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Codeforces Round (Div. 4)
41:13:13
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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
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x9525
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13411
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4513
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x11166
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3790
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x12155
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6943
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x6048
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10318
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4930
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14151
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3533
1819A
Constructive Problem
brute force
,
greedy
1300
x12569
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x4070
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10891
1815A
Ian and Array Sorting
greedy
,
math
1300
x13980
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10683
1814B
Long Legs
brute force
,
math
1700
x9917
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x12154
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7400
1810D
Climbing the Tree
binary search
,
math
1700
x7372
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14396
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x6219
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12605
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3746
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6177
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12724
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7513
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6435
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12414
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11986
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3383
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x6151
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8470
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3846
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12644
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12681
1799D1
Hot Start Up (easy version)
dp
1900
x4407
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5756
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9678
1798C
Candy Store
greedy
,
math
,
number theory
1700
x8089
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3904
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7542
1796C
Maximum Set
binary search
,
math
1600
x10269
1795D
Triangle Coloring
combinatorics
,
math
1600
x8997
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x12218
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3527
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x13522
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x6041
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6199
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13948
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4725
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x12252
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14948
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8450
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x17065
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3373
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x7004
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8905
1784B
Letter Exchange
constructive algorithms
1900
x3297
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x9224
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5450
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7501
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4864
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7824
1779C
Least Prefix Sum
data structures
,
greedy
1600
x12287
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x8102
1778B
The Forbidden Permutation
greedy
,
math
1300
x13222
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3430
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x8405
1776L
Controllers
binary search
,
math
1500
x5840
1776H
Beppa and SwerChat
two pointers
1300
x6300
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3392
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x6153
1775C
Interesting Sequence
bitmasks
,
math
1600
x10292
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x13634
1774E
Two Chess Pieces
dfs and similar
,
dp
,
greedy
,
trees
1900
x3448
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7760
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11925
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x12123
1773K
King's Puzzle
constructive algorithms
1900
x1404
1773E
Easy Assembly
greedy
,
sortings
1400
x4819
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1524
1772E
Permutation Game
games
1700
x6706
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x15743
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x9542
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x14082
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8489
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x375
1769C2
Подкрутка II
*special problem
,
dp
1300
x953
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x868
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x7048
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x14076
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9795
1766D
Lucky Chains
math
,
number theory
1600
x8811
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13494
1765N
Number Reduction
greedy
1500
x4691
1765K
Torus Path
greedy
,
math
1500
x5735
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4102
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9336
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