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Please read
the new rule regarding the restriction on the use of AI tools
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Before contest
Codeforces Round (Div. 1)
3 weeks
Before contest
Codeforces Round (Div. 2)
3 weeks
→ Filter Problems
Difficulty:
—
math
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
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Custom test
Problems
#
Name
220D
Little Elephant and Triangle
geometry
,
math
2500
x283
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x251
217B
Blackboard Fibonacci
brute force
,
math
2100
x891
216E
Martian Luck
math
,
number theory
2000
x582
216A
Tiling with Hexagons
implementation
,
math
1200
x4997
215B
Olympic Medal
greedy
,
math
1300
x5564
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4961
212C
Cowboys
combinatorics
,
dp
,
math
2100
x387
209B
Pixels
constructive algorithms
,
math
2100
x375
209A
Multicolored Marbles
dp
,
math
1600
x2332
204C
Little Elephant and Furik and Rubik
math
,
probabilities
2000
x1098
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1417
201B
Guess That Car!
math
,
ternary search
1800
x1265
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2999
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x344
200B
Drinks
implementation
,
math
800
x115261
198A
About Bacteria
implementation
,
math
1700
x3149
197B
Limit
math
1400
x4634
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6297
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1039
195B
After Training
data structures
,
implementation
,
math
1300
x5196
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x8972
194B
Square
math
1200
x3515
194A
Exams
implementation
,
math
900
x9863
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x340
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x516
190A
Vasya and the Bus
greedy
,
math
1100
x5857
189B
Counting Rhombi
brute force
,
math
1300
x3941
188C
LCM
*special problem
,
implementation
,
math
1400
x451
185D
Visit of the Great
math
,
number theory
2600
x424
185B
Mushroom Scientists
math
,
ternary search
1800
x1635
185A
Plant
math
1300
x5882
183A
Headquarters
constructive algorithms
,
math
1700
x547
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8043
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2508
180B
Divisibility Rules
math
,
number theory
2300
x344
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x297
174A
Problem About Equation
math
1100
x2802
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2289
168A
Wizards and Demonstration
implementation
,
math
900
x10521
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x578
167C
Wizards and Numbers
games
,
math
2300
x669
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2148
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2036
166E
Tetrahedron
dp
,
math
,
matrices
1500
x20976
166C
Median
greedy
,
math
,
sortings
1500
x6479
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12229
160C
Find Pair
implementation
,
math
,
sortings
1700
x3450
154D
Flatland Fencing
games
,
math
2400
x429
154B
Colliders
math
,
number theory
1600
x4590
151A
Soft Drinking
implementation
,
math
800
x72350
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x641
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4133
150A
Win or Freeze
games
,
math
,
number theory
1400
x7772
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5376
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7192
148B
Escape
implementation
,
math
1500
x5465
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x92142
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1908
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13814
142A
Help Farmer
brute force
,
math
1600
x2612
141B
Hopscotch
geometry
,
math
1400
x5343
140A
New Year Table
geometry
,
math
1700
x4139
139B
Wallpaper
implementation
,
math
1600
x1299
136B
Ternary Logic
implementation
,
math
1100
x4859
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2346
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2019
131C
The World is a Theatre
combinatorics
,
math
1400
x11086
131B
Opposites Attract
implementation
,
math
1200
x7034
128E
Birthday
geometry
,
math
2900
x98
126D
Fibonacci Sums
dp
,
math
2300
x830
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1433
125A
Measuring Lengths in Baden
math
1400
x2715
124A
The number of positions
math
1000
x38176
123B
Squares
math
1800
x1114
120E
Put Knight!
games
,
math
1400
x2726
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3664
120A
Elevator
brute force
,
implementation
,
math
1000
x4588
117D
Not Quick Transformation
divide and conquer
,
math
2500
x336
117A
Elevator
implementation
,
math
1300
x2015
115C
Plumber
math
2200
x595
114A
Cifera
math
1000
x14104
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x119
113D
Museum
math
,
matrices
,
probabilities
2700
x674
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1232
112B
Petya and Square
implementation
,
math
1200
x4142
109E
Lucky Interval
brute force
,
math
2700
x101
108B
Datatypes
math
,
sortings
1400
x2458
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3457
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5975
101C
Vectors
implementation
,
math
2000
x698
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x62
100I
Rotation
*special problem
,
geometry
,
math
1500
x348
100E
Lamps in a Line
*special problem
,
math
1600
x271
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x476
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x302
95D
Horse Races
dp
,
math
2500
x425
94B
Friends
graphs
,
implementation
,
math
1300
x4659
93E
Lostborn
dp
,
math
,
number theory
2600
x498
93D
Flags
dp
,
math
,
matrices
2500
x347
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