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Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
15:11:12
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
15:11:12
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→ Filter Problems
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2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
332D
Theft of Blueprints
graphs
,
math
2400
x417
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x1028
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x8710
332A
Down the Hatch!
implementation
1300
x3724
331E2
Deja Vu
constructive algorithms
,
dp
3100
x236
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x218
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x204
331D2
Escaping on Beaveractor
graphs
2600
x158
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x223
331C3
The Great Julya Calendar
dp
2500
x624
331C2
The Great Julya Calendar
dp
2400
x440
331C1
The Great Julya Calendar
dp
1100
x7085
331B2
Shave Beaver!
data structures
1900
x831
331B1
Shave Beaver!
implementation
1700
x808
331A2
Oh Sweet Beaverette
data structures
,
sortings
1500
x1546
331A1
Oh Sweet Beaverette
brute force
,
implementation
1400
x1528
330B
Road Construction
constructive algorithms
,
graphs
1300
x19385
330A
Cakeminator
brute force
,
implementation
800
x31440
329E
Evil
math
3100
x183
329D
The Evil Temple and the Moving Rocks
constructive algorithms
2500
x436
329C
Graph Reconstruction
constructive algorithms
2400
x1010
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x7494
329A
Purification
constructive algorithms
,
greedy
1500
x4805
328B
Sheldon and Ice Pieces
greedy
1500
x1565
328A
IQ Test
implementation
1800
x2393
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1583
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2496
327C
Magic Five
combinatorics
,
math
1700
x3668
327B
Hungry Sequence
math
1200
x21636
327A
Flipping Game
brute force
,
dp
,
implementation
1200
x49897
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x949
325D
Reclamation
dsu
2900
x579
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x449
325B
Stadium and Games
binary search
,
math
1800
x1674
325A
Square and Rectangles
implementation
1500
x2301
323C
Two permutations
data structures
2400
x675
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x470
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x968
322B
Ciel and Flowers
combinatorics
,
math
1600
x13196
322A
Ciel and Dancing
greedy
1000
x8943
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x6272
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x594
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x9390
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x3836
321A
Ciel and Robot
binary search
,
implementation
,
math
1700
x3901
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7781
320A
Magic Numbers
brute force
,
greedy
900
x45416
319E
Ping-Pong
data structures
3000
x739
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x777
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x6590
319B
Psychos in a Line
data structures
,
implementation
1900
x4746
319A
Malek Dance Club
combinatorics
,
math
1600
x3024
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x8299
318A
Even Odds
math
900
x143088
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x172
317D
Game with Powers
dp
,
games
2300
x1257
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x550
317B
Ants
brute force
,
implementation
2000
x1659
317A
Perfect Pair
brute force
1600
x4938
316G3
Good Substrings
string suffix structures
2400
x542
316G2
Good Substrings
string suffix structures
2200
x518
316G1
Good Substrings
hashing
,
strings
1700
x1085
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x197
316F2
Suns and Rays
2300
x177
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x197
316E3
Summer Homework
data structures
,
math
2300
x572
316E2
Summer Homework
data structures
,
math
2300
x432
316E1
Summer Homework
brute force
,
data structures
1500
x1548
316D3
PE Lesson
dp
,
math
2400
x710
316D2
PE Lesson
dp
2300
x544
316D1
PE Lesson
brute force
,
dp
2300
x607
316C2
Tidying Up
flows
,
graph matchings
2300
x668
316C1
Tidying Up
flows
2200
x592
316B2
EKG
dfs and similar
,
dp
1600
x1780
316B1
EKG
brute force
,
dfs and similar
1500
x1498
316A2
Special Task
math
1400
x2295
316A1
Special Task
greedy
1100
x2888
315B
Sereja and Array
implementation
1200
x7721
315A
Sereja and Bottles
brute force
1400
x12293
314E
Sereja and Squares
dp
2900
x396
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x577
314C
Sereja and Subsequences
data structures
,
dp
2000
x2003
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1619
314A
Sereja and Contest
implementation
1600
x2172
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x599
313D
Ilya and Roads
dp
2100
x1691
313C
Ilya and Matrix
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x5940
313B
Ilya and Queries
dp
,
implementation
1100
x54500
313A
Ilya and Bank Account
implementation
,
number theory
900
x65035
312B
Archer
math
,
probabilities
1300
x13378
312A
Whose sentence is it?
implementation
,
strings
1100
x5357
311E
Biologist
flows
2300
x1575
311D
Interval Cubing
data structures
,
math
2600
x783
311C
Fetch the Treasure
brute force
,
data structures
,
graphs
,
shortest paths
2500
x547
311B
Cats Transport
data structures
,
dp
2400
x4302
311A
The Closest Pair
constructive algorithms
,
implementation
1300
x4225
309E
Sheep
binary search
,
greedy
2900
x299
309D
Tennis Rackets
brute force
,
geometry
2700
x186
309C
Memory for Arrays
binary search
,
bitmasks
,
greedy
1900
x1493
309B
Context Advertising
dp
,
two pointers
2100
x818
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