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Before contest
Codeforces Round 941 (Div. 1)
09:11:12
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Before contest
Codeforces Round 941 (Div. 2)
09:11:12
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number theory
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
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matrices
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number theory
probabilities
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shortest paths
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ternary search
trees
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Problems
#
Name
870F
Paths
data structures
,
number theory
2700
x593
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x595
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x601
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x605
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x609
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x609
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x612
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x616
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x616
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1575G
GCD Festival
math
,
number theory
2200
x639
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x658
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x662
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
982E
Billiard
geometry
,
number theory
2600
x689
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x698
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x701
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x702
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x712
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x714
1208G
Polygons
greedy
,
math
,
number theory
2800
x720
582C
Superior Periodic Subarrays
number theory
2400
x725
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x738
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x739
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x740
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x757
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x757
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x762
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x771
225E
Unsolvable
math
,
number theory
2100
x777
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x806
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x807
838D
Airplane Arrangements
math
,
number theory
2700
x807
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x815
83D
Numbers
dp
,
math
,
number theory
2400
x817
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x829
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x832
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x844
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x852
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x855
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x860
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x909
1007B
Pave the Parallelepiped
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2400
x921
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x928
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x929
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x931
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x945
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x947
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x947
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x950
1812F
Factorization
*special problem
,
number theory
x950
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x961
585C
Alice, Bob, Oranges and Apples
number theory
2400
x961
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x965
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x970
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x982
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x992
45G
Prime Problem
number theory
2200
x993
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x997
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x998
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1002
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1003
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1011
300E
Empire Strikes Back
binary search
,
math
,
number theory
2300
x1024
17D
Notepad
number theory
2400
x1029
396B
On Sum of Fractions
math
,
number theory
x1033
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1037
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1041
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1060
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1061
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1061
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1075
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1090
915G
Coprime Arrays
math
,
number theory
2300
x1125
710D
Two Arithmetic Progressions
math
,
number theory
2500
x1153
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1176
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1179
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1179
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1181
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1182
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1201
1097F
Alex and a TV Show
bitmasks
,
combinatorics
,
number theory
2500
x1213
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1234
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1239
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1243
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1244
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1259
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1264
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1266
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1283
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1300
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1346
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1349
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1357
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1360
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1368
172D
Calendar Reform
*special problem
,
number theory
1500
x1381
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