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Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round)
06:00:12
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→ Filter Problems
Difficulty:
—
data structures
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
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Custom test
Problems
#
Name
1468C
Berpizza
data structures
,
implementation
1400
x7829
1468B
Bakery
data structures
,
dsu
2900
x214
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1662
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1437
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x197
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x11345
1464F
My Beautiful Madness
data structures
,
trees
3500
x324
1462F
The Treasure of The Segments
binary search
,
data structures
,
greedy
1800
x6972
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9239
1458F
Range Diameter Sum
data structures
,
trees
3500
x280
1458E
Nim Shortcuts
data structures
,
games
3100
x493
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x1098
1455G
Forbidden Value
data structures
,
dp
2900
x411
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x4043
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x487
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5481
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x334
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1304
1446D1
Frequency Problem (Easy Version)
data structures
,
greedy
2600
x1743
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3628
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1600
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x2225
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4485
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x221
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1871
1439B
Graph Subset Problem
constructive algorithms
,
data structures
,
graphs
2600
x1470
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x19715
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x1002
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3455
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2265
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6499
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8802
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x24474
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2305
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3664
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x20223
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x313
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x16006
1425I
Impressive Harvesting of The Orchard
data structures
2800
x237
1424G
Years
data structures
,
sortings
1300
x5865
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x526
1423G
Growing flowers
data structures
3500
x214
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x1028
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7589
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4686
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x491
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1937
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x369
1418D
Trash Problem
data structures
,
implementation
2100
x4362
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x294
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x2055
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4414
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12542
1413F
Roads and Ramen
data structures
,
trees
2800
x777
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6499
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x400
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1978
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4313
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4895
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3499
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2665
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x366
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x290
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1189
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1744
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2432
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5440
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x10271
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1611
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5828
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x18277
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1281
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2422
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x26427
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x308
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16702
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x2150
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x980
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x591
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6424
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x521
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x122
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2537
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x786
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13291
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20497
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x784
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x2182
1380A
Three Indices
brute force
,
data structures
900
x25753
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x507
1379F1
Chess Strikes Back (easy version)
binary search
,
data structures
2700
x598
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1085
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5570
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x21150
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x927
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x14036
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x794
1373F
Network Coverage
binary search
,
constructive algorithms
,
data structures
,
greedy
2400
x1663
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x615
1370E
Binary Subsequence Rotation
binary search
,
constructive algorithms
,
data structures
,
greedy
2100
x4882
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