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Educational Codeforces Round 165 (Rated for Div. 2)
17:10:20
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combine-tags-by-or
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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
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3701
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7390
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15100
1928A
Rectangle Cutting
geometry
,
math
800
x21016
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1478
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3698
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12257
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18077
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25345
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30112
1927A
Make it White
greedy
,
strings
800
x39420
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2895
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1452
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9821
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13336
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x22746
1926B
Vlad and Shapes
geometry
,
implementation
800
x29426
1926A
Vlad and the Best of Five
implementation
800
x41391
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3188
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18090
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27037
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x123
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x384
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x754
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1027
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2256
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12214
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x322
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3121
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5802
1923C
Find B
constructive algorithms
,
greedy
1400
x12953
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16018
1923A
Moving Chips
greedy
,
implementation
800
x23075
1922F
Replace on Segment
dp
,
graph matchings
2500
x1149
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6980
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5163
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16737
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18894
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25773
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1110
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3410
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8837
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19852
1921C
Sending Messages
greedy
,
math
900
x27109
1921B
Arranging Cats
greedy
,
implementation
800
x31826
1921A
Square
greedy
,
math
800
x39672
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x394
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x867
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2334
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5058
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11718
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19134
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26378
1919H
Tree Diameter
interactive
,
trees
2000
x128
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x169
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x732
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2011
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x763
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3578
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16695
1919B
Plus-Minus Split
greedy
800
x28728
1919A
Wallet Exchange
games
,
math
800
x31603
1918G
Permutation of Given
constructive algorithms
,
math
2700
x417
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x764
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1535
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4213
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12436
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21959
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28620
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x889
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1260
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1644
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9333
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19253
1917A
Least Product
constructive algorithms
,
math
800
x24094
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x499
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x581
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x403
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2088
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7843
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16581
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23489
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24449
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5380
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11463
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18262
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x27424
1915C
Can I Square?
binary search
,
implementation
800
x37154
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38176
1915A
Odd One Out
bitmasks
,
implementation
800
x49134
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1211
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1658
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3646
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11155
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11065
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x17978
1914C
Quests
greedy
,
math
1100
x20555
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x28413
1914A
Problemsolving Log
implementation
,
strings
800
x29509
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