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Codeforces Round #793 (Div. 2)
06:29:06
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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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Status
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Custom test
Problems
#
Name
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x18195
1249B1
Books Exchange (easy version)
dsu
,
math
1000
x17026
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x12327
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x16153
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x12299
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x8687
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x7644
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x13495
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x11360
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x10157
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x8848
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x6832
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5079
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x4265
277A
Learning Languages
dfs and similar
,
dsu
1400
x13919
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x12349
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x11853
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x10397
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x9486
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x9332
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x7136
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x5584
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5018
60B
Serial Time!
dfs and similar
,
dsu
1400
x3559
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x13400
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x13218
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x11422
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x10342
356A
Knight Tournament
data structures
,
dsu
1500
x9809
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x9386
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x6822
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x6544
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x5557
490B
Queue
dsu
,
implementation
1500
x5226
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x4730
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x3214
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x2350
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x1918
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x1903
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x8425
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x7742
722C
Destroying Array
data structures
,
dsu
1600
x6683
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6310
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6019
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x5813
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x5767
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x4995
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x4610
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x3122
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x12020
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x9121
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x7538
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x7279
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x7003
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x6776
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x6635
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x5103
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x5057
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x4897
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x4261
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x2901
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2270
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x4766
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x4101
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x3633
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3204
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x2723
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2370
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2309
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x915
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x6817
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x6266
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x5639
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x5200
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x4738
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x4009
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x3800
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x3787
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3745
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x3223
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3206
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3199
437D
The Child and Zoo
dsu
,
sortings
1900
x2743
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x2483
566D
Restructuring Company
data structures
,
dsu
1900
x2387
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2306
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x2295
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2019
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x1914
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x1900
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x7446
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5217
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x4189
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x3856
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x3626
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3169
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x2614
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x2608
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2415
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2294
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