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Before contest
Codeforces Round 941 (Div. 1)
20:21:23
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
20:21:24
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sortings
combine-tags-by-or
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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
56E
Domino Principle
binary search
,
data structures
,
sortings
2200
x2210
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2212
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2214
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2217
237B
Young Table
implementation
,
sortings
1500
x2218
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2230
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2234
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2239
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2253
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2258
1183G
Candy Box (hard version)
greedy
,
implementation
,
sortings
2000
x2274
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2292
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2292
1196F
K-th Path
brute force
,
constructive algorithms
,
shortest paths
,
sortings
2200
x2299
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2315
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2315
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2349
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2353
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2364
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2372
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2387
549G
Happy Line
constructive algorithms
,
greedy
,
sortings
2200
x2391
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2395
108B
Datatypes
math
,
sortings
1400
x2407
115B
Lawnmower
greedy
,
sortings
1500
x2421
432C
Prime Swaps
greedy
,
sortings
1800
x2430
1187D
Subarray Sorting
data structures
,
sortings
2400
x2448
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2459
38E
Let's Go Rolling!
dp
,
sortings
1800
x2480
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2488
853B
Jury Meeting
greedy
,
sortings
,
two pointers
1800
x2503
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x2505
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2514
1223E
Paint the Tree
dp
,
sortings
,
trees
2100
x2515
571B
Minimization
dp
,
greedy
,
sortings
2000
x2522
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2537
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2581
1422D
Returning Home
graphs
,
shortest paths
,
sortings
2300
x2586
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2598
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2600
22D
Segments
greedy
,
sortings
1900
x2601
1253E
Antenna Coverage
data structures
,
dp
,
greedy
,
sortings
2200
x2618
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2628
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2639
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2646
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2666
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2668
1043E
Train Hard, Win Easy
constructive algorithms
,
greedy
,
math
,
sortings
1900
x2683
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2713
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x2745
1375E
Inversion SwapSort
constructive algorithms
,
greedy
,
sortings
2500
x2764
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2776
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2788
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2789
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2823
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2887
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x2891
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2894
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2903
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2911
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2932
863E
Turn Off The TV
data structures
,
sortings
2000
x2942
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x2947
747D
Winter Is Coming
dp
,
greedy
,
sortings
1800
x2950
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x2985
802M
April Fools' Problem (easy)
greedy
,
sortings
1200
x3016
794C
Naming Company
games
,
greedy
,
sortings
1800
x3025
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3049
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3069
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3076
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3091
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3097
492D
Vanya and Computer Game
binary search
,
implementation
,
math
,
sortings
1800
x3115
437D
The Child and Zoo
dsu
,
sortings
1900
x3132
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3150
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3195
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3199
1690G
Count the Trains
binary search
,
data structures
,
greedy
,
sortings
2000
x3219
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x3221
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x3246
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3309
160C
Find Pair
implementation
,
math
,
sortings
1700
x3380
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3384
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3413
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3415
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3416
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x3439
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3467
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3476
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3478
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3497
334B
Eight Point Sets
sortings
1400
x3541
15A
Cottage Village
implementation
,
sortings
1200
x3555
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3572
1260D
A Game with Traps
binary search
,
dp
,
greedy
,
sortings
1900
x3580
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3630
612D
The Union of k-Segments
greedy
,
sortings
1800
x3665
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3667
631C
Report
data structures
,
sortings
1700
x3681
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