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Before contest
Codeforces Round 988 (Div. 3)
28:36:59
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*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
1091H
New Year and the Tricolore Recreation
games
3200
x430
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x209
1091F
New Year and the Mallard Expedition
constructive algorithms
,
greedy
2600
x827
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x1012
1091D
New Year and the Permutation Concatenation
combinatorics
,
dp
,
math
1700
x6811
1091C
New Year and the Sphere Transmission
math
,
number theory
1400
x10057
1090L
Berland University
greedy
,
math
2000
x1290
1090K
Right Expansion Of The Mind
math
2000
x1092
1090J
Two Prefixes
strings
2600
x449
1090I
Minimal Product
2000
x1071
1090H
Linearization
graphs
2900
x99
1090G
Combostone
games
,
implementation
2500
x110
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x326
1090E
Horseback Riding
flows
,
graphs
2300
x606
1090D
Similar Arrays
constructive algorithms
1800
x2105
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x504
1090B
LaTeX Expert
1900
x1432
1089M
Minegraphed
constructive algorithms
,
graphs
2400
x600
1089K
King Kog's Reception
data structures
2400
x1117
1089J
JS Minification
greedy
,
implementation
3200
x130
1089I
Interval-Free Permutations
combinatorics
2600
x382
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x112
1089G
Guest Student
math
1500
x2943
1089F
Fractions
math
1900
x1961
1089E
Easy Chess
constructive algorithms
1700
x1992
1089D
Distance Sum
graphs
3100
x100
1089C
Cactus Search
interactive
2500
x421
1089B
Bimatching
graphs
3200
x225
1089A
Alice the Fan
dp
2200
x1140
1088F
Ehab and a weird weight formula
data structures
,
trees
2800
x517
1088E
Ehab and a component choosing problem
dp
,
greedy
,
math
,
trees
2400
x1493
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2870
1088C
Ehab and a 2-operation task
constructive algorithms
,
greedy
,
math
1400
x8086
1086F
Forest Fires
math
3500
x244
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x526
1085F
Rock-Paper-Scissors Champion
2500
x617
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x1066
1085D
Minimum Diameter Tree
constructive algorithms
,
implementation
,
trees
1700
x5449
1085C
Connect Three
implementation
,
math
1600
x5446
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x8223
1083F
The Fair Nut and Amusing Xor
data structures
3300
x277
1083E
The Fair Nut and Rectangles
data structures
,
dp
,
geometry
2400
x4298
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x239
1083C
Max Mex
data structures
,
trees
2900
x921
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1960
1083A
The Fair Nut and the Best Path
data structures
,
dp
,
trees
1800
x5486
1082G
Petya and Graph
flows
,
graphs
2400
x2140
1082F
Speed Dial
dp
,
strings
,
trees
2800
x422
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x4646
1082D
Maximum Diameter Graph
constructive algorithms
,
graphs
,
implementation
1800
x3822
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5781
1082B
Vova and Trophies
greedy
1600
x7587
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x107
1081G
Mergesort Strikes Back
math
,
probabilities
3200
x393
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x475
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2600
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x4145
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x7340
1081B
Farewell Party
constructive algorithms
,
implementation
1500
x4464
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x723
1080E
Sonya and Matrix Beauty
strings
2400
x1127
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1561
1080C
Masha and two friends
implementation
1500
x4058
1078E
Negative Time Summation
constructive algorithms
3400
x88
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x3362
1077F1
Pictures with Kittens (easy version)
dp
1900
x4473
1077E
Thematic Contests
greedy
,
sortings
1800
x4734
1077D
Cutting Out
binary search
,
sortings
1600
x8980
1076G
Array Game
data structures
,
games
3000
x591
1076F
Summer Practice Report
dp
,
greedy
2500
x645
1076E
Vasya and a Tree
data structures
,
trees
1900
x3781
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x5261
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x925
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x546
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2651
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6434
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4807
1071E
Rain Protection
binary search
,
geometry
3500
x146
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x69
1070L
Odd Federalization
constructive algorithms
2600
x302
1070J
Streets and Avenues in Berhattan
dp
2300
x700
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x726
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3666
1070G
Monsters and Potions
brute force
,
dp
,
greedy
,
implementation
2300
x843
1070F
Debate
greedy
1500
x3658
1070E
Getting Deals Done
binary search
,
data structures
2100
x1388
1070C
Cloud Computing
data structures
,
greedy
2000
x2061
1070B
Berkomnadzor
data structures
,
greedy
2400
x652
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x2369
1068C
Colored Rooks
constructive algorithms
,
graphs
1700
x3163
1068A
Birthday
math
1400
x6850
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x454
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x406
1067C
Knights
constructive algorithms
2600
x657
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2710
1067A
Array Without Local Maximums
dp
1900
x2887
1066F
Yet another 2D Walking
dp
2100
x2072
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x6188
1066D
Boxes Packing
binary search
,
implementation
1800
x5504
1066C
Books Queries
implementation
1400
x9708
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