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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
28:46:10
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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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Status
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Custom test
Problems
#
Name
178A1
Educational Game
1000
x1536
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1533
117B
Very Interesting Game
brute force
,
number theory
1800
x1533
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1531
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1530
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1530
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1529
520D
Cubes
games
,
greedy
,
implementation
2100
x1529
508E
Arthur and Brackets
dp
,
greedy
2200
x1526
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1520
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1519
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1516
396C
On Changing Tree
data structures
,
graphs
,
trees
x1516
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1516
1304F1
Animal Observation (easy version)
data structures
,
dp
2300
x1515
513C
Second price auction
bitmasks
,
probabilities
2000
x1515
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1514
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1514
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1513
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1511
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1511
130A
Hexagonal numbers
*special problem
,
implementation
900
x1511
245C
Game with Coins
greedy
1700
x1508
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1507
234D
Cinema
implementation
1600
x1507
1045G
AI robots
data structures
2200
x1506
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1505
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1505
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1504
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1503
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1502
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1502
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1502
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1501
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1501
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1501
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1500
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1500
16D
Logging
implementation
,
strings
1900
x1500
226B
Naughty Stone Piles
greedy
1900
x1499
916E
Jamie and Tree
data structures
,
trees
2400
x1498
1607G
Banquet Preparations 1
greedy
2200
x1497
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1497
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1497
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1496
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1495
351E
Jeff and Permutation
greedy
2200
x1495
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1494
2C
Commentator problem
geometry
2600
x1494
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1492
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1492
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1491
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1490
1866H
Happy Sets
combinatorics
2100
x1489
995A
Tesla
constructive algorithms
,
implementation
2100
x1489
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1488
594D
REQ
data structures
,
number theory
2500
x1487
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1486
56D
Changing a String
dp
2100
x1486
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1483
74B
Train
dp
,
games
,
greedy
1500
x1482
1910A
Username
*special problem
,
implementation
1100
x1481
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1478
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1476
837E
Vasya's Function
binary search
,
implementation
,
math
2100
x1476
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1476
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1475
847K
Travel Cards
greedy
,
implementation
,
sortings
1800
x1475
17E
Palisection
strings
2900
x1475
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1474
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
2300
x1474
521D
Shop
greedy
2800
x1474
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1474
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1473
1798E
Multitest Generator
brute force
,
dp
2300
x1473
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2300
x1473
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1472
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1472
549B
Looksery Party
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2300
x1472
1093E
Intersection of Permutations
data structures
2400
x1471
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1470
137D
Palindromes
dp
,
strings
1900
x1469
1032E
The Unbearable Lightness of Weights
dp
,
math
2100
x1468
452D
Washer, Dryer, Folder
greedy
,
implementation
1900
x1468
39F
Pacifist frogs
implementation
1300
x1468
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1467
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1464
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1464
325B
Stadium and Games
binary search
,
math
1800
x1464
1098B
Nice table
brute force
,
constructive algorithms
,
greedy
,
math
2100
x1463
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1462
254C
Anagram
greedy
,
strings
1800
x1462
1482F
Useful Edges
graphs
,
shortest paths
2400
x1461
5D
Follow Traffic Rules
implementation
,
math
2100
x1461
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1459
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1459
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1458
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1457
291D
Parallel Programming
*special problem
,
greedy
1600
x1457
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1456
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