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Codeforces Round 973 (Div. 2)
13:52:21
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Difficulty:
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dsu
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
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1519
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x880
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5896
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x8212
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21550
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2392
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1559
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1884
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7275
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7459
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15929
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1128
1578B
Building Forest Trails
data structures
,
dsu
2800
x338
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3787
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x620
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x747
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2630
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13751
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x322
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x851
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x1020
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3317
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x669
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2461
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12786
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1934
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1768
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5362
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1485
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2559
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3838
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8612
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x4252
1468B
Bakery
data structures
,
dsu
2900
x212
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2866
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1504
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1590
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4472
1434E
A Convex Game
dsu
,
games
3500
x175
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x522
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x491
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x2045
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7966
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x1032
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1974
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1186
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x956
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x513
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1547
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10567
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x2176
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9607
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17186
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1624
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x6049
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x2183
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x16540
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x582
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x981
1303F
Number of Components
dsu
,
implementation
2800
x532
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13318
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1732
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3970
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4944
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13924
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x265
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1770
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x9201
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16736
1249B1
Books Exchange (easy version)
dsu
,
math
1000
x20641
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x7516
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x7491
1236E
Alice and the Unfair Game
binary search
,
data structures
,
dp
,
dsu
2500
x654
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2754
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x584
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x7201
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2585
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x3205
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x9224
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x562
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10992
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x18226
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x701
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2998
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3873
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1203
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12539
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3334
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6649
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3248
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8558
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1354
1108F
MST Unification
binary search
,
dsu
,
graphs
,
greedy
2100
x2893
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x1042
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x6128
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x4036
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x4989
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x396
1044D
Deduction Queries
data structures
,
dsu
2400
x1001
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1299
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