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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
10:01:59
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Difficulty:
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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
468C
Hack it!
binary search
,
constructive algorithms
,
math
2500
x2333
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x4049
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x772
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1786
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2165
466D
Increase Sequence
combinatorics
,
dp
2100
x3102
466B
Wonder Room
brute force
,
math
2000
x4843
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1402
464D
World of Darkraft - 2
dp
,
probabilities
2700
x663
464C
Substitutes in Number
dp
2100
x1843
464B
Restore Cube
brute force
,
geometry
2000
x1672
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1583
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x370
461D
Appleman and Complicated Task
dsu
,
math
2800
x361
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1323
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5467
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x340
460D
Little Victor and Set
brute force
,
constructive algorithms
,
math
2300
x990
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
457C
Elections
brute force
2100
x874
455E
Function
data structures
2900
x670
455D
Serega and Fun
data structures
2700
x2866
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5615
453E
Little Pony and Lord Tirek
data structures
3100
x697
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x464
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1622
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4613
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1422
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1052
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1608
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3501
451D
Count Good Substrings
math
2000
x4678
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
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x8296
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1473
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
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3560
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
444B
DZY Loves FFT
probabilities
2300
x1057
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
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1073
440D
Berland Federalization
dp
,
trees
2200
x656
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1518
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1847
438D
The Child and Sequence
data structures
,
math
2300
x8196
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
435D
Special Grid
brute force
,
dp
,
greedy
2000
x748
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
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1238
432E
Square Tiling
constructive algorithms
,
greedy
2300
x683
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8663
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x954
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2292
429E
Points and Segments
graphs
3000
x839
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2697
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x933
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1415
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2133
425E
Sereja and Sets
dp
2500
x611
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1424
425C
Sereja and Two Sequences
data structures
,
dp
2300
x886
425B
Sereja and Table
bitmasks
,
greedy
2200
x1303
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x130
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x559
420E
Playing the ball
geometry
2600
x214
420D
Cup Trick
data structures
2200
x782
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
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x676
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2191
413E
Maze 2D
data structures
,
divide and conquer
2200
x681
413D
2048
bitmasks
,
dp
2000
x780
412D
Giving Awards
dfs and similar
2000
x1830
409I
Feed the Golorp
*special problem
2400
x118
409G
On a plane
*special problem
,
geometry
2200
x508
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
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