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Before contest
Codeforces Round 941 (Div. 1)
13:44:38
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
13:44:38
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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
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strings
ternary search
trees
two pointers
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Problems
#
Name
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x39
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1930I
Counting Is Fun
combinatorics
3500
x49
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x52
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x56
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x69
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x73
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x75
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x76
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x109
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x116
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x122
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x129
1810H
Last Number
combinatorics
,
math
2900
x129
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x130
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x130
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x150
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x152
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x156
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x162
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x169
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x170
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x176
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x180
44I
Toys
brute force
,
combinatorics
2300
x181
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x183
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
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x200
1952E
Sweep Line
combinatorics
,
games
,
math
x201
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x201
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x202
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x206
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x211
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x223
1750G
Doping
combinatorics
,
dp
,
math
3300
x224
1188E
Problem from Red Panda
combinatorics
3300
x224
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x226
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x237
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x245
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x252
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x259
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
1205E
Expected Value Again
combinatorics
,
strings
3100
x262
135E
Weak Subsequence
combinatorics
3000
x263
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x264
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x266
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x268
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x272
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x280
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x282
1605F
PalindORme
combinatorics
,
dp
2900
x284
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x285
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x291
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x299
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x300
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x310
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x313
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x314
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x319
794G
Replace All
combinatorics
,
dp
,
math
3400
x323
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x328
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x332
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x337
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x341
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x345
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x347
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x350
1279E
New Year Permutations
combinatorics
,
dp
2700
x354
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x363
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x363
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x363
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x365
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x366
1089I
Interval-Free Permutations
combinatorics
2600
x367
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x370
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x372
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x373
212C
Cowboys
combinatorics
,
dp
,
math
2100
x376
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x379
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x384
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x387
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x388
201E
Thoroughly Bureaucratic Organization
binary search
,
combinatorics
2600
x391
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x399
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
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
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x417
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x420
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x423
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x424
698F
Coprime Permutation
combinatorics
,
number theory
3000
x428
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