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Before contest
Codeforces Round 988 (Div. 3)
42:45:31
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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
578A
A Problem about Polyline
geometry
,
math
1700
x4772
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x12321
576E
Painting Edges
binary search
,
data structures
3300
x1239
576D
Flights for Regular Customers
dp
,
matrices
2700
x1417
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x3481
576B
Invariance of Tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2100
x1813
576A
Vasya and Petya's Game
math
,
number theory
1500
x14025
575I
Robots protection
data structures
2800
x466
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1692
575G
Run for beer
dfs and similar
,
shortest paths
2200
x893
575F
Bulbo
dp
,
greedy
2100
x1038
575E
Spectator Riots
geometry
2800
x288
575D
Tablecity
constructive algorithms
,
implementation
1700
x1877
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x223
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1078
575A
Fibonotci
data structures
,
math
,
matrices
2700
x808
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7824
573E
Bear and Bowling
data structures
,
greedy
3200
x1757
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x566
573C
Bear and Drawing
constructive algorithms
,
dfs and similar
,
trees
2300
x971
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5949
571E
Geometric Progressions
math
3200
x269
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x682
571C
CNF 2
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x669
571B
Minimization
dp
,
greedy
,
sortings
2000
x2655
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2330
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1909
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x7312
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9185
569A
Music
implementation
,
math
1500
x4814
568E
Longest Increasing Subsequence
data structures
,
dp
3000
x598
568D
Sign Posts
brute force
,
geometry
,
math
2800
x308
568C
New Language
2-sat
,
greedy
2600
x867
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2250
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5116
567F
Mausoleum
dp
2400
x586
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1769
567D
One-Dimensional Battle Ships
binary search
,
data structures
,
greedy
,
sortings
1700
x4815
567C
Geometric Progression
binary search
,
data structures
,
dp
1700
x9515
566G
Max and Min
geometry
2500
x336
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3648
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x637
566D
Restructuring Company
data structures
,
dsu
1900
x3292
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x763
566B
Replicating Processes
constructive algorithms
,
greedy
2600
x273
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x921
559E
Gerald and Path
dp
,
sortings
3000
x944
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x441
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6560
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10695
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10466
558E
A Simple Task
data structures
,
sortings
,
strings
2300
x6142
558D
Guess Your Way Out! II
data structures
,
implementation
,
sortings
2300
x1150
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3994
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1089
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2211
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x4024
557B
Pasha and Tea
constructive algorithms
,
implementation
,
math
,
sortings
1500
x7200
555E
Case of Computer Network
dfs and similar
,
graphs
,
trees
2800
x2401
555D
Case of a Top Secret
binary search
,
implementation
,
math
2500
x873
555C
Case of Chocolate
data structures
2200
x1969
555B
Case of Fugitive
data structures
,
greedy
,
sortings
2000
x3750
555A
Case of Matryoshkas
implementation
1500
x6549
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x557
553D
Nudist Beach
binary search
,
graphs
,
greedy
2300
x1002
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1812
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2120
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8704
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1630
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4492
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5492
551E
GukiZ and GukiZiana
binary search
,
data structures
,
implementation
2500
x1873
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1967
551C
GukiZ hates Boxes
binary search
,
greedy
2200
x3596
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3861
550E
Brackets in Implications
constructive algorithms
,
greedy
,
implementation
,
math
2200
x1396
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3480
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x28853
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x21591
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x38235
549H
Degenerate Matrix
binary search
,
math
2100
x1993
549G
Happy Line
constructive algorithms
,
greedy
,
sortings
2200
x2453
549F
Yura and Developers
data structures
,
divide and conquer
2800
x888
549E
Sasha Circle
geometry
,
math
2700
x155
549D
Haar Features
greedy
,
implementation
1900
x2141
549C
The Game Of Parity
games
2200
x1738
549B
Looksery Party
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2300
x1503
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8466
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x2114
547D
Mike and Fish
constructive algorithms
,
dfs and similar
,
graphs
2600
x2630
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2887
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8812
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2595
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3661
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11957
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17689
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4678
545C
Woodcutters
dp
,
greedy
1500
x28248
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x8032
543E
Listening to Music
constructive algorithms
,
data structures
3200
x300
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