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Before contest
Codeforces Round #847 (Div. 3)
09:08:18
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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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Problems
#
Name
1792F2
Graph Coloring (hard version)
brute force
,
divide and conquer
,
dp
,
fft
,
graphs
x101
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x180
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x93
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x460
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1138
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x445
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x49
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x129
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x69
1687F
Koishi's Unconscious Permutation
fft
,
math
3500
x51
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x245
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x381
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x53
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x261
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x167
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x512
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1177
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x91
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x116
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x489
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x1972
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x143
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1524
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x646
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1004
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x811
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x189
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x21
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x500
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x111
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x93
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x306
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x289
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x266
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x9011
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x659
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x637
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x123
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x84
1349F1
Slime and Sequences (Easy Version)
dp
,
fft
,
math
3100
x301
1342E
Placing Rooks
combinatorics
,
fft
,
math
2300
x2322
1334G
Substring Search
bitmasks
,
brute force
,
fft
2900
x320
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x180
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x173
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x483
1251F
Red-White Fence
combinatorics
,
fft
2500
x700
1218E
Product Tuples
divide and conquer
,
fft
2500
x315
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x255
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x105
1119H
Triple
fft
,
math
3200
x374
1119E
Pavel and Triangles
brute force
,
dp
,
fft
,
greedy
,
ternary search
1900
x4133
1103E
Radix sum
fft
,
math
,
number theory
3400
x187
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1145
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x143
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1289
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x309
1010F
Tree
fft
,
graphs
,
trees
3400
x174
993E
Nikita and Order Statistics
chinese remainder theorem
,
fft
,
math
2300
x1178
986D
Perfect Encoding
fft
,
math
3100
x286
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x214
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x857
958F3
Lightsabers (hard)
fft
2600
x520
954I
Yet Another String Matching Problem
fft
,
math
2200
x821
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x370
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x739
901E
Cyclic Cipher
fft
,
math
3300
x66
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x325
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x174
827E
Rusty String
fft
,
math
,
strings
2700
x696
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x148
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x641
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x424
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x270
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1661
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2026
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x457
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x452
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x1771
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x330
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1495
300D
Painting Square
dp
,
fft
2300
x675
286E
Ladies' Shop
constructive algorithms
,
fft
,
math
2800
x757
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