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Before contest
Codeforces Round 941 (Div. 1)
13:26:43
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
13:26:43
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*has extra registration
→ Filter Problems
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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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Custom test
Problems
#
Name
994A
Fingerprints
implementation
800
x13868
993F
The Moral Dilemma
3200
x59
993E
Nikita and Order Statistics
chinese remainder theorem
,
fft
,
math
2300
x1335
993D
Compute Power
binary search
,
dp
,
greedy
2500
x592
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1478
993B
Open Communication
bitmasks
,
brute force
1900
x1928
993A
Two Squares
geometry
,
implementation
1600
x3875
992E
Nastya and King-Shamans
binary search
,
data structures
2500
x1263
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1583
992C
Nastya and a Wardrobe
math
1600
x4508
992B
Nastya Studies Informatics
math
,
number theory
1600
x6085
992A
Nastya and an Array
implementation
,
sortings
800
x12885
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x294
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3400
991D
Bishwock
dp
,
greedy
1500
x6998
991C
Candies
binary search
,
implementation
1500
x9828
991B
Getting an A
greedy
,
sortings
900
x12296
991A
If at first you don't succeed...
implementation
1000
x10343
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1720
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x869
990E
Post Lamps
brute force
,
greedy
2100
x1973
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3754
990C
Bracket Sequences Concatenation Problem
implementation
1500
x5789
990B
Micro-World
greedy
,
sortings
1200
x7978
990A
Commentary Boxes
implementation
,
math
1000
x10435
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x228
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x503
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3652
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x6970
989A
A Blend of Springtime
implementation
,
strings
900
x10140
988F
Rain and Umbrellas
dp
2100
x2191
988E
Divisibility by 25
brute force
,
greedy
2100
x3635
988D
Points and Powers of Two
brute force
,
math
1800
x6776
988C
Equal Sums
implementation
,
sortings
1400
x9891
988B
Substrings Sort
sortings
,
strings
1100
x17812
988A
Diverse Team
brute force
,
implementation
800
x23759
987C
Three displays
brute force
,
dp
,
implementation
1400
x13066
987B
High School: Become Human
math
1100
x11320
987A
Infinity Gauntlet
implementation
800
x16231
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x564
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x698
986D
Perfect Encoding
fft
,
math
3100
x322
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2185
986B
Petr and Permutations
combinatorics
,
math
1800
x4553
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x6511
985G
Team Players
combinatorics
2700
x455
985F
Isomorphic Strings
hashing
,
strings
2300
x1694
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3241
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2253
985C
Liebig's Barrels
greedy
1500
x5573
985B
Switches and Lamps
implementation
1200
x7296
985A
Chess Placing
implementation
1100
x8061
984B
Minesweeper
implementation
1100
x7252
984A
Game
sortings
800
x18873
983E
NN country
binary search
,
data structures
,
trees
2800
x866
983D
Arkady and Rectangles
data structures
3300
x320
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x801
983B
XOR-pyramid
dp
1800
x5210
983A
Finite or not?
implementation
,
math
1700
x4447
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x181
982E
Billiard
geometry
,
number theory
2600
x689
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2244
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10761
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8144
982A
Row
brute force
,
constructive algorithms
1200
x8935
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x264
981G
Magic multisets
data structures
2500
x623
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x672
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1991
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3156
981C
Useful Decomposition
implementation
,
trees
1400
x5115
981B
Businessmen Problems
sortings
1000
x6743
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9025
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x190
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1795
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2406
980C
Posterized
games
,
greedy
1700
x3720
980B
Marlin
constructive algorithms
1600
x4617
980A
Links and Pearls
implementation
,
math
900
x10247
979E
Kuro and Topological Parity
dp
2400
x587
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1681
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6070
979B
Treasure Hunt
greedy
1800
x4347
979A
Pizza, Pizza, Pizza!!!
math
1000
x13418
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4189
978F
Mentors
binary search
,
data structures
,
implementation
1500
x8000
978E
Bus Video System
combinatorics
,
math
1400
x9208
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8346
978C
Letters
binary search
,
implementation
,
two pointers
1000
x24294
978B
File Name
greedy
,
strings
800
x34912
978A
Remove Duplicates
implementation
800
x25988
977F
Consecutive Subsequence
dp
1700
x16879
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19142
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x17546
977C
Less or Equal
sortings
1200
x32190
977B
Two-gram
implementation
,
strings
900
x36615
977A
Wrong Subtraction
implementation
800
x154196
976F
Minimal k-covering
flows
,
graphs
2500
x561
976E
Well played!
greedy
,
sortings
2100
x2161
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x665
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