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Codeforces Round 937 (Div. 4)
00:51:46
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math
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
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4030
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1153
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10011
1437A
Marketing Scheme
brute force
,
constructive algorithms
,
greedy
,
math
800
x17798
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x478
1436B
Prime Square
constructive algorithms
,
math
900
x20106
1436A
Reorder
math
800
x22347
1433E
Two Round Dances
combinatorics
,
math
1300
x17916
1433A
Boring Apartments
implementation
,
math
800
x48607
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x597
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23109
1430A
Number of Apartments
brute force
,
constructive algorithms
,
math
900
x20382
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3468
1428A
Box is Pull
math
800
x16126
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1250
1427A
Avoiding Zero
math
,
sortings
900
x16760
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7177
1426C
Increase and Copy
binary search
,
constructive algorithms
,
math
1100
x18940
1426A
Floor Number
implementation
,
math
800
x44917
1425D
Danger of Mad Snakes
combinatorics
,
dp
,
math
2300
x791
1425C
Captain of Knights
math
3100
x36
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4621
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x718
1423F
Coins
math
2700
x355
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x949
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8034
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14123
1422A
Fence
geometry
,
math
800
x20574
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4039
1421A
XORwice
bitmasks
,
greedy
,
math
800
x26683
1420B
Rock and Lever
bitmasks
,
math
1200
x23076
1420A
Cubes Sorting
math
,
sortings
900
x22715
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3116
1419C
Killjoy
greedy
,
implementation
,
math
1500
x14798
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15907
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x346
1418A
Buying Torches
math
1000
x20930
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14295
1417A
Copy-paste
greedy
,
math
800
x18019
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4131
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5869
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2558
1415A
Prison Break
brute force
,
math
800
x14892
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x1898
1413A
Finding Sasuke
constructive algorithms
,
math
800
x14563
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x569
1411F
The Thorny Path
greedy
,
math
3000
x314
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1545
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x18500
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22629
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x28063
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x61593
1408I
Bitwise Magic
dp
,
math
3200
x163
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8578
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9711
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11309
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16621
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20005
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1500
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3336
1406A
Subset Mex
greedy
,
implementation
,
math
900
x20828
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x975
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1122
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8791
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23267
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x20684
1401A
Distance and Axis
constructive algorithms
,
math
900
x26779
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x880
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9715
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x10797
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x752
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2159
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x23738
1398A
Bad Triangle
geometry
,
math
800
x26889
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14266
1395A
Boboniu Likes to Color Balls
brute force
,
math
1000
x23323
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10216
1393A
Rainbow Dash, Fluttershy and Chess Coloring
greedy
,
math
800
x20175
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x201
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x655
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x434
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1917
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3211
1392B
Omkar and Infinity Clock
implementation
,
math
800
x18298
1392A
Omkar and Password
greedy
,
math
800
x20070
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14483
1391A
Suborrays
constructive algorithms
,
math
800
x23949
1389E
Calendar Ambiguity
math
,
number theory
2200
x3091
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4004
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x37873
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9293
1388B
Captain Flint and a Long Voyage
greedy
,
math
1000
x21823
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24484
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x663
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x116
1385A
Three Pairwise Maximums
math
800
x37225
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4723
1381E
Origami
geometry
,
math
,
sortings
3300
x98
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x760
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