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Before contest
Codeforces Round (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
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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Status
Standings
Custom test
Problems
#
Name
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6204
1923C
Find B
constructive algorithms
,
greedy
1400
x13881
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16764
1923A
Moving Chips
greedy
,
implementation
800
x23794
1922F
Replace on Segment
dp
,
graph matchings
2500
x1201
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7277
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5372
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x17402
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x19611
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26302
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1171
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3585
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9201
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20576
1921C
Sending Messages
greedy
,
math
900
x28045
1921B
Arranging Cats
greedy
,
implementation
800
x32631
1921A
Square
greedy
,
math
800
x41035
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x426
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x905
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2460
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5264
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x12369
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19797
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26927
1919H
Tree Diameter
interactive
,
trees
2000
x135
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x173
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x759
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2072
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x799
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3673
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x17473
1919B
Plus-Minus Split
greedy
800
x29174
1919A
Wallet Exchange
games
,
math
800
x32285
1918G
Permutation of Given
constructive algorithms
,
math
2700
x434
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x809
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1618
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4431
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x13101
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22733
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x29290
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x919
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1300
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1695
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9717
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x20333
1917A
Least Product
constructive algorithms
,
math
800
x24645
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x510
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x591
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x140
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x434
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2133
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x8105
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x17105
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x24390
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24982
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5698
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x12302
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x19489
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x28646
1915C
Can I Square?
binary search
,
implementation
800
x39277
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x39864
1915A
Odd One Out
bitmasks
,
implementation
800
x52171
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1256
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1729
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3805
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11589
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11484
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x19312
1914C
Quests
greedy
,
math
1100
x21850
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x29186
1914A
Problemsolving Log
implementation
,
strings
800
x30470
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x295
1913E
Matrix Problem
flows
,
graphs
2400
x946
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2828
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x14180
1913B
Swap and Delete
strings
1000
x23435
1913A
Rating Increase
implementation
800
x22792
1912L
LOL Lovers
strings
800
x6560
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2165
1912J
Joy of Pokémon Observation
2300
x531
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x55
1912H
Hypercatapult Commute
graphs
2400
x385
1912G
Great City Saint Petersburg
data structures
2400
x433
1912F
Fugitive Frenzy
math
,
probabilities
3100
x109
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x807
1912D
Divisibility Test
math
1900
x1365
1912C
Cactus Transformation
constructive algorithms
3300
x54
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x960
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1935
1910J
Two Colors
*special problem
2900
x47
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x46
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x83
1910G
Pool Records
*special problem
,
greedy
2700
x56
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x167
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x183
1910D
Remove and Add
*special problem
,
greedy
1800
x327
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x607
1910B
Security Guard
*special problem
,
greedy
1600
x630
1910A
Username
*special problem
,
implementation
1100
x1659
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x103
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