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Educational Codeforces Round 169 (Rated for Div. 2)
19:17:35
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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
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x12129
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5477
1903C
Theofanis' Nightmare
constructive algorithms
,
greedy
1400
x11433
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x13269
1901D
Yet Another Monster Fight
binary search
,
dp
,
greedy
,
implementation
,
math
1700
x6665
1901C
Add, Divide and Floor
constructive algorithms
,
greedy
,
math
1400
x11576
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x11171
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x7297
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x14997
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x13161
1898C
Colorful Grid
constructive algorithms
1700
x5282
1898B
Milena and Admirer
greedy
,
math
1500
x11446
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5546
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x9310
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10735
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8623
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x12000
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x12656
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x7160
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x12798
1886C
Decreasing String
implementation
,
strings
1600
x11098
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5902
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x10356
1883F
You Are So Beautiful
data structures
1400
x9138
1883E
Look Back
bitmasks
,
greedy
1700
x7804
1883D
In Love
data structures
,
greedy
1500
x11060
1882C
Card Game
brute force
,
greedy
1500
x12011
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x15126
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6603
1881E
Block Sequence
dp
1500
x13306
1881D
Divide and Equalize
math
,
number theory
1300
x16320
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x7146
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x16300
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x12227
1878D
Reverse Madness
data structures
,
greedy
1600
x8084
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x8021
1875D
Jellyfish and Mex
dp
1600
x8308
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11396
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x7138
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x12766
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14942
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x13053
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11253
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6828
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x11762
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x11037
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7581
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6589
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x13198
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x9338
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x10408
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x16830
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9904
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x13071
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x11116
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x11151
1857E
Power of Points
math
,
sortings
1500
x12129
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x18927
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x11948
1854A1
Dual (Easy Version)
constructive algorithms
,
math
1400
x13847
1851E
Nastya and Potions
dfs and similar
,
dp
,
graphs
,
sortings
1500
x10062
1851D
Prefix Permutation Sums
implementation
,
math
1300
x14954
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x8008
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x12013
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x18462
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x8275
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x10320
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12670
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x16384
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13965
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x12131
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x15385
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11893
1842C
Tenzing and Balls
dp
1500
x12432
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7883
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x13491
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11763
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x14161
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x14334
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7684
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x7142
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x11360
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x13155
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x13222
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7531
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x10091
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x17132
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x9371
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13309
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x11109
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x12081
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6896
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5978
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10249
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14080
1819A
Constructive Problem
brute force
,
greedy
1300
x12492
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10807
1815A
Ian and Array Sorting
greedy
,
math
1300
x13887
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10620
1814B
Long Legs
brute force
,
math
1700
x9868
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