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Before contest
Codeforces Round 941 (Div. 1)
09:19:25
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
09:19:24
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dp
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
1773L
Lisa's Sequences
dp
3500
x28
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x54
1776E
Crossing the Railways
data structures
,
dp
3500
x61
1517H
Fly Around the World
dp
,
geometry
3500
x64
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x68
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x69
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x69
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x70
1874G
Jellyfish and Inscryption
dp
3500
x71
1863H
Goldberg Machine 3
dp
,
trees
3500
x71
1943F
Minimum Hamming Distance
dp
3500
x72
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x72
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x72
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x74
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x76
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x79
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x81
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x85
1677F
Tokitsukaze and Gems
dp
,
math
3500
x85
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1322F
Assigning Fares
dp
,
trees
3500
x88
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x97
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x102
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x107
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x107
1854F
Mark and Spaceship
brute force
,
dp
3500
x110
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x119
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x123
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x127
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x143
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x144
1874F
Jellyfish and OEIS
dp
3500
x152
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x152
1210G
Mateusz and Escape Room
dp
3500
x155
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x177
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x182
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x201
1450G
Communism
bitmasks
,
dp
,
trees
3500
x231
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x234
1523H
Hopping Around the Array
data structures
,
dp
3500
x234
1456E
XOR-ranges
dp
,
greedy
3500
x268
1110H
Modest Substrings
dp
,
strings
3500
x273
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x299
1500F
Cupboards Jumps
dp
3500
x328
1290F
Making Shapes
dp
3500
x352
1158F
Density of subarrays
dp
,
math
3500
x391
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x938
1431J
Zero-XOR Array
*special problem
,
dp
3400
x42
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x92
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x99
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x129
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
1530H
Turing's Award
data structures
,
dp
3400
x140
1012F
Passports
dp
,
implementation
3400
x152
1007E
Mini Metro
dp
3400
x158
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x195
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x200
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x210
1268E
Happy Cactus
dp
3400
x219
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x226
794G
Replace All
combinatorics
,
dp
,
math
3400
x323
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x647
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x118
1804H
Code Lock
bitmasks
,
dp
3300
x168
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x197
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x199
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x215
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x216
1750G
Doping
combinatorics
,
dp
,
math
3300
x224
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x259
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x280
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x327
713E
Sonya Partymaker
binary search
,
dp
3300
x340
1523F
Favorite Game
bitmasks
,
dp
3300
x394
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x427
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x471
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x514
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x526
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x605
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x796
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1776K
Uniform Chemistry
dp
,
math
3200
x64
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
1510H
Hard Optimization
dp
3200
x95
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x103
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x110
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x150
924F
Minimal Subset Difference
dp
3200
x157
1408I
Bitwise Magic
dp
,
math
3200
x165
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x170
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x179
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x185
1830F
The Third Grace
data structures
,
dp
3200
x219
1832F
Zombies
binary search
,
dp
3200
x250
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x267
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