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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
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shortest paths
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strings
ternary search
trees
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Problems
#
Name
177B1
Rectangular Game
number theory
1000
x2786
615D
Multipliers
math
,
number theory
2000
x2763
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x2750
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x2749
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x2711
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x2669
154B
Colliders
math
,
number theory
1600
x2617
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x2605
963A
Alternating Sum
math
,
number theory
1800
x2571
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x2567
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2550
294C
Shaass and Lights
combinatorics
,
number theory
1900
x2524
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x2517
7C
Line
math
,
number theory
1800
x2476
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x2457
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x2430
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x2414
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x2386
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x2384
1389E
Calendar Ambiguity
math
,
number theory
2200
x2330
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2274
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x2249
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2247
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x2242
359C
Prime Number
math
,
number theory
1900
x2227
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x2224
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2164
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2139
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x2104
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2095
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2093
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x2050
177B2
Rectangular Game
number theory
1200
x2037
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2017
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2013
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x1988
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x1966
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x1955
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x1943
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x1930
1097D
Makoto and a Blackboard
dp
,
math
,
number theory
,
probabilities
2200
x1916
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x1889
55D
Beautiful numbers
dp
,
number theory
2500
x1880
1334E
Divisor Paths
combinatorics
,
graphs
,
greedy
,
math
,
number theory
2200
x1852
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x1851
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x1841
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x1837
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x1819
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x1793
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x1782
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x1782
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x1756
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x1753
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x1721
955C
Sad powers
binary search
,
math
,
number theory
2100
x1712
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x1697
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x1687
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x1662
1033D
Divisors
interactive
,
math
,
number theory
2000
x1660
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x1627
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x1591
1055C
Lucky Days
math
,
number theory
1900
x1573
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x1568
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x1568
776E
The Holmes Children
math
,
number theory
2100
x1522
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x1493
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x1489
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1474
980D
Perfect Groups
dp
,
math
,
number theory
2100
x1470
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x1454
623B
Array GCD
dp
,
greedy
,
number theory
2300
x1451
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1446
117B
Very Interesting Game
brute force
,
number theory
1800
x1370
575H
Bots
combinatorics
,
number theory
1800
x1363
919E
Congruence Equation
chinese remainder theorem
,
math
,
number theory
2100
x1307
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x1290
78C
Beaver Game
dp
,
games
,
number theory
2000
x1280
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1250
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x1242
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x1239
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1167
172D
Calendar Reform
*special problem
,
number theory
1500
x1142
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x1138
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1135
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x1134
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1122
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1120
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1119
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1118
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1100
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1086
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1074
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1074
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1022
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1018
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x997
10C
Digital Root
number theory
2000
x976
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2300
x969
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x948
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x936
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