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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
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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Problems
#
Name
870F
Paths
data structures
,
number theory
2700
x593
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x597
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x607
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x609
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x610
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x615
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x615
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
x639
1575G
GCD Festival
math
,
number theory
2200
x640
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x659
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
x668
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
x702
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x703
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x715
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x719
1208G
Polygons
greedy
,
math
,
number theory
2800
x722
582C
Superior Periodic Subarrays
number theory
2400
x725
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x739
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x740
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x741
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x757
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x759
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x764
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x772
225E
Unsolvable
math
,
number theory
2100
x777
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x811
838D
Airplane Arrangements
math
,
number theory
2700
x813
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x816
83D
Numbers
dp
,
math
,
number theory
2400
x819
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x831
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x837
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x843
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x849
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x854
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x858
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x869
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x911
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x923
1007B
Pave the Parallelepiped
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2400
x931
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x932
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x933
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x934
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x947
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x949
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x949
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x955
1812F
Factorization
*special problem
,
number theory
x955
585C
Alice, Bob, Oranges and Apples
number theory
2400
x961
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x965
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x970
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x972
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x983
45G
Prime Problem
number theory
2200
x994
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x996
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x996
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x998
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x1000
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1003
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1011
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1018
300E
Empire Strikes Back
binary search
,
math
,
number theory
2300
x1025
396B
On Sum of Fractions
math
,
number theory
x1033
17D
Notepad
number theory
2400
x1036
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1038
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1041
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1061
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1065
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1076
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1080
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1093
915G
Coprime Arrays
math
,
number theory
2300
x1127
710D
Two Arithmetic Progressions
math
,
number theory
2500
x1156
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1178
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1182
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1183
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1183
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1188
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1201
1097F
Alex and a TV Show
bitmasks
,
combinatorics
,
number theory
2500
x1213
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1241
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1242
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1244
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1245
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1264
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1266
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1266
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1292
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1302
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1302
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1347
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1349
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1359
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1362
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1368
172D
Calendar Reform
*special problem
,
number theory
1500
x1382
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