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Codeforces Round (Div. 2)
3 days
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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
346A
Alice and Bob
games
,
math
,
number theory
1600
x8551
345G
Suffix Subgroup
*special problem
,
strings
2200
x53
345F
Superstitions Inspection
*special problem
2700
x45
345E
Black Cat Rush
*special problem
2700
x45
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x77
345C
Counting Fridays
*special problem
2000
x124
345B
Triskaidekaphobia
*special problem
2100
x123
345A
Expecting Trouble
*special problem
,
probabilities
1500
x478
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8738
344A
Magnets
implementation
800
x114678
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x697
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5589
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2916
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13318
343A
Rational Resistance
math
,
number theory
1600
x8612
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7835
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x491
342C
Cupboard and Balloons
geometry
1900
x1824
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x3995
342A
Xenia and Divisors
greedy
,
implementation
1200
x12268
341E
Candies Game
constructive algorithms
,
greedy
3000
x437
341D
Iahub and Xors
data structures
2500
x1167
340E
Iahub and Permutations
combinatorics
,
math
2000
x2313
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7084
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4187
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2036
340A
The Wall
math
1200
x7482
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x542
339D
Xenia and Bit Operations
data structures
,
trees
1700
x24342
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8201
339B
Xenia and Ringroad
implementation
1000
x67754
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x203589
338E
Optimize!
data structures
2600
x959
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1101
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1011
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5924
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4826
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9195
337A
Puzzles
greedy
900
x76986
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x112
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x939
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2431
336B
Vasily the Bear and Fly
math
1900
x1181
336A
Vasily the Bear and Triangle
implementation
,
math
1000
x9952
335F
Buy One, Get One Free
dp
,
greedy
3000
x483
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x219
335D
Rectangles and Square
brute force
,
dp
2400
x306
335C
More Reclamation
games
2100
x520
335B
Palindrome
constructive algorithms
,
dp
1900
x2017
335A
Banana
binary search
,
constructive algorithms
,
greedy
1400
x2535
334B
Eight Point Sets
sortings
1400
x3558
334A
Candy Bags
implementation
1000
x18223
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1079
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x1980
333C
Lucky Tickets
brute force
,
constructive algorithms
2700
x375
333B
Chips
greedy
1800
x2608
333A
Secrets
greedy
1600
x3946
332E
Binary Key
dp
,
greedy
,
implementation
2400
x299
332D
Theft of Blueprints
graphs
,
math
2400
x383
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x899
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x7870
332A
Down the Hatch!
implementation
1300
x3542
331E2
Deja Vu
constructive algorithms
,
dp
3100
x218
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x164
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x175
331D2
Escaping on Beaveractor
graphs
2600
x134
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x202
331C3
The Great Julya Calendar
dp
2500
x468
331C2
The Great Julya Calendar
dp
2400
x371
331C1
The Great Julya Calendar
dp
1100
x5999
331B2
Shave Beaver!
data structures
1900
x674
331B1
Shave Beaver!
implementation
1700
x719
331A2
Oh Sweet Beaverette
data structures
,
sortings
1500
x1391
331A1
Oh Sweet Beaverette
brute force
,
implementation
1400
x1347
330B
Road Construction
constructive algorithms
,
graphs
1300
x16532
330A
Cakeminator
brute force
,
implementation
800
x27807
329E
Evil
math
3100
x166
329D
The Evil Temple and the Moving Rocks
constructive algorithms
2500
x390
329C
Graph Reconstruction
constructive algorithms
2400
x882
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x6186
329A
Purification
constructive algorithms
,
greedy
1500
x4611
328B
Sheldon and Ice Pieces
greedy
1500
x1276
328A
IQ Test
implementation
1800
x1990
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1361
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2248
327C
Magic Five
combinatorics
,
math
1700
x3155
327B
Hungry Sequence
math
1200
x19249
327A
Flipping Game
brute force
,
dp
,
implementation
1200
x40676
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x758
325D
Reclamation
dsu
2900
x491
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x333
325B
Stadium and Games
binary search
,
math
1800
x1488
325A
Square and Rectangles
implementation
1500
x2140
323C
Two permutations
data structures
2400
x578
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x385
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x725
322B
Ciel and Flowers
combinatorics
,
math
1600
x11594
322A
Ciel and Dancing
greedy
1000
x8121
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x4729
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x529
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