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European Championship 2025 - Online Mirror (Unrated, ICPC Rules, Teams Preferred)
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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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Problems
#
Name
1800A
Is It a Cat?
implementation
,
strings
800
x33165
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11758
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x20408
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17998
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x19047
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x22619
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23909
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x25457
1794A
Prefix and Suffix Array
strings
800
x17553
1793A
Yet Another Promotion
greedy
,
math
800
x18275
1792A
GamingForces
greedy
,
sortings
800
x28832
1791C
Prepend and Append
implementation
,
two pointers
800
x50773
1791B
Following Directions
geometry
,
implementation
800
x46944
1791A
Codeforces Checking
implementation
,
strings
800
x66571
1790B
Taisia and Dice
greedy
,
greedy
,
math
800
x27926
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x38160
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x16520
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x21049
1788A
One and Two
brute force
,
implementation
,
math
800
x34236
1787A
Exponential Equation
constructive algorithms
,
math
800
x19504
1786A2
Alternating Deck (hard version)
implementation
800
x11698
1786A1
Non-alternating Deck (easy version)
implementation
800
x14233
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x33149
1781A
Parallel Projection
geometry
,
math
800
x15284
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21980
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x24147
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x23452
1778A
Flip Flop Sum
greedy
,
implementation
800
x24789
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x17994
1777A
Everybody Likes Good Arrays!
greedy
,
math
800
x27618
1776A
Walking Boy
greedy
800
x7219
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x19142
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19914
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x22796
1773F
Football
constructive algorithms
800
x4345
1772B
Matrix Rotation
brute force
,
implementation
800
x30629
1772A
A+B?
implementation
800
x51212
1771A
Hossam and Combinatorics
combinatorics
,
math
,
sortings
900
x23569
1769A
Узкая дорога
*special problem
,
math
800
x2006
1768B
Quick Sort
greedy
,
math
900
x23877
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x29519
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x20815
1767A
Cut the Triangle
implementation
800
x20817
1766A
Extremely Round
brute force
,
implementation
800
x29706
1765B
Broken Keyboard
greedy
800
x9270
1764B
Doremy's Perfect Math Class
math
,
number theory
900
x16417
1764A
Doremy's Paint
greedy
800
x16870
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x16044
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x19585
1761A
Two Permutations
brute force
,
constructive algorithms
800
x22263
1760C
Advantage
data structures
,
implementation
,
sortings
800
x39083
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x47265
1760A
Medium Number
implementation
,
sortings
800
x65517
1759B
Lost Permutation
math
800
x22622
1759A
Yes-Yes?
implementation
,
strings
800
x30913
1758B
XOR = Average
constructive algorithms
900
x22051
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x25623
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x19194
1754A
Technical Support
greedy
800
x23596
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x16437
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x17314
1749B
Death's Blessing
greedy
900
x21472
1749A
Cowardly Rooks
greedy
,
implementation
800
x22661
1748A
The Ultimate Square
math
800
x24450
1747B
BAN BAN
constructive algorithms
900
x23923
1747A
Two Groups
constructive algorithms
,
greedy
800
x25524
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x17655
1746A
Maxmina
constructive algorithms
,
greedy
800
x20190
1744B
Even-Odd Increments
implementation
,
math
800
x23934
1744A
Number Replacement
greedy
,
implementation
800
x27668
1743B
Permutation Value
constructive algorithms
,
greedy
800
x22534
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x27471
1742C
Stripes
implementation
900
x34727
1742B
Increasing
greedy
,
implementation
,
sortings
800
x51315
1742A
Sum
implementation
800
x81378
1741B
Funny Permutation
constructive algorithms
,
math
800
x25846
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x31809
1740B
Jumbo Extra Cheese 2
geometry
,
greedy
,
sortings
800
x13947
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x20984
1739A
Immobile Knight
implementation
800
x23084
1738A
Glory Addicts
greedy
,
implementation
,
sortings
800
x13667
1737A
Ela Sorting Books
greedy
,
implementation
,
strings
900
x10331
1736A
Make A Equal to B
brute force
,
greedy
,
sortings
800
x23352
1735B
Tea with Tangerines
greedy
,
math
900
x18539
1735A
Working Week
constructive algorithms
,
greedy
,
math
800
x20513
1734B
Bright, Nice, Brilliant
constructive algorithms
800
x16013
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x21472
1733B
Rule of League
constructive algorithms
,
math
900
x20087
1733A
Consecutive Sum
greedy
,
sortings
800
x21210
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x15647
1731A
Joey Takes Money
greedy
,
math
800
x22884
1730A
Planets
data structures
,
greedy
,
sortings
800
x23493
1729B
Decode String
greedy
,
strings
800
x30880
1729A
Two Elevators
math
800
x41908
1728B
Best Permutation
constructive algorithms
,
greedy
800
x20290
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24890
1726A
Mainak and Array
greedy
,
math
900
x24168
1725A
Accumulation of Dominoes
math
800
x9471
1722C
Word Game
data structures
,
implementation
800
x32333
1722B
Colourblindness
implementation
800
x48938
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