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Codeforces Round 941 (Div. 1)
3 days
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Before contest
Codeforces Round 941 (Div. 2)
3 days
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2-sat
binary search
bitmasks
brute force
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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
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number theory
probabilities
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Problems
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Name
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x395
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x398
1326F2
Wise Men (Hard Version)
bitmasks
,
dp
,
math
3200
x456
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x480
1119H
Triple
fft
,
math
3200
x507
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x528
1034E
Little C Loves 3 III
bitmasks
,
dp
,
math
3200
x585
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x607
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x622
1349D
Slime and Biscuits
math
,
probabilities
3200
x802
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x850
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x31
1425C
Captain of Knights
math
3100
x37
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x102
1912F
Fugitive Frenzy
math
,
probabilities
3100
x104
269E
String Theory
geometry
,
math
,
strings
3100
x107
446E
DZY Loves Bridges
math
,
matrices
3100
x118
1666G
Global Warming
geometry
,
math
3100
x133
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x136
329E
Evil
math
3100
x163
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x174
1761F1
Anti-median (Easy Version)
dp
,
math
3100
x197
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x219
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x232
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x264
1012E
Cycle sort
dsu
,
math
3100
x268
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x272
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x305
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x319
986D
Perfect Encoding
fft
,
math
3100
x321
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x322
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x351
1168E
Xor Permutations
constructive algorithms
,
math
3100
x353
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x370
1349F1
Slime and Sequences (Easy Version)
dp
,
fft
,
math
3100
x397
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x435
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x441
516E
Drazil and His Happy Friends
math
,
number theory
3100
x471
963E
Circles of Waiting
math
3100
x500
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x513
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x517
1463F
Max Correct Set
bitmasks
,
dp
,
math
3100
x550
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x555
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x591
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x597
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x714
708E
Student's Camp
dp
,
math
3100
x923
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x81
859G
Circle of Numbers
math
3000
x144
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x167
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x196
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x239
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
346E
Doodle Jump
math
,
number theory
3000
x249
57E
Chess
math
,
shortest paths
3000
x249
1874E
Jellyfish and Hack
dp
,
math
3000
x265
303E
Random Ranking
dp
,
math
,
probabilities
3000
x310
1411F
The Thorny Path
greedy
,
math
3000
x319
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x329
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x352
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x361
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x378
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x397
1583G
Omkar and Time Travel
data structures
,
math
3000
x399
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x414
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x452
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x458
889E
Mod Mod Mod
binary search
,
dp
,
math
3000
x513
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x555
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x577
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x620
1267G
Game Relics
math
,
probabilities
3000
x625
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x667
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x778
891E
Lust
combinatorics
,
math
,
matrices
3000
x840
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1148
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2043
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x95
128E
Birthday
geometry
,
math
2900
x96
1575F
Finding Expected Value
math
2900
x107
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x117
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
79E
Security System
math
2900
x118
1810H
Last Number
combinatorics
,
math
2900
x129
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x167
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x182
1765J
Hero to Zero
graph matchings
,
math
2900
x185
1280E
Kirchhoff's Current Loss
math
2900
x194
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x205
497D
Gears
brute force
,
geometry
,
math
2900
x223
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x245
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x264
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x280
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x281
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x300
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x306
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x310
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
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