
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1256
1301E
Nanosoft
binary search
,
data structures
,
dp
,
implementation
2500
x1194
1334F
Strange Function
binary search
,
data structures
,
dp
,
greedy
2500
x1079
1307E
Cow and Treats
binary search
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
2500
x1074
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1066
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1066
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x953
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x945
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x921
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x894
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x867
555D
Case of a Top Secret
binary search
,
implementation
,
math
2500
x857
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x848
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x817
1468G
Hobbits
binary search
,
geometry
2500
x798
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x748
147B
Smile House
binary search
,
graphs
,
matrices
2500
x741
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x718
1055E
Segments on the Line
binary search
,
dp
2500
x707
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x703
1666E
Even Split
binary search
,
constructive algorithms
,
greedy
,
math
2500
x675
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