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Educational Codeforces Round 167 (Rated for Div. 2)
06:34:15
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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
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2103
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2124
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13879
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21407
1837B
Comparison String
greedy
900
x27508
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x30214
1836B
Astrophysicists
greedy
,
math
1100
x12409
1836A
Destroyer
implementation
,
sortings
800
x20004
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x157
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x217
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x457
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x949
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x917
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7579
1834F
Typewriter
brute force
,
math
2500
x496
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2111
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4458
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12872
1834B
Maximum Strength
greedy
,
math
1000
x14792
1834A
Unit Array
greedy
,
math
800
x22381
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x5048
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6930
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10896
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12928
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25738
1833B
Restore the Weather
greedy
,
sortings
900
x25749
1833A
Musical Puzzle
implementation
,
strings
800
x31957
1832F
Zombies
binary search
,
dp
3200
x259
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2087
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1821
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2833
1832C
Contrast Value
greedy
,
implementation
1200
x19035
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20353
1832A
New Palindrome
strings
800
x25117
1831B
Array merging
constructive algorithms
,
greedy
1000
x19270
1831A
Twin Permutations
constructive algorithms
800
x25041
1830F
The Third Grace
data structures
,
dp
3200
x236
1830E
Bully Sort
data structures
,
math
3500
x234
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x616
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1566
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4693
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12798
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7310
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9733
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16556
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18883
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24917
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27645
1829B
Blank Space
implementation
800
x42379
1829A
Love Story
implementation
,
strings
800
x47655
1828B
Permutation Swap
math
,
number theory
900
x21448
1828A
Divisible Array
constructive algorithms
,
math
800
x23222
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x111
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x370
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x716
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1160
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1794
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3729
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17953
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x342
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1528
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8935
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13037
1826B
Lunatic Never Content
math
,
number theory
1100
x16363
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14729
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14334
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19404
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x127
1824D
LuoTianyi and the Function
data structures
3000
x466
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1271
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2521
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4396
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10978
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x803
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1206
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3719
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11868
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15587
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15914
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2354
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6687
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5740
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9969
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16150
1822C
Bun Lover
math
800
x22519
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24293
1822A
TubeTube Feed
brute force
,
implementation
800
x23846
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x723
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2291
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4828
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13817
1821B
Sort the Subarray
brute force
,
greedy
1100
x17479
1821A
Matching
combinatorics
,
math
800
x19522
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13786
1820A
Yura's New Name
implementation
,
strings
800
x16476
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x128
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x273
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x606
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1416
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3479
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