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Codeforces Round (Div. 2)
3 days
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data structures
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
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1943
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x83
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x66
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x10418
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x24175
1906F
Maximize The Value
data structures
,
sortings
2100
x972
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x482
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3620
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x320
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x863
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x4037
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11445
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x583
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x932
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x4022
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3825
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x268
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2998
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2126
1896E
Permutation Sorting
data structures
,
sortings
2100
x2091
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5404
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x180
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1498
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5730
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x843
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3492
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x70
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x917
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3107
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x839
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1626
1886F
Diamond Theft
data structures
,
greedy
3300
x162
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3406
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5709
1883F
You Are So Beautiful
data structures
1400
x8758
1883D
In Love
data structures
,
greedy
1500
x10618
1881G
Anya and the Mysterious String
binary search
,
data structures
2000
x2232
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x479
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1130
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11766
1878D
Reverse Madness
data structures
,
greedy
1600
x7894
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x119
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x261
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12629
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x80
1870G
MEXanization
data structures
3300
x206
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11060
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x71
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10845
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x416
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1549
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x130
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1354
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2505
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6502
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2740
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x10141
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x20083
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9722
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x266
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1338
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x12776
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x381
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6707
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1021
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1268
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2739
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x10820
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x11584
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x102
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x162
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1484
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3075
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x11684
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x680
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1559
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x10110
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13983
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x865
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3657
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x18339
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7510
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x133
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x674
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x377
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1514
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x5103
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11507
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1561
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x1927
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4229
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7756
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2232
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3128
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2111
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2115
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4475
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6966
1830F
The Third Grace
data structures
,
dp
3200
x237
1830E
Bully Sort
data structures
,
math
3500
x235
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