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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
38:00:55
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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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Custom test
Problems
#
Name
1105E
Helping Hiasat
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2200
x1577
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1576
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1576
732E
Sockets
greedy
,
sortings
2100
x1575
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1575
215D
Hot Days
greedy
1900
x1574
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1573
55C
Pie or die
games
1900
x1573
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1572
576B
Invariance of Tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2100
x1571
899F
Letters Removing
data structures
,
strings
2100
x1570
585D
Lizard Era: Beginning
meet-in-the-middle
2300
x1570
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2300
x1569
770D
Draw Brackets!
*special problem
,
implementation
1400
x1567
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1565
316B2
EKG
dfs and similar
,
dp
1600
x1565
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1564
2C
Commentator problem
geometry
2600
x1564
1096F
Inversion Expectation
dp
,
math
,
probabilities
2300
x1562
178A2
Educational Game
greedy
1000
x1561
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1560
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1557
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1555
704B
Ant Man
dp
,
graphs
,
greedy
2500
x1555
348D
Turtles
dp
,
matrices
2500
x1554
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1553
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1552
1184E1
Daleks' Invasion (easy)
graphs
,
trees
1900
x1552
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1551
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1550
730A
Toda 2
greedy
,
implementation
1800
x1549
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1547
178A1
Educational Game
1000
x1546
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1544
257D
Sum
greedy
,
math
1900
x1543
916E
Jamie and Tree
data structures
,
trees
2400
x1542
317B
Ants
brute force
,
implementation
2000
x1542
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1541
1250N
Wires
dfs and similar
,
graphs
,
greedy
2000
x1541
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1540
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1538
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1536
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1535
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1535
226B
Naughty Stone Piles
greedy
1900
x1534
117B
Very Interesting Game
brute force
,
number theory
1800
x1534
520D
Cubes
games
,
greedy
,
implementation
2100
x1530
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1529
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1528
508E
Arthur and Brackets
dp
,
greedy
2200
x1527
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1527
1910A
Username
*special problem
,
implementation
1100
x1525
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1524
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1524
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1522
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1521
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1521
1304F1
Animal Observation (easy version)
data structures
,
dp
2300
x1521
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1519
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1519
396C
On Changing Tree
data structures
,
graphs
,
trees
x1518
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1517
1045G
AI robots
data structures
2200
x1517
130A
Hexagonal numbers
*special problem
,
implementation
900
x1517
513C
Second price auction
bitmasks
,
probabilities
2000
x1516
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1515
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1515
1866H
Happy Sets
combinatorics
2100
x1513
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1513
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1513
234D
Cinema
implementation
1600
x1513
5D
Follow Traffic Rules
implementation
,
math
2100
x1512
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1511
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1509
245C
Game with Coins
greedy
1700
x1509
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1507
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1506
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1506
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1505
1607G
Banquet Preparations 1
greedy
2200
x1504
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1504
56D
Changing a String
dp
2100
x1504
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1503
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1503
16D
Logging
implementation
,
strings
1900
x1503
594D
REQ
data structures
,
number theory
2500
x1501
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1500
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1499
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1499
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1499
351E
Jeff and Permutation
greedy
2200
x1499
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1498
837E
Vasya's Function
binary search
,
implementation
,
math
2100
x1498
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1498
995A
Tesla
constructive algorithms
,
implementation
2100
x1497
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1493
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1493
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1492
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1492
17E
Palisection
strings
2900
x1490
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