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Before contest
Codeforces Round #715 (Div. 1)
29:23:20
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Before contest
Codeforces Round #715 (Div. 2)
29:23:20
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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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Problems
#
Name
1249B1
Books Exchange (easy version)
dsu
,
math
1000
x14529
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x10231
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x13370
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x7663
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x6788
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x11328
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x7382
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x6273
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x4736
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x3702
277A
Learning Languages
dfs and similar
,
dsu
1400
x11595
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x10421
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x9804
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x7887
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x7706
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x6099
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x4621
60B
Serial Time!
dfs and similar
,
dsu
1400
x3134
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x11416
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x10229
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x9446
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x8394
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x8009
356A
Knight Tournament
data structures
,
dsu
1500
x8005
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x5986
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x5693
490B
Queue
dsu
,
implementation
1500
x4833
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x4494
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x2562
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x1649
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x1614
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x7424
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x7073
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x5637
722C
Destroying Array
data structures
,
dsu
1600
x5629
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x5384
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x5082
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x5007
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x4175
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x2581
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x9708
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x7938
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x6172
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x5855
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x5583
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x5574
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x5457
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x4424
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x4402
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x3282
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x2699
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2191
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x3769
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x3661
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x3081
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x2729
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2247
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2193
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x2005
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x737
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x5377
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x5208
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x4398
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x3968
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x3320
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x3263
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x3253
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x2843
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x2483
437D
The Child and Zoo
dsu
,
sortings
1900
x2479
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x2461
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x2121
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2026
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x1940
566D
Restructuring Company
data structures
,
dsu
1900
x1874
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x1842
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x1729
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x1693
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x6449
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x4754
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x3273
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x3212
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x2914
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x2358
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x2330
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2211
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2051
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x1759
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1431
187C
Weak Memory
dfs and similar
,
dsu
2000
x1024
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x977
433D
Nanami's Digital Board
dsu
,
implementation
2000
x936
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x582
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x3801
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x3427
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x3013
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x2666
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2317
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x1851
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x1640
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