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Hello 2025
7 days
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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
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3839
260A
Adding Digits
implementation
,
math
1400
x15033
257C
View Angle
brute force
,
geometry
,
math
1800
x4408
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x2019
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4751
254C
Anagram
greedy
,
strings
1800
x1503
254B
Jury Size
brute force
,
implementation
1500
x2163
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2647
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10890
252B
Unsorting Array
brute force
,
sortings
1800
x1726
251B
Playing with Permutations
implementation
,
math
1800
x1280
250C
Movie Critics
greedy
1600
x2019
250B
Restoring IPv6
implementation
,
strings
1500
x2008
248B
Chilly Willy
math
,
number theory
1400
x5382
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9534
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2650
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6947
245E
Mishap in Club
greedy
,
implementation
1400
x3308
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2337
245C
Game with Coins
greedy
1700
x1555
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4537
243A
The Brand New Function
bitmasks
1600
x3969
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8870
239B
Easy Tape Programming
brute force
,
implementation
1500
x1378
238B
Boring Partition
constructive algorithms
1800
x1336
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5893
237B
Young Table
implementation
,
sortings
1500
x2246
235A
LCM Challenge
number theory
1600
x18124
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1488
234F
Fence
dp
1800
x1782
234E
Champions' League
implementation
1600
x1003
234D
Cinema
implementation
1600
x1542
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7588
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2581
231D
Magic Box
brute force
,
geometry
1600
x4120
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8720
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3639
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4777
229A
Shifts
brute force
,
two pointers
1500
x3546
228B
Two Tables
brute force
,
implementation
1400
x3475
226A
Flying Saucer Segments
math
1400
x4023
225C
Barcode
dp
,
matrices
1700
x9280
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3171
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7386
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2551
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2296
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x10554
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x9760
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6711
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5855
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1359
216C
Hiring Staff
greedy
1800
x1853
216B
Forming Teams
dfs and similar
,
implementation
1700
x6454
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x5019
213A
Game
dfs and similar
,
greedy
1700
x1727
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1783
209A
Multicolored Marbles
dp
,
math
1600
x2393
207D9
The Beaver's Problem - 3
1800
x88
207D7
The Beaver's Problem - 3
1600
x102
207D5
The Beaver's Problem - 3
1600
x148
207D1
The Beaver's Problem - 3
1800
x117
207B3
Military Trainings
1700
x181
207B1
Military Trainings
1600
x283
207A2
Beaver's Calculator 1.0
greedy
1800
x244
207A1
Beaver's Calculator 1.0
greedy
1600
x302
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x6056
204B
Little Elephant and Cards
binary search
,
data structures
1500
x5318
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5886
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1418
203C
Photographer
greedy
,
sortings
1400
x5723
202B
Brand New Easy Problem
brute force
1700
x820
201B
Guess That Car!
math
,
ternary search
1800
x1301
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x3022
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x918
200C
Football Championship
brute force
,
implementation
1800
x1063
198B
Jumping on Walls
shortest paths
1400
x4394
198A
About Bacteria
implementation
,
math
1700
x3165
197B
Limit
math
1400
x4656
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6419
195C
Try and Catch
expression parsing
,
implementation
1800
x1149
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x4059
191B
Demonstration
greedy
1700
x1015
191A
Dynasty Puzzles
dp
1500
x4074
190C
STL
dfs and similar
1500
x2896
190B
Surrounded
geometry
1800
x2865
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x267
188G
Array Sorting
*special problem
,
implementation
1600
x337
188F
Binary Notation
*special problem
,
implementation
1400
x305
188E
HQ9+
*special problem
,
implementation
1400
x506
188C
LCM
*special problem
,
implementation
,
math
1400
x458
187B
AlgoRace
dp
,
shortest paths
1800
x2000
187A
Permutations
greedy
1500
x2847
185B
Mushroom Scientists
math
,
ternary search
1800
x1673
183B
Zoo
brute force
,
geometry
1700
x700
183A
Headquarters
constructive algorithms
,
math
1700
x552
182E
Wooden Fence
dp
1800
x1467
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8159
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1796
180C
Letter
dp
1400
x7545
180A
Defragmentation
implementation
1800
x551
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