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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 174 (Rated for Div. 2)
24:55:34
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Difficulty:
—
combinatorics
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
2029H
Message Spread
bitmasks
,
brute force
,
combinatorics
,
dp
3500
x72
2062H
Galaxy Generator
bitmasks
,
combinatorics
,
dp
3500
x75
1930I
Counting Is Fun
combinatorics
3500
x76
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x84
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x85
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x95
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x126
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x126
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x145
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x172
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x206
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x209
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x238
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x251
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x325
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x364
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x714
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x67
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x151
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x166
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x198
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x213
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x223
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x245
794G
Replace All
combinatorics
,
dp
,
math
3400
x353
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x364
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x140
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x146
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x181
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x212
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x240
1188E
Problem from Red Panda
combinatorics
3300
x256
1750G
Doping
combinatorics
,
dp
,
math
3300
x261
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x279
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x296
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x333
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x354
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x564
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x590
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x54
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x187
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x190
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x314
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x456
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x470
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x486
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x500
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x654
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x956
2030G2
The Destruction of the Universe (Hard Version)
combinatorics
,
math
3100
x132
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x238
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x275
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x276
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x287
1205E
Expected Value Again
combinatorics
,
strings
3100
x291
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x352
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x358
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x398
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x455
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x575
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x729
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x756
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1933
2056F2
Xor of Median (Hard Version)
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
3000
x147
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x179
1988F
Heartbeat
combinatorics
,
dp
,
fft
,
math
3000
x251
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x265
135E
Weak Subsequence
combinatorics
3000
x314
698F
Coprime Permutation
combinatorics
,
number theory
3000
x446
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x471
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x696
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x699
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x776
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x803
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x830
891E
Lust
combinatorics
,
math
,
matrices
3000
x970
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x1008
1810H
Last Number
combinatorics
,
math
2900
x147
2030G1
The Destruction of the Universe (Easy Version)
combinatorics
,
greedy
,
math
2900
x180
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
dp
,
trees
2900
x235
2018F1
Speedbreaker Counting (Easy Version)
combinatorics
,
dp
,
greedy
,
math
2900
x236
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x252
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x253
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x283
1605F
PalindORme
combinatorics
,
dp
2900
x320
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x334
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x336
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x342
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x343
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x382
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x398
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x408
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x415
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x455
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x457
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x472
1747E
List Generation
combinatorics
,
dp
,
math
2900
x531
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x536
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x541
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x550
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