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Codeforces Round 945 (Div. 2)
3 days
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*has extra registration
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Difficulty:
—
divide and conquer
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
1523G
Try Booking
data structures
,
divide and conquer
3200
x403
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x134
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2497
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2043
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x18844
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2943
1470F
Strange Covering
divide and conquer
3500
x115
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x848
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x8910
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3392
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1929
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1678
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1292
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2166
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x273
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x509
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x130
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4502
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1464
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4183
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2263
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5020
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x430
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18379
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x467
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x389
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x395
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x771
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x14993
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x424
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x504
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1114
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2987
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x196
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x580
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x3949
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x727
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2344
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7345
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1737
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x482
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x370
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x579
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x352
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4133
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1950
1218E
Product Tuples
divide and conquer
,
fft
2500
x357
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x313
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x541
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6631
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x1004
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2216
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x555
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x453
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x169
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x2400
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x432
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1559
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3203
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1450
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x10696
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2754
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3686
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6690
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x823
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x462
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1121
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1890
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x368
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1812
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x6110
1100F
Ivan and Burgers
data structures
,
divide and conquer
,
greedy
,
math
2500
x2122
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1380
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x64
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5728
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1445
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x327
1004F
Sonya and Bitwise OR
bitmasks
,
data structures
,
divide and conquer
2600
x700
1000F
One Occurrence
data structures
,
divide and conquer
2400
x3522
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x424
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x615
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1731
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1998
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1818
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x896
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1391
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6649
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1984
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x3004
868F
Yet Another Minimization Problem
divide and conquer
,
dp
2500
x3423
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1651
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x380
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x201
848C
Goodbye Souvenir
data structures
,
divide and conquer
2600
x1250
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x396
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x373
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4502
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