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Before contest
Codeforces Round 988 (Div. 3)
22:13:34
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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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Problems
#
Name
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x398
1051F
The Shortest Statement
graphs
,
shortest paths
,
trees
2400
x2963
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x976
1051D
Bicolorings
bitmasks
,
dp
1700
x7432
1051C
Vasya and Multisets
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9303
1051B
Relatively Prime Pairs
greedy
,
math
,
number theory
1000
x17226
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8428
1047B
Cover Points
geometry
,
math
900
x17304
1047A
Little C Loves 3 I
math
800
x19995
1046I
Say Hello
geometry
2300
x521
1046F
Splitting money
implementation
1400
x2795
1046C
Space Formula
greedy
1400
x3119
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x171
1045I
Palindrome Pairs
hashing
,
strings
1600
x4523
1045H
Self-exploration
math
2400
x377
1045G
AI robots
data structures
2200
x1687
1045F
Shady Lady
geometry
,
math
3400
x101
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x234
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x685
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x709
1045B
Space Isaac
hashing
,
number theory
2400
x520
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x540
1044F
DFS
data structures
2700
x579
1044E
Grid Sort
implementation
3100
x119
1044D
Deduction Queries
data structures
,
dsu
2400
x1014
1044C
Optimal Polygon Perimeter
dp
,
geometry
2100
x1353
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1578
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2910
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x238
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2413
1043E
Train Hard, Win Easy
constructive algorithms
,
greedy
,
math
,
sortings
1900
x2778
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4464
1043C
Smallest Word
constructive algorithms
,
greedy
,
implementation
1500
x6900
1043B
Lost Array
implementation
1200
x6293
1043A
Elections
implementation
,
math
800
x10821
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1316
1042E
Vasya and Magic Matrix
dp
,
math
,
probabilities
2300
x1795
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x6277
1042C
Array Product
constructive algorithms
,
greedy
,
math
1700
x4729
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x16260
1042A
Benches
binary search
,
implementation
1100
x12970
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1503
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3601
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x6006
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9524
1041B
Buying a TV Set
math
1000
x14064
1041A
Heist
greedy
,
implementation
,
sortings
800
x25226
1040B
Shashlik Cooking
dp
,
greedy
,
math
1300
x7111
1040A
Palindrome Dance
greedy
1000
x9583
1039E
Summer Oenothera Exhibition
data structures
3400
x272
1039D
You Are Given a Tree
data structures
,
dp
,
trees
2800
x1849
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1363
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2376
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x788
1038F
Wrap Around
dp
,
strings
2900
x348
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x988
1038D
Slime
dp
,
greedy
,
implementation
1800
x8414
1038C
Gambling
greedy
,
sortings
1300
x9440
1038B
Non-Coprime Partition
constructive algorithms
,
math
1100
x13644
1038A
Equality
implementation
,
strings
800
x14962
1037H
Security
data structures
,
string suffix structures
3200
x1040
1037G
A Game on Strings
games
3200
x310
1037F
Maximum Reduction
combinatorics
,
data structures
,
math
2500
x1149
1037E
Trips
graphs
2200
x2914
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x15003
1037C
Equalize
dp
,
greedy
,
strings
1300
x18932
1037B
Reach Median
greedy
1300
x10418
1037A
Packets
constructive algorithms
,
greedy
,
math
1300
x11220
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x381
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1615
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1659
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x9334
1036C
Classy Numbers
combinatorics
,
dp
1900
x9790
1036B
Diagonal Walking v.2
math
1600
x5720
1036A
Function Height
math
1000
x10179
1034E
Little C Loves 3 III
bitmasks
,
dp
,
math
3200
x642
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x456
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x885
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2156
1034A
Enlarge GCD
number theory
1800
x8792
1033G
Chip Game
games
3500
x387
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x392
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x653
1033D
Divisors
interactive
,
math
,
number theory
2000
x2405
1033C
Permutation Game
brute force
,
dp
,
games
1600
x5608
1033B
Square Difference
math
,
number theory
1100
x9902
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x13805
1032G
Chattering
2900
x466
1032F
Vasya and Maximum Matching
dp
,
trees
2400
x966
1032E
The Unbearable Lightness of Weights
dp
,
math
2100
x1692
1032D
Barcelonian Distance
geometry
,
implementation
1900
x2841
1032C
Playing Piano
constructive algorithms
,
dp
1700
x3984
1032B
Personalized Cup
1200
x5002
1032A
Kitchen Utensils
900
x6872
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x280
1031E
Triple Flips
constructive algorithms
2600
x533
1031D
Minimum path
greedy
1900
x2815
1031C
Cram Time
greedy
1600
x5328
1031B
Curiosity Has No Limits
1500
x3925
1031A
Golden Plate
implementation
,
math
800
x12912
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