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Before contest
Codeforces Round 877 (Div. 2)
06:34:58
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Difficulty:
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fft
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
1119E
Pavel and Triangles
brute force
,
dp
,
fft
,
greedy
,
ternary search
1900
x4248
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x9279
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2040
954I
Yet Another String Matching Problem
fft
,
math
2200
x860
1342E
Placing Rooks
combinatorics
,
fft
,
math
2300
x2481
993E
Nikita and Order Statistics
chinese remainder theorem
,
fft
,
math
2300
x1211
300D
Painting Square
dp
,
fft
2300
x687
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2146
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1314
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1234
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1203
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1202
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1060
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x275
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x1828
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1576
1251F
Red-White Fence
combinatorics
,
fft
2500
x727
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x550
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x475
1218E
Product Tuples
divide and conquer
,
fft
2500
x327
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1740
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x835
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x796
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x666
958F3
Lightsabers (hard)
fft
2600
x555
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x538
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x504
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x499
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x448
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x731
827E
Rusty String
fft
,
math
,
strings
2700
x731
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x695
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x519
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x514
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x268
286E
Ladies' Shop
constructive algorithms
,
fft
,
math
2800
x784
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x352
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x345
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x328
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x318
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x214
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x900
1334G
Substring Search
bitmasks
,
brute force
,
fft
2900
x329
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x306
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x298
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x286
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x410
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x127
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1557
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x387
1349F1
Slime and Sequences (Easy Version)
dp
,
fft
,
math
3100
x348
986D
Perfect Encoding
fft
,
math
3100
x295
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x279
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x220
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x193
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x112
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x23
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x728
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x467
1119H
Triple
fft
,
math
3200
x424
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x142
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x481
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x225
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x176
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x133
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x109
901E
Cyclic Cipher
fft
,
math
3300
x72
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x290
1103E
Radix sum
fft
,
math
,
number theory
3400
x199
1010F
Tree
fft
,
graphs
,
trees
3400
x186
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x183
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x155
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x155
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x122
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x188
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x150
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x119
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x99
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x92
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x79
1687F
Koishi's Unconscious Permutation
fft
,
math
3500
x65
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x60
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x59
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