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Before contest
Codeforces Round 950 (Div. 3)
23:17:50
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Difficulty:
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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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Problems
#
Name
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
x55
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
x301
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
x662
1981C
Turtle and an Incomplete Sequence
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
math
x2810
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
x8507
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
x15182
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x364
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1141
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x4685
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x13849
1977A
Little Nikita
math
800
x23384
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
x257
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
x547
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
x2615
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
x7408
1976B
Increase/Decrease/Copy
greedy
,
implementation
x17298
1976A
Verify Password
implementation
,
sortings
x22670
1975I
Mind Bloom
dp
3500
x19
1975H
378QAQ and Core
greedy
,
strings
3500
x38
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x139
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x524
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1562
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4263
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x10738
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x13338
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x15229
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3126
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2642
1974E
Money Buys Happiness
dp
1800
x5733
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x11464
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x12323
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x25855
1974A
Phone Desktop
greedy
,
math
800
x28032
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x139
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x602
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1537
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x6598
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11405
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x20090
1972B
Coin Games
games
900
x17788
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x19672
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1258
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x7205
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x7657
1971E
Find the Car
binary search
,
math
,
sortings
1500
x10821
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x21081
1971C
Clock and Strings
implementation
900
x26311
1971B
Different String
implementation
,
strings
800
x29853
1971A
My First Sorting Problem
implementation
,
sortings
800
x35983
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x209
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x382
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x862
1970F3
Playing Quidditch (Hard)
implementation
2300
x282
1970F2
Playing Quidditch (Medium)
implementation
2300
x274
1970F1
Playing Quidditch (Easy)
implementation
2300
x343
1970E3
Trails (Hard)
dp
,
matrices
2200
x439
1970E2
Trails (Medium)
dp
,
matrices
2000
x775
1970E1
Trails (Easy)
dp
1800
x1200
1970D3
Arithmancy (Hard)
interactive
3100
x72
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x139
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x441
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x911
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1544
1970C1
Game on Tree (Easy)
games
1400
x1961
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x342
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x528
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x745
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x358
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x362
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2873
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x150
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1030
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3653
1969C
Minimizing the Sum
dp
,
implementation
1700
x6743
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x15717
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x17293
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1504
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3396
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4339
1968E
Cells Arrangement
constructive algorithms
1600
x8532
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x12498
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x20993
1968B
Prefiquence
greedy
,
two pointers
800
x24540
1968A
Maximize?
brute force
,
math
,
number theory
800
x29016
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x40
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x68
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x142
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x493
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1395
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3302
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10813
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10121
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x12646
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x15593
1965F
Conference
data structures
,
flows
3300
x99
1965E
Connected Cubes
constructive algorithms
,
games
3100
x195
1965D
Missing Subarray Sum
constructive algorithms
2900
x295
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1536
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5478
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x11133
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