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Before contest
Codeforces Round 941 (Div. 1)
19:02:03
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Before contest
Codeforces Round 941 (Div. 2)
19:02:03
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data structures
combine-tags-by-or
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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
1878D
Reverse Madness
data structures
,
greedy
1600
x7529
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x116
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x215
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x11805
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x77
1870G
MEXanization
data structures
3300
x201
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10680
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x68
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10499
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x403
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1498
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x112
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1306
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2459
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6307
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2628
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x9514
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19556
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9408
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1292
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x12346
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x365
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6508
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x998
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1241
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2681
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x10337
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x10971
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x97
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x157
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1445
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2903
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x11130
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x639
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1491
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9774
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13282
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x850
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3589
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x17871
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7284
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x129
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x367
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1464
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4957
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10897
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1524
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x1873
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4115
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7486
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2166
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3060
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2056
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2043
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4335
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6621
1830F
The Third Grace
data structures
,
dp
3200
x219
1830E
Bully Sort
data structures
,
math
3500
x225
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9324
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x106
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x696
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1132
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1755
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1493
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
1824D
LuoTianyi and the Function
data structures
3000
x449
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1240
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2289
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6452
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x126
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x593
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10273
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1232
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x817
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1608
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x533
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2958
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x703
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2148
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17778
1807D
Odd Queries
data structures
,
implementation
900
x28464
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2671
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1519
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x11974
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x336
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2032
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3199
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5774
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21593
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21235
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22285
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2251
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11344
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15846
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1179
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