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Custom test
Problems
#
Name
556B
Case of Fake Numbers
brute force
,
implementation
1100
x8199
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x10948
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x14513
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1739
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4858
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5881
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x4066
551A
GukiZ and Contest
brute force
,
implementation
,
sortings
800
x17881
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x32304
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x27709
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x43790
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x9004
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x10337
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2751
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x19470
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x18649
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x236556
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1863
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2522
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x6141
538A
Cutting Banner
brute force
,
implementation
1400
x7384
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x26767
535A
Tavas and Nafas
brute force
,
implementation
1000
x13054
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x1000
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2874
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2652
526A
King of Thieves
brute force
,
implementation
1300
x5011
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x4201
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x418
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7769
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x22682
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1849
513B1
Permutations
brute force
1400
x3833
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x6436
509A
Maximum in Table
brute force
,
implementation
800
x44232
508A
Pasha and Pixels
brute force
1100
x8459
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2549
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6930
497D
Gears
brute force
,
geometry
,
math
2900
x248
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x8162
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x6210
496A
Minimum Difficulty
brute force
,
implementation
,
math
900
x17191
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x7521
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1701
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2316
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x9481
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x7057
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2263
488A
Giga Tower
brute force
1100
x14953
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3953
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x12414
485B
Valuable Resources
brute force
,
greedy
1300
x6796
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x24909
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x8443
479A
Expression
brute force
,
math
1000
x112720
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x253
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x37256
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x6607
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x834
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x9276
474C
Captain Marmot
brute force
,
geometry
2000
x3389
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3747
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x43022
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x42071
466B
Wonder Room
brute force
,
math
2000
x5273
464B
Restore Cube
brute force
,
geometry
2000
x1783
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1746
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x30027
463A
Caisa and Sugar
brute force
,
implementation
1200
x9566
462A
Appleman and Easy Task
brute force
,
implementation
1000
x17882
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x383
460D
Little Victor and Set
brute force
,
constructive algorithms
,
math
2300
x1038
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x13390
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x52154
457C
Elections
brute force
2100
x947
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x5419
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x2120
452A
Eevee
brute force
,
implementation
,
strings
1000
x8527
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3589
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1639
448D
Multiplication Table
binary search
,
brute force
1800
x16780
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3862
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4283
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2352
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x1140
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x4177
436F
Banners
brute force
,
data structures
,
dp
3000
x463
435D
Special Grid
brute force
,
dp
,
greedy
2000
x789
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x17934
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x12269
431B
Shower Line
brute force
,
implementation
1200
x11707
430B
Balls Game
brute force
,
two pointers
1400
x4127
425A
Sereja and Swaps
brute force
,
sortings
1500
x4182
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x613
416B
Art Union
brute force
,
dp
,
implementation
1300
x9423
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x9495
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x1193
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x5176
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x6375
402B
Trees in a Row
brute force
,
implementation
1400
x3996
←
1
2
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→
→ Pay attention
Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
brute force
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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