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Before contest
Codeforces Round 945 (Div. 2)
4 days
→ Filter Problems
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
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x467
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x465
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x462
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x456
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x453
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x449
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x448
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x432
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x430
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x424
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x424
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x415
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x409
1523G
Try Booking
data structures
,
divide and conquer
3200
x403
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x396
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x395
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x394
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x389
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x384
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x380
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x373
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x372
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x371
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x370
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x370
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x368
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x358
1218E
Product Tuples
divide and conquer
,
fft
2500
x357
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x356
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x352
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x339
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x338
117D
Not Quick Transformation
divide and conquer
,
math
2500
x330
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x327
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x313
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x313
217C
Formurosa
divide and conquer
,
dp
,
expression parsing
2600
x312
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x310
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x308
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x308
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x279
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x273
1906K
Deck-Building Game
divide and conquer
,
math
2500
x264
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x250
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x203
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x201
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x195
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x195
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x190
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x170
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x169
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x151
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x134
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x130
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x122
1470F
Strange Covering
divide and conquer
3500
x115
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x108
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x96
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x78
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x70
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x64
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
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