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Codeforces Round 961 (Div. 2)
13:06:35
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Difficulty:
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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
354E
Lucky Number Representation
constructive algorithms
,
dfs and similar
,
dp
2200
x874
354D
Transferring Pyramid
dp
2900
x460
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x3023
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x451
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5448
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x577
353D
Queue
constructive algorithms
,
dp
2000
x2765
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4777
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2268
353A
Domino
implementation
,
math
1200
x18221
352B
Jeff and Periods
implementation
,
sortings
1300
x16135
352A
Jeff and Digits
brute force
,
implementation
,
math
1000
x25066
351E
Jeff and Permutation
greedy
2200
x1543
351D
Jeff and Removing Periods
data structures
2700
x1033
351C
Jeff and Brackets
dp
,
matrices
2500
x543
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2343
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2866
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x755
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x260
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6500
350B
Resort
graphs
1500
x3101
350A
TL
brute force
,
greedy
,
implementation
1200
x16173
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13763
349A
Cinema Line
greedy
,
implementation
1100
x29296
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x435
348D
Turtles
dp
,
matrices
2500
x1659
348C
Subset Sums
brute force
,
data structures
2500
x2136
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2068
348A
Mafia
binary search
,
math
,
sortings
1600
x12819
347B
Fixed Points
brute force
,
implementation
,
math
1100
x9222
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x8866
346E
Doodle Jump
math
,
number theory
3000
x260
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x712
346C
Number Transformation II
greedy
,
math
2200
x1428
346B
Lucky Common Subsequence
dp
,
strings
2000
x3408
346A
Alice and Bob
games
,
math
,
number theory
1600
x8591
345G
Suffix Subgroup
*special problem
,
strings
2200
x55
345F
Superstitions Inspection
*special problem
2700
x47
345E
Black Cat Rush
*special problem
2700
x47
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x79
345C
Counting Fridays
*special problem
2000
x126
345B
Triskaidekaphobia
*special problem
2100
x125
345A
Expecting Trouble
*special problem
,
probabilities
1500
x480
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8769
344A
Magnets
implementation
800
x115619
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x701
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5632
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2977
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13417
343A
Rational Resistance
math
,
number theory
1600
x8634
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7948
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x492
342C
Cupboard and Balloons
geometry
1900
x1828
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x4001
342A
Xenia and Divisors
greedy
,
implementation
1200
x12345
341E
Candies Game
constructive algorithms
,
greedy
3000
x440
341D
Iahub and Xors
data structures
2500
x1172
340E
Iahub and Permutations
combinatorics
,
math
2000
x2335
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7093
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4191
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2050
340A
The Wall
math
1200
x7503
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x542
339D
Xenia and Bit Operations
data structures
,
trees
1700
x24623
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8228
339B
Xenia and Ringroad
implementation
1000
x68097
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x205160
338E
Optimize!
data structures
2600
x964
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1105
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1013
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5979
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4835
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9220
337A
Puzzles
greedy
900
x77414
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
x2434
336B
Vasily the Bear and Fly
math
1900
x1208
336A
Vasily the Bear and Triangle
implementation
,
math
1000
x9980
335F
Buy One, Get One Free
dp
,
greedy
3000
x508
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x219
335D
Rectangles and Square
brute force
,
dp
2400
x323
335C
More Reclamation
games
2100
x521
335B
Palindrome
constructive algorithms
,
dp
1900
x2025
335A
Banana
binary search
,
constructive algorithms
,
greedy
1400
x2537
334B
Eight Point Sets
sortings
1400
x3561
334A
Candy Bags
implementation
1000
x18280
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1088
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x2064
333C
Lucky Tickets
brute force
,
constructive algorithms
2700
x375
333B
Chips
greedy
1800
x2612
333A
Secrets
greedy
1600
x3952
332E
Binary Key
dp
,
greedy
,
implementation
2400
x299
332D
Theft of Blueprints
graphs
,
math
2400
x383
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x900
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x7887
332A
Down the Hatch!
implementation
1300
x3544
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
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