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Before contest
Codeforces Global Round 26
12:17:24
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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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Problems
#
Name
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14044
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2108
1523G
Try Booking
data structures
,
divide and conquer
3200
x404
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x136
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2510
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2062
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x18917
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2977
1470F
Strange Covering
divide and conquer
3500
x116
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x854
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9009
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3412
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1942
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1686
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1298
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2176
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x274
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x512
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x131
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4536
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1484
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4208
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2275
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5044
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x435
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18492
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x471
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x392
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x402
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x776
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15080
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x428
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x508
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1119
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x3013
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x201
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x582
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x3970
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x736
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2353
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7432
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1749
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x485
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x371
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x582
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x354
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4272
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1962
1218E
Product Tuples
divide and conquer
,
fft
2500
x361
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x315
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x557
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6856
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x1033
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2226
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x559
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x455
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x170
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x2415
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x439
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1593
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3219
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1466
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x10842
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2800
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3721
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6736
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x840
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x468
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1135
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1897
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x371
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1830
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x6127
1100F
Ivan and Burgers
data structures
,
divide and conquer
,
greedy
,
math
2500
x2144
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1393
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x65
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x217
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5768
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1459
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x329
1004F
Sonya and Bitwise OR
bitmasks
,
data structures
,
divide and conquer
2600
x712
1000F
One Occurrence
data structures
,
divide and conquer
2400
x3556
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x426
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x624
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1739
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x2012
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1832
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x185
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x899
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1413
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6707
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x2000
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x3020
868F
Yet Another Minimization Problem
divide and conquer
,
dp
2500
x3498
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x68
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1655
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x382
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x202
848C
Goodbye Souvenir
data structures
,
divide and conquer
2600
x1276
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x399
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