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Codeforces Round 974 (Div. 3)
13:58:09
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Difficulty:
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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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Custom test
Problems
#
Name
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x11893
930E
Coins Exhibition
data structures
,
dp
,
math
2900
x431
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x404
930C
Teodor is not a liar!
data structures
,
dp
1900
x2116
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2650
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x7089
929D
Пограничные врата
2400
x152
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1151
929B
Места в самолёте
*special problem
,
implementation
1300
x2041
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2496
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x806
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x885
928B
Chat
*special problem
,
dp
1400
x2530
928A
Login Verification
*special problem
,
strings
1200
x3381
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
926J
Segments
data structures
2100
x384
926I
A Vital Problem
1700
x659
926H
Endless Roses Most Beautiful
2200
x214
926G
Large Bouquets
1500
x1472
926F
Mobile Communications
2000
x227
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x926
926D
Choose Place
1600
x911
926C
Is This a Zebra?
implementation
1700
x1881
926B
Add Points
math
,
number theory
1800
x1664
926A
2-3-numbers
implementation
,
math
1300
x3745
925F
Parametric Circulation
binary search
,
flows
3100
x112
925E
May Holidays
data structures
,
trees
2900
x392
925D
Aztec Catacombs
constructive algorithms
2600
x520
925C
Big Secret
constructive algorithms
,
math
2200
x1304
925B
Resource Distribution
binary search
,
implementation
,
sortings
1700
x2201
925A
Stairs and Elevators
binary search
1600
x3452
924F
Minimal Subset Difference
dp
3200
x207
924E
Wardrobe
dp
,
greedy
2700
x516
924D
Contact ATC
2500
x861
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3824
924B
Three-level Laser
binary search
,
greedy
,
two pointers
1600
x5264
924A
Mystical Mosaic
greedy
,
implementation
1300
x5040
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x75
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x452
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1191
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4263
923B
Producing Snow
binary search
,
data structures
1600
x7296
923A
Primal Sport
math
,
number theory
1700
x5018
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x640
922E
Birds
dp
2200
x2109
922D
Robot Vacuum Cleaner
greedy
,
sortings
1800
x4350
922C
Cave Painting
brute force
,
number theory
1600
x7015
922B
Magic Forest
brute force
1300
x8459
922A
Cloning Toys
implementation
1300
x11513
92114
Labyrinth-14
3200
92113
Labyrinth-13
3200
92112
Labyrinth-12
3200
92111
Labyrinth-11
3200
92110
Labyrinth-10
3200
92109
Labyrinth-9
3200
92108
Labyrinth-8
3200
92107
Labyrinth-7
3200
92106
Labyrinth-6
3200
92105
Labyrinth-5
3200
92104
Labyrinth-4
3200
92103
Labyrinth-3
3200
92102
Labyrinth-2
3200
92101
Labyrinth-1
3200
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1741
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6678
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x6286
920D
Tanks
dp
,
greedy
,
implementation
2400
x708
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9158
920B
Tea Queue
implementation
1200
x7291
920A
Water The Garden
implementation
1000
x7706
919F
A Game With Numbers
games
,
graphs
,
shortest paths
2600
x335
919E
Congruence Equation
chinese remainder theorem
,
math
,
number theory
2100
x2097
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x9867
919C
Seat Arrangements
brute force
,
implementation
1300
x8960
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x27974
919A
Supermarket
brute force
,
greedy
,
implementation
800
x16091
918B
Radio Station
implementation
,
strings
900
x16332
918A
Eleven
brute force
,
implementation
800
x16993
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x133
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1135
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x390
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3527
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3507
916E
Jamie and Tree
data structures
,
trees
2400
x1651
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x509
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x5085
916B
Jamie and Binary Sequence (changed after round)
bitmasks
,
greedy
,
math
2000
x1899
916A
Jamie and Alarm Snooze
brute force
,
implementation
,
math
900
x8579
915G
Coprime Arrays
math
,
number theory
2300
x1218
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2450
915E
Physical Education Lessons
data structures
,
implementation
,
sortings
2300
x4321
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x3414
915C
Permute Digits
dp
,
greedy
1700
x7009
915B
Browser
implementation
1300
x7722
915A
Garden
implementation
900
x14643
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x237
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x925
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1621
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1482
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5264
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