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Codeforces Round 973 (Div. 2)
13:27:06
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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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Custom test
Problems
#
Name
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x11927
1983B
Corner Twist
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15549
1983A
Array Divisibility
constructive algorithms
,
math
800
x24930
1982F
Sorting Problem Again
binary search
,
data structures
,
sortings
2600
x894
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1499
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6819
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x16737
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x16350
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x24259
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x246
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x789
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1554
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x5090
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x13246
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x21744
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x1182
1980F2
Field Division (hard version)
math
,
sortings
2400
x943
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3598
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10055
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x13800
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x17998
1980B
Choosing Cubes
sortings
,
sortings
800
x33718
1980A
Problem Generator
math
800
x39231
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x302
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1384
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6360
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x18163
1979B
XOR Sequences
bitmasks
,
greedy
1000
x21950
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x28473
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1264
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3612
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x10782
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x14377
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x21732
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x24915
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x642
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1758
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6505
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x17222
1977A
Little Nikita
math
800
x30336
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x523
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x988
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x4144
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9980
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x21721
1976A
Verify Password
implementation
,
sortings
,
strings
800
x27910
1975I
Mind Bloom
dp
3500
x82
1975H
378QAQ and Core
greedy
,
strings
3500
x111
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x216
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x784
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x2190
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5757
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x14051
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x17274
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x18221
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x4073
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3449
1974E
Money Buys Happiness
dp
1800
x7647
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x14319
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x15298
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x29541
1974A
Phone Desktop
greedy
,
math
800
x32523
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x202
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x773
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1860
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8074
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13587
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x23751
1972B
Coin Games
games
900
x20945
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x22523
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1719
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8885
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9583
1971E
Find the Car
binary search
,
math
,
sortings
1500
x13714
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25223
1971C
Clock and Strings
implementation
900
x31747
1971B
Different String
implementation
,
strings
800
x35766
1971A
My First Sorting Problem
implementation
,
sortings
800
x43375
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x316
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x546
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1269
1970F3
Playing Quidditch (Hard)
implementation
2300
x337
1970F2
Playing Quidditch (Medium)
implementation
2300
x328
1970F1
Playing Quidditch (Easy)
implementation
2300
x408
1970E3
Trails (Hard)
dp
,
matrices
2200
x684
1970E2
Trails (Medium)
dp
,
matrices
2000
x1186
1970E1
Trails (Easy)
dp
1800
x1997
1970D3
Arithmancy (Hard)
interactive
3100
x106
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x198
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x569
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1432
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2491
1970C1
Game on Tree (Easy)
games
1400
x3187
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x455
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x749
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x1061
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x433
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x419
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x4281
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x250
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