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Before contest
Codeforces Round 941 (Div. 1)
3 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
3 days
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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
1268E
Happy Cactus
dp
3400
x219
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x224
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x226
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x229
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
1572F
Stations
data structures
3400
x236
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x245
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x249
1039E
Summer Oenothera Exhibition
data structures
3400
x263
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x274
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x312
794G
Replace All
combinatorics
,
dp
,
math
3400
x323
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x329
1276F
Asterisk Substrings
string suffix structures
3400
x333
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x335
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x341
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x355
1693E
Outermost Maximums
data structures
,
greedy
3400
x369
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x405
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x422
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x456
1097E
Egor and an RPG game
constructive algorithms
,
greedy
3400
x458
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x478
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x489
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x647
843D
Dynamic Shortest Path
graphs
,
shortest paths
3400
x750
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x759
1912C
Cactus Transformation
constructive algorithms
3300
x45
1666B
Budget Distribution
3300
x53
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
949F
Astronomy
geometry
,
probabilities
3300
x57
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x64
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
737F
Dirty plates
constructive algorithms
,
math
3300
x69
1938D
Bánh Bò
3300
x77
771F
Bear and Isomorphic Points
geometry
,
two pointers
3300
x78
901E
Cyclic Cipher
fft
,
math
3300
x84
1666A
Admissible Map
3300
x99
1381E
Origami
geometry
,
math
,
sortings
3300
x100
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x116
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x117
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x117
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x117
1266G
Permutation Concatenation
string suffix structures
3300
x117
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x118
868G
El Toll Caves
math
3300
x119
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x119
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x130
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x130
1530G
What a Reversal
constructive algorithms
3300
x132
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x135
1017H
The Films
brute force
3300
x137
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x142
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x147
1886F
Diamond Theft
data structures
,
greedy
3300
x158
725G
Messages on a Tree
3300
x161
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x162
1284G
Seollal
graphs
3300
x165
1804H
Code Lock
bitmasks
,
dp
3300
x168
1329E
Dreamoon Loves AA
binary search
,
greedy
3300
x169
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x197
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x199
1870G
MEXanization
data structures
3300
x201
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x201
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x202
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x202
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x205
1060H
Sophisticated Device
constructive algorithms
3300
x209
1500E
Subset Trick
binary search
,
data structures
3300
x210
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x214
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x216
1750G
Doping
combinatorics
,
dp
,
math
3300
x223
1188E
Problem from Red Panda
combinatorics
3300
x224
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x237
607E
Cross Sum
binary search
,
geometry
3300
x245
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x254
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x256
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x257
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x265
1083F
The Fair Nut and Amusing Xor
data structures
3300
x265
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x272
704E
Iron Man
data structures
,
geometry
,
trees
3300
x272
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x279
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x282
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x286
1172E
Nauuo and ODT
data structures
3300
x286
1322E
Median Mountain Range
data structures
3300
x293
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x295
1237H
Balanced Reversals
constructive algorithms
3300
x302
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x304
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x307
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x312
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x312
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x316
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x319
983D
Arkady and Rectangles
data structures
3300
x320
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