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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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Custom test
Problems
#
Name
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2215
466D
Increase Sequence
combinatorics
,
dp
2100
x3169
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x35929
466B
Wonder Room
brute force
,
math
2000
x4896
466A
Cheap Travel
implementation
1200
x62976
465B
Inbox (100500)
implementation
1000
x10399
465A
inc ARG
implementation
900
x10015
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1446
464D
World of Darkraft - 2
dp
,
probabilities
2700
x667
464C
Substitutes in Number
dp
2100
x1847
464B
Restore Cube
brute force
,
geometry
2000
x1707
464A
No to Palindromes!
greedy
,
strings
1700
x5909
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1597
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x6369
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8717
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x27078
463A
Caisa and Sugar
brute force
,
implementation
1200
x9244
462B
Appleman and Card Game
greedy
1300
x14405
462A
Appleman and Easy Task
brute force
,
implementation
1000
x16843
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x375
461D
Appleman and Complicated Task
dsu
,
math
2800
x363
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1331
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5594
461A
Appleman and Toastman
greedy
,
sortings
1200
x15470
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x342
460D
Little Victor and Set
brute force
,
constructive algorithms
,
math
2300
x995
460C
Present
binary search
,
data structures
,
greedy
1700
x6186
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12307
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x45737
459E
Pashmak and Graph
dp
,
sortings
1900
x5391
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x10029
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6170
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x40114
459A
Pashmak and Garden
implementation
1200
x32740
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x107
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x96
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x278
457C
Elections
brute force
2100
x876
457B
Distributed Join
greedy
1900
x1129
457A
Golden System
math
,
meet-in-the-middle
1700
x1272
456B
Fedya and Maths
math
,
number theory
1200
x16547
456A
Laptops
sortings
1100
x47774
455E
Function
data structures
2900
x678
455D
Serega and Fun
data structures
2700
x2953
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5707
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5932
455A
Boredom
dp
1500
x57910
454B
Little Pony and Sort by Shift
implementation
1200
x18134
454A
Little Pony and Crystal Mine
implementation
800
x14790
453E
Little Pony and Lord Tirek
data structures
3100
x717
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x469
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1630
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4667
453A
Little Pony and Expected Maximum
probabilities
1600
x10393
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1490
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1061
452D
Washer, Dryer, Folder
greedy
,
implementation
1900
x1500
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1619
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1995
452A
Eevee
brute force
,
implementation
,
strings
1000
x7987
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3588
451D
Count Good Substrings
math
2000
x4721
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3323
451B
Sort the Array
implementation
,
sortings
1300
x45082
451A
Game With Sticks
implementation
900
x65284
450B
Jzzhu and Sequences
implementation
,
math
1300
x26101
450A
Jzzhu and Children
implementation
1000
x34333
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x285
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4374
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2253
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x8458
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3930
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1537
448D
Multiplication Table
binary search
,
brute force
1800
x13943
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x8157
448B
Suffix Structures
implementation
,
strings
1400
x16013
448A
Rewards
implementation
800
x24178
447B
DZY Loves Strings
greedy
,
implementation
1000
x20263
447A
DZY Loves Hash
implementation
800
x9568
446E
DZY Loves Bridges
math
,
matrices
3100
x133
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x394
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3315
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3573
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12509
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12523
445A
DZY Loves Chessboard
dfs and similar
,
implementation
1200
x29518
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x764
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x773
444C
DZY Loves Colors
data structures
2400
x2908
444B
DZY Loves FFT
probabilities
2300
x1066
444A
DZY Loves Physics
greedy
,
math
1600
x3402
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4054
443A
Anton and Letters
constructive algorithms
,
implementation
800
x88920
442E
Gena and Second Distance
geometry
3100
x172
442D
Adam and Tree
data structures
,
trees
2600
x987
442C
Artem and Array
data structures
,
greedy
2500
x1769
442B
Andrey and Problem
greedy
,
math
,
probabilities
1800
x5223
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2108
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x697
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1103
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