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Educational Codeforces Round 173 (Rated for Div. 2)
29:56:04
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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
#
Name
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x195
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x349
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x734
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1178
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2693
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x4219
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x7242
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x15661
1930A
Maximise The Score
greedy
,
sortings
800
x18895
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1829
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1739
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4918
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x15276
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x25530
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x31970
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x266
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1762
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x4397
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8780
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17920
1928A
Rectangle Cutting
geometry
,
math
800
x22989
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1734
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4522
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x14376
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x22374
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x28476
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x33981
1927A
Make it White
greedy
,
strings
800
x44435
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3708
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1750
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x12342
1926D
Vlad and Division
bitmasks
,
greedy
1300
x15951
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x27516
1926B
Vlad and Shapes
geometry
,
implementation
800
x33224
1926A
Vlad and the Best of Five
implementation
800
x50174
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3746
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x20468
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x29190
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x157
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x443
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x1051
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1186
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2646
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x14273
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x382
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x4033
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x7012
1923C
Find B
constructive algorithms
,
greedy
1400
x15561
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x18010
1923A
Moving Chips
greedy
,
implementation
800
x24981
1922F
Replace on Segment
dp
,
graph matchings
2500
x1445
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7882
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5830
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x18923
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x21048
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x27363
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1269
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3989
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x10018
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x21990
1921C
Sending Messages
greedy
,
math
900
x29809
1921B
Arranging Cats
greedy
,
implementation
800
x34149
1921A
Square
greedy
,
math
800
x44168
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x541
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x1030
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2794
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5715
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x14182
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x21221
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x28074
1919H
Tree Diameter
interactive
,
trees
2000
x145
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x183
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x881
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2224
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x895
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3948
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x19705
1919B
Plus-Minus Split
greedy
800
x29953
1919A
Wallet Exchange
games
,
math
800
x33737
1918G
Permutation of Given
constructive algorithms
,
math
2700
x481
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x913
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1777
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4936
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x14362
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x24223
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x30551
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x985
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1418
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1833
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x10726
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x23275
1917A
Least Product
constructive algorithms
,
math
800
x25734
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x545
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x622
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x151
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x503
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2297
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x8705
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x18165
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x26537
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