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Codeforces Round 940 (Div. 2) and CodeCraft-23
3 days
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*has extra registration
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Difficulty:
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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
string suffix structures
strings
ternary search
trees
two pointers
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Problems
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Status
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Custom test
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
x48
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x52
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x55
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x68
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x72
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x72
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x75
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x107
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x112
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x120
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x126
1810H
Last Number
combinatorics
,
math
2900
x128
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x129
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x129
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x136
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x139
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x141
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x149
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x154
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x161
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x161
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x168
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x168
44I
Toys
brute force
,
combinatorics
2300
x180
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x181
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x188
1952E
Sweep Line
combinatorics
,
games
,
math
x193
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x194
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x196
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x198
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x200
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x201
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x210
1750G
Doping
combinatorics
,
dp
,
math
3300
x222
1188E
Problem from Red Panda
combinatorics
3300
x223
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x225
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x236
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x241
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x241
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x250
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x255
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x258
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x260
1205E
Expected Value Again
combinatorics
,
strings
3100
x261
135E
Weak Subsequence
combinatorics
3000
x261
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x262
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x264
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x271
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x278
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x278
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x280
1605F
PalindORme
combinatorics
,
dp
2900
x283
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x289
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x295
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x297
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x309
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x311
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x313
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x318
794G
Replace All
combinatorics
,
dp
,
math
3400
x318
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x326
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x330
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x334
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x336
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x340
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x342
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x344
1279E
New Year Permutations
combinatorics
,
dp
2700
x353
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x357
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x359
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x360
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x362
1089I
Interval-Free Permutations
combinatorics
2600
x365
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x365
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x369
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x370
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x372
212C
Cowboys
combinatorics
,
dp
,
math
2100
x375
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x377
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x380
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x386
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x386
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x387
201E
Thoroughly Bureaucratic Organization
binary search
,
combinatorics
2600
x387
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x393
1809G
Prediction
combinatorics
,
dp
,
math
2800
x405
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x406
747F
Igor and Interesting Numbers
brute force
,
combinatorics
,
dp
,
math
2500
x408
380D
Sereja and Cinema
combinatorics
,
math
2500
x408
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x409
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x410
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x416
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x417
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x421
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x423
698F
Coprime Permutation
combinatorics
,
number theory
3000
x427
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