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Before contest
Codeforces Round 941 (Div. 1)
09:17:00
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
09:17:01
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→ Filter Problems
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interactive
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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Custom test
Problems
#
Name
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x13961
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x12824
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12287
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11783
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x11594
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11401
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11379
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x11103
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x10886
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x10571
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10499
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8651
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x8112
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7423
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7197
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x6887
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6831
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6719
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6714
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6463
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6460
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5957
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5754
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5596
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5428
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5224
1425F
Flamingoes of Mystery
interactive
1400
x5189
1010B
Rocket
binary search
,
interactive
1800
x5064
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4741
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4631
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4520
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4361
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4273
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4251
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4217
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4182
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3823
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3677
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3516
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3495
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3478
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3477
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3274
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3234
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3166
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x3165
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3072
1856D
More Wrong
divide and conquer
,
interactive
2100
x3063
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x2965
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2888
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2861
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2825
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2825
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x2787
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2771
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2754
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2628
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2375
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2315
1033D
Divisors
interactive
,
math
,
number theory
2000
x2302
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2275
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2212
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2156
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2132
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2090
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2059
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x2047
952B
A Map of the Cat
brute force
,
interactive
1900
x1990
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1950
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1940
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1928
1019B
The hat
binary search
,
interactive
2000
x1891
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1846
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1836
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1780
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1706
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1704
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1684
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1667
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1648
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1541
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1540
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1531
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1525
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1459
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1446
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1443
809B
Glad to see you!
binary search
,
interactive
2200
x1436
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1434
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1419
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1389
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1381
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1356
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1341
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1304
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1260
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1254
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1234
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1193
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1179
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