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Before contest
Educational Codeforces Round 167 (Rated for Div. 2)
33:03:26
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Difficulty:
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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
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Status
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Custom test
Problems
#
Name
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6945
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x12393
1887F
Minimum Segments
constructive algorithms
3400
x119
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x339
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x835
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1616
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2763
1886F
Diamond Theft
data structures
,
greedy
3300
x162
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1368
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3394
1886C
Decreasing String
implementation
,
strings
1600
x10624
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x15488
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x24959
1885A
Deterministic Scheduling for Extended Reality over 5G and Beyond
*special problem
1884E
Hard Design
greedy
,
implementation
,
math
2800
x270
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2957
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5673
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12065
1884A
Simple Design
brute force
,
greedy
,
math
800
x16811
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5037
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9751
1883F
You Are So Beautiful
data structures
1400
x8657
1883E
Look Back
bitmasks
,
greedy
1700
x7409
1883D
In Love
data structures
,
greedy
1500
x10539
1883C
Raspberries
dp
,
math
1000
x24193
1883B
Chemistry
strings
900
x28564
1883A
Morning
math
800
x24615
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x287
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x977
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5126
1882C
Card Game
brute force
,
greedy
1500
x11668
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14768
1882A
Increasing Sequence
greedy
800
x24754
1881G
Anya and the Mysterious String
binary search
,
data structures
2000
x2225
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6266
1881E
Block Sequence
dp
1500
x12430
1881D
Divide and Equalize
math
,
number theory
1300
x15432
1881C
Perfect Square
brute force
,
implementation
1200
x16272
1881B
Three Threadlets
math
900
x24307
1881A
Don't Try to Count
brute force
,
strings
800
x28748
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x477
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1203
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6901
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x15586
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x21637
1879A
Rigged!
greedy
800
x22592
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1123
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3904
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11689
1878D
Reverse Madness
data structures
,
greedy
1600
x7856
1878C
Vasilije in Cacak
math
900
x29873
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x30498
1878A
How Much Does Daytona Cost?
greedy
800
x40575
1877C
Joyboard
math
,
number theory
1200
x10380
1877A
Goals of Victory
math
800
x20231
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x118
1876F
Indefinite Clownfish
binary search
,
graphs
3500
x123
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x259
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x832
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2182
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7770
1876A
Helmets in Night Light
greedy
,
sortings
1000
x15709
1875D
Jellyfish and Mex
dp
1600
x7913
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11126
1875A
Jellyfish and Undertale
brute force
,
greedy
900
x22936
1874G
Jellyfish and Inscryption
dp
3500
x79
1874F
Jellyfish and OEIS
dp
3500
x191
1874E
Jellyfish and Hack
dp
,
math
3000
x285
1874D
Jellyfish and Miku
divide and conquer
,
dp
,
math
,
probabilities
2800
x674
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
2300
x1542
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1091
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x16299
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6829
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x12265
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14500
1873E
Building an Aquarium
binary search
,
sortings
1100
x24204
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33602
1873C
Target Practice
implementation
,
math
800
x37025
1873B
Good Kid
brute force
,
greedy
,
math
800
x45932
1873A
Short Sort
brute force
,
implementation
800
x50570
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x4078
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5968
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12534
1872D
Plus Minus Permutation
math
1200
x21906
1872C
Non-coprime Split
math
,
number theory
1100
x22526
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x27105
1872A
Two Vessels
brute force
,
greedy
,
math
800
x37992
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x80
1870G
MEXanization
data structures
3300
x206
1870F
Lazy Numbers
binary search
,
math
2900
x469
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2252
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x6583
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11010
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13679
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18703
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x15033
1869A
Make It Zero
constructive algorithms
900
x19605
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x71
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x75
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x257
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