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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
13:57:44
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Difficulty:
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combine-tags-by-or
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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
475F
Meta-universe
data structures
2900
x227
475E
Strongly Connected City 2
dfs and similar
2700
x406
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x396
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x250
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x131
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x81
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x312
468D
Tree
graph matchings
3100
x359
468C
Hack it!
binary search
,
constructive algorithms
,
math
2500
x2333
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1786
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1402
464D
World of Darkraft - 2
dp
,
probabilities
2700
x663
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x370
461D
Appleman and Complicated Task
dsu
,
math
2800
x361
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x340
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x105
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x95
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x276
455E
Function
data structures
2900
x670
455D
Serega and Fun
data structures
2700
x2866
453E
Little Pony and Lord Tirek
data structures
3100
x697
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x464
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1422
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1052
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x285
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4279
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2228
446E
DZY Loves Bridges
math
,
matrices
3100
x122
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x388
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3238
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x750
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x760
444C
DZY Loves Colors
data structures
2400
x2856
442E
Gena and Second Distance
geometry
3100
x172
442D
Adam and Tree
data structures
,
trees
2600
x969
442C
Artem and Array
data structures
,
greedy
2500
x1722
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x685
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1847
437E
The Child and Polygon
dp
,
geometry
2500
x699
436F
Banners
brute force
,
data structures
,
dp
3000
x374
436E
Cardboard Box
data structures
,
greedy
2600
x1301
436D
Pudding Monsters
dp
2800
x323
435E
Special Graph
2500
x236
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x258
434D
Nanami's Power Plant
flows
2900
x406
433E
Tachibana Kanade's Tofu
dp
2500
x474
429E
Points and Segments
graphs
3000
x839
425E
Sereja and Sets
dp
2500
x611
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x130
420E
Playing the ball
geometry
2600
x214
418E
Tricky Password
data structures
3100
x300
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x474
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x787
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1399
416D
Population Size
greedy
,
implementation
,
math
2400
x936
414E
Mashmokh's Designed Problem
data structures
3200
x200
409I
Feed the Golorp
*special problem
2400
x118
407E
k-d-sequence
data structures
3100
x698
407D
Largest Submatrix 3
dp
,
hashing
2700
x556
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x963
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x233
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x205
401E
Olympic Games
math
2500
x168
388E
Fox and Meteor Shower
geometry
3100
x120
388D
Fox and Perfect Sets
math
2700
x441
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2942
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x660
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x371
380E
Sereja and Dividing
data structures
2600
x297
380D
Sereja and Cinema
combinatorics
,
math
2500
x459
380B
Sereja and Tree
graphs
,
implementation
2400
x531
379G
New Year Cactus
dp
3100
x141
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2210
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x338
377E
Cookie Clicker
dp
,
geometry
2800
x449
377D
Developing Game
data structures
2400
x1129
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x404
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6481
375C
Circling Round Treasures
bitmasks
,
shortest paths
2600
x478
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x179
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x170
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x956
370E
Summer Reading
dp
,
greedy
2500
x235
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1100
367D
Sereja and Sets
bitmasks
,
dfs and similar
2400
x650
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x539
364D
Ghd
brute force
,
math
,
probabilities
2900
x2013
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x199
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x686
360D
Levko and Sets
number theory
2600
x399
360C
Levko and Strings
combinatorics
,
dp
2500
x1099
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x463
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x408
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x944
354D
Transferring Pyramid
dp
2900
x460
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x451
351D
Jeff and Removing Periods
data structures
2700
x1035
351C
Jeff and Brackets
dp
,
matrices
2500
x543
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x260
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x435
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