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Codeforces Round (Div. 2)
31:10:49
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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
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Status
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Custom test
Problems
#
Name
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x16945
1979B
XOR Sequences
bitmasks
,
greedy
1000
x20825
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x27139
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1118
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3211
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x9660
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x13098
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x20348
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x23262
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x571
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1608
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5981
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16368
1977A
Little Nikita
math
800
x28494
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x470
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x871
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3653
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9185
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x20446
1976A
Verify Password
implementation
,
sortings
,
strings
800
x26188
1975I
Mind Bloom
dp
3500
x66
1975H
378QAQ and Core
greedy
,
strings
3500
x88
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x200
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x718
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1998
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5286
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x13145
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x16225
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x17567
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3761
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3199
1974E
Money Buys Happiness
dp
1800
x7009
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x13400
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x14381
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x28509
1974A
Phone Desktop
greedy
,
math
800
x31190
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x181
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x712
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1729
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7541
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12815
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x22532
1972B
Coin Games
games
900
x19706
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x21548
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1519
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8249
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8859
1971E
Find the Car
binary search
,
math
,
sortings
1500
x12642
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x23656
1971C
Clock and Strings
implementation
900
x29623
1971B
Different String
implementation
,
strings
800
x33396
1971A
My First Sorting Problem
implementation
,
sortings
800
x40463
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x273
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x473
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1109
1970F3
Playing Quidditch (Hard)
implementation
2300
x313
1970F2
Playing Quidditch (Medium)
implementation
2300
x307
1970F1
Playing Quidditch (Easy)
implementation
2300
x381
1970E3
Trails (Hard)
dp
,
matrices
2200
x559
1970E2
Trails (Medium)
dp
,
matrices
2000
x988
1970E1
Trails (Easy)
dp
1800
x1651
1970D3
Arithmancy (Hard)
interactive
3100
x89
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x168
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x510
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1220
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2098
1970C1
Game on Tree (Easy)
games
1400
x2746
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x398
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x651
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x923
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x398
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x388
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x3746
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x213
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1193
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4061
1969C
Minimizing the Sum
dp
,
implementation
1700
x7670
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x17344
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x18738
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1727
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3830
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4895
1968E
Cells Arrangement
constructive algorithms
1600
x9449
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x13728
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x23031
1968B
Prefiquence
greedy
,
two pointers
800
x26297
1968A
Maximize?
brute force
,
math
,
number theory
800
x31390
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x52
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x85
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x172
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x559
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1515
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3583
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12058
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x11289
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x13895
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x16780
1965F
Conference
data structures
,
flows
3300
x133
1965E
Connected Cubes
constructive algorithms
,
games
3100
x217
1965D
Missing Subarray Sum
constructive algorithms
2900
x336
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