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Before contest
Codeforces Round 941 (Div. 1)
20:34:28
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Before contest
Codeforces Round 941 (Div. 2)
20:34:28
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math
combine-tags-by-or
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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
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number theory
probabilities
schedules
shortest paths
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ternary search
trees
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Problems
#
Name
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x319
1411F
The Thorny Path
greedy
,
math
3000
x319
683D
Chocolate Bar
*special problem
,
math
1400
x319
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x320
986D
Perfect Encoding
fft
,
math
3100
x322
73E
Morrowindows
math
,
number theory
2400
x322
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x323
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x323
794G
Replace All
combinatorics
,
dp
,
math
3400
x323
180B
Divisibility Rules
math
,
number theory
2300
x325
23D
Tetragon
geometry
,
math
2600
x325
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x327
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x329
57D
Journey
dp
,
math
2500
x329
117D
Not Quick Transformation
divide and conquer
,
math
2500
x330
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x331
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x332
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x332
93D
Flags
dp
,
math
,
matrices
2500
x333
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x334
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x334
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x336
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x336
603D
Ruminations on Ruminants
geometry
,
math
2900
x337
1081G
Mergesort Strikes Back
math
,
probabilities
3200
x338
100I
Rotation
*special problem
,
geometry
,
math
1500
x338
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x341
50E
Square Equation Roots
math
2300
x341
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x346
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x349
883D
Packmen Strike Back
binary search
,
dp
,
math
2500
x349
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x350
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x350
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x351
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x353
1168E
Xor Permutations
constructive algorithms
,
math
3100
x353
461D
Appleman and Complicated Task
dsu
,
math
2800
x355
209B
Pixels
constructive algorithms
,
math
2100
x355
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x357
1423F
Coins
math
2700
x360
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x362
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x364
852A
Digits
brute force
,
implementation
,
math
2500
x364
1045H
Self-exploration
math
2400
x365
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x366
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x367
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x368
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x368
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x370
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x373
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x373
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x374
212C
Cowboys
combinatorics
,
dp
,
math
2100
x376
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x378
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x378
185D
Visit of the Great
math
,
number theory
2600
x378
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x379
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x379
316E2
Summer Homework
data structures
,
math
2300
x380
332D
Theft of Blueprints
graphs
,
math
2400
x381
42D
Strange town
constructive algorithms
,
math
2300
x385
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x387
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x388
1210E
Wojtek and Card Tricks
math
2700
x389
1158F
Density of subarrays
dp
,
math
3500
x391
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x393
60D
Savior
brute force
,
dsu
,
math
2500
x394
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x395
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x397
1349F1
Slime and Sequences (Easy Version)
dp
,
fft
,
math
3100
x397
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x397
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x399
1583G
Omkar and Time Travel
data structures
,
math
3000
x400
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x401
930E
Coins Exhibition
data structures
,
dp
,
math
2900
x404
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x405
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x406
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x406
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x409
747F
Igor and Interesting Numbers
brute force
,
combinatorics
,
dp
,
math
2500
x409
380D
Sereja and Cinema
combinatorics
,
math
2500
x409
1809G
Prediction
combinatorics
,
dp
,
math
2800
x410
95D
Horse Races
dp
,
math
2500
x413
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x414
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x414
154D
Flatland Fencing
games
,
math
2400
x415
1918G
Permutation of Given
constructive algorithms
,
math
2700
x417
717H
Pokermon League challenge
math
,
probabilities
2400
x417
1063D
Candies for Children
brute force
,
math
2600
x418
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x420
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x421
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x427
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x429
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x432
93E
Lostborn
dp
,
math
,
number theory
2600
x433
188C
LCM
*special problem
,
implementation
,
math
1400
x434
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x435
388D
Fox and Perfect Sets
math
2700
x435
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