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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
30:39:57
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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
#
Name
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x716
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1741
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x5017
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x14073
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x8015
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x10868
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x18221
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x20697
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x27383
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x29205
1829B
Blank Space
implementation
800
x48655
1829A
Love Story
implementation
,
strings
800
x53443
1828B
Permutation Swap
math
,
number theory
900
x24405
1828A
Divisible Array
constructive algorithms
,
math
800
x23922
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x118
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x426
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x776
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1263
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1930
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3969
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x19706
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x399
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1670
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x10405
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13869
1826B
Lunatic Never Content
math
,
number theory
1100
x18470
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x15533
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14869
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19819
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x136
1824D
LuoTianyi and the Function
data structures
3000
x501
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1452
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2782
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4738
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x11467
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x912
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1279
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3926
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x12575
1823B
Sort with Step
brute force
,
math
,
sortings
900
x16405
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x16413
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2481
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x7254
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x6346
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10742
1822D
Super-Permutation
constructive algorithms
,
math
1200
x17071
1822C
Bun Lover
math
800
x23285
1822B
Karina and Array
greedy
,
math
,
sortings
800
x25228
1822A
TubeTube Feed
brute force
,
implementation
800
x24750
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x774
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2422
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x5067
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14557
1821B
Sort the Subarray
brute force
,
greedy
1100
x19308
1821A
Matching
combinatorics
,
math
800
x20079
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x15305
1820A
Yura's New Name
implementation
,
strings
800
x16850
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x134
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x317
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x683
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1516
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3659
1819A
Constructive Problem
brute force
,
greedy
1300
x12951
1818B
Indivisible
constructive algorithms
900
x15275
1818A
Politics
greedy
,
implementation
800
x13152
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x213
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x266
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x811
1817C
Similar Polynomials
combinatorics
,
math
2400
x1023
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x4233
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x11272
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x15477
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17728
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x241
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x349
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1207
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x2024
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3101
1815A
Ian and Array Sorting
greedy
,
math
1300
x14407
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x653
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1394
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x889
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x11079
1814B
Long Legs
brute force
,
math
1700
x10230
1814A
Coins
implementation
,
math
800
x30528
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5989
1812I
Mountain Climber
*special problem
x270
1812H
Expected Twist
*special problem
,
interactive
x151
1812G
Colour Vision
*special problem
,
implementation
x555
1812F
Factorization
*special problem
,
number theory
x1265
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x4059
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4675
1812C
Digits
*special problem
x1278
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5745
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13432
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1810
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x2124
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1882
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x12654
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7683
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