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Before contest
Codeforces Round 978 (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
1093A
Dice Rolling
math
800
x17698
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x8086
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1735
1092D2
Great Vova Wall (Version 2)
data structures
,
implementation
2200
x2984
1092D1
Great Vova Wall (Version 1)
greedy
,
implementation
,
math
2200
x4750
1092C
Prefixes and Suffixes
strings
1700
x5928
1092B
Teams Forming
sortings
800
x26331
1092A
Uniform String
implementation
800
x16258
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
x823
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x1008
1091D
New Year and the Permutation Concatenation
combinatorics
,
dp
,
math
1700
x6769
1091C
New Year and the Sphere Transmission
math
,
number theory
1400
x10010
1091B
New Year and the Treasure Geolocation
brute force
,
constructive algorithms
,
greedy
,
implementation
1200
x10670
1091A
New Year and the Christmas Ornament
brute force
,
implementation
,
math
800
x17494
1090M
The Pleasant Walk
implementation
1000
x6270
1090L
Berland University
greedy
,
math
2000
x1259
1090K
Right Expansion Of The Mind
math
2000
x1063
1090J
Two Prefixes
strings
2600
x438
1090I
Minimal Product
2000
x1040
1090H
Linearization
graphs
2900
x94
1090G
Combostone
games
,
implementation
2500
x105
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x317
1090E
Horseback Riding
flows
,
graphs
2300
x588
1090D
Similar Arrays
constructive algorithms
1800
x2058
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x493
1090B
LaTeX Expert
1900
x1394
1090A
Company Merging
greedy
1300
x4193
1089M
Minegraphed
constructive algorithms
,
graphs
2400
x588
1089L
Lazyland
900
x3931
1089K
King Kog's Reception
data structures
2400
x1098
1089J
JS Minification
greedy
,
implementation
3200
x129
1089I
Interval-Free Permutations
combinatorics
2600
x375
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x111
1089G
Guest Student
math
1500
x2893
1089F
Fractions
math
1900
x1933
1089E
Easy Chess
constructive algorithms
1700
x1971
1089D
Distance Sum
graphs
3100
x100
1089C
Cactus Search
interactive
2500
x407
1089B
Bimatching
graphs
3200
x220
1089A
Alice the Fan
dp
2200
x1122
1088F
Ehab and a weird weight formula
data structures
,
trees
2800
x514
1088E
Ehab and a component choosing problem
dp
,
greedy
,
math
,
trees
2400
x1483
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2840
1088C
Ehab and a 2-operation task
constructive algorithms
,
greedy
,
math
1400
x8062
1088B
Ehab and subtraction
implementation
,
sortings
1000
x12596
1088A
Ehab and another construction problem
brute force
,
constructive algorithms
800
x16804
1086F
Forest Fires
math
3500
x240
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x522
1085F
Rock-Paper-Scissors Champion
2500
x614
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x1062
1085D
Minimum Diameter Tree
constructive algorithms
,
implementation
,
trees
1700
x5430
1085C
Connect Three
implementation
,
math
1600
x5436
1085B
Div Times Mod
math
1100
x9290
1085A
Right-Left Cipher
implementation
,
strings
800
x12153
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x8093
1084B
Kvass and the Fair Nut
greedy
,
implementation
1200
x7809
1084A
The Fair Nut and Elevator
brute force
,
implementation
1000
x7920
1083F
The Fair Nut and Amusing Xor
data structures
3300
x276
1083E
The Fair Nut and Rectangles
data structures
,
dp
,
geometry
2400
x4228
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x236
1083C
Max Mex
data structures
,
trees
2900
x893
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1947
1083A
The Fair Nut and the Best Path
data structures
,
dp
,
trees
1800
x5429
1082G
Petya and Graph
flows
,
graphs
2400
x2097
1082F
Speed Dial
dp
,
strings
,
trees
2800
x421
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x4518
1082D
Maximum Diameter Graph
constructive algorithms
,
graphs
,
implementation
1800
x3808
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5719
1082B
Vova and Trophies
greedy
1600
x7567
1082A
Vasya and Book
implementation
,
math
1200
x8560
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x106
1081G
Mergesort Strikes Back
math
,
probabilities
3200
x392
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x468
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2589
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x4054
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x7288
1081B
Farewell Party
constructive algorithms
,
implementation
1500
x4453
1081A
Definite Game
constructive algorithms
,
math
800
x12034
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x706
1080E
Sonya and Matrix Beauty
strings
2400
x1115
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1546
1080C
Masha and two friends
implementation
1500
x4042
1080B
Margarite and the best present
math
900
x11781
1080A
Petya and Origami
math
800
x18098
1078E
Negative Time Summation
constructive algorithms
3400
x88
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x3316
1077F1
Pictures with Kittens (easy version)
dp
1900
x4424
1077E
Thematic Contests
greedy
,
sortings
1800
x4684
1077D
Cutting Out
binary search
,
sortings
1600
x8890
1077C
Good Array
1300
x17302
1077B
Disturbed People
greedy
1000
x18981
1077A
Frog Jumping
math
800
x29962
1076G
Array Game
data structures
,
games
3000
x579
1076F
Summer Practice Report
dp
,
greedy
2500
x642
1076E
Vasya and a Tree
data structures
,
trees
1900
x3755
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x5201
1076C
Meme Problem
binary search
,
math
1300
x12457
1076B
Divisor Subtraction
implementation
,
math
,
number theory
1200
x12963
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