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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
10:14:44
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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
1453C
Triangles
greedy
,
implementation
1700
x6009
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x13268
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7889
1452B
Toy Blocks
binary search
,
greedy
,
math
,
sortings
1400
x14596
1451D
Circle Game
games
,
geometry
,
math
1700
x9429
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15361
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5420
1446B
Catching Cheaters
dp
,
strings
1800
x7737
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x15288
1444B
Divide and Sum
combinatorics
,
math
,
sortings
1900
x6207
1444A
Division
brute force
,
math
,
number theory
1500
x12846
1443C
The Delivery Dilemma
binary search
,
greedy
,
sortings
1400
x15111
1443B
Saving the City
dp
,
greedy
,
math
,
sortings
1300
x15668
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4435
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x8743
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x5069
1439A1
Binary Table (Easy Version)
constructive algorithms
,
implementation
1500
x9302
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12568
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10327
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5983
1436C
Binary Search
binary search
,
combinatorics
1500
x10723
1433E
Two Round Dances
combinatorics
,
math
1300
x18283
1431D
Used Markers
*special problem
,
greedy
1500
x451
1431C
Black Friday
*special problem
,
implementation
1600
x701
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1006
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6381
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8737
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4448
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10835
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7329
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15770
1425H
Huge Boxes of Animal Toys
constructive algorithms
1300
x4115
1425F
Flamingoes of Mystery
interactive
1400
x5385
1425A
Arena of Greed
games
,
greedy
1400
x6440
1424G
Years
data structures
,
sortings
1300
x5733
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4772
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1789
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8162
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14302
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4137
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12686
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7490
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17339
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15144
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15197
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x19111
1418B
Negative Prefixes
greedy
,
sortings
1300
x16524
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12189
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10798
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6452
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5659
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7920
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7727
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19102
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8769
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9886
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11792
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16880
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10077
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7295
1404A
Balanced Bitstring
implementation
,
strings
1500
x15133
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1169
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9026
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23878
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x10007
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x17039
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11019
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x17961
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x11203
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x25283
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14542
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x11135
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15210
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13836
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6586
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10395
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16451
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8631
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14783
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18681
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16269
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9496
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18900
1384B1
Koa and the Beach (Easy Version)
brute force
,
dp
,
greedy
1900
x3873
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4860
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10379
1381B
Unmerge
dp
1800
x8670
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12981
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20127
1380C
Create The Teams
brute force
,
dp
,
greedy
,
implementation
,
sortings
1400
x20405
1380B
Universal Solution
greedy
1400
x14460
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12574
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11721
1375D
Replace by MEX
brute force
,
constructive algorithms
,
sortings
1900
x9069
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x20903
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x13877
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x23163
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15427
1373C
Pluses and Minuses
math
1300
x18237
1372C
Omkar and Baseball
constructive algorithms
,
math
1500
x17655
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