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Before contest
Codeforces Round 950 (Div. 3)
45:04:09
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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
x48
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
x255
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
x561
1981C
Turtle and an Incomplete Sequence
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
x2533
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
x8005
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
x14489
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x355
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1111
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x4573
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x13653
1977A
Little Nikita
math
800
x22991
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
x228
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
x502
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
x2455
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
x7176
1976B
Increase/Decrease/Copy
greedy
,
implementation
x16951
1976A
Verify Password
implementation
,
sortings
x22363
1975I
Mind Bloom
dp
3500
x19
1975H
378QAQ and Core
greedy
,
strings
3500
x37
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x137
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x516
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1540
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4205
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x10591
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x13161
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x15089
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3090
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2609
1974E
Money Buys Happiness
dp
1800
x5660
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x11359
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x12198
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x25663
1974A
Phone Desktop
greedy
,
math
800
x27829
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x135
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x596
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1530
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x6550
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11348
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x20008
1972B
Coin Games
games
900
x17738
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x19624
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1250
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x7167
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x7609
1971E
Find the Car
binary search
,
math
,
sortings
1500
x10755
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x20988
1971C
Clock and Strings
implementation
900
x26197
1971B
Different String
implementation
,
strings
800
x29723
1971A
My First Sorting Problem
implementation
,
sortings
800
x35832
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x206
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x377
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x852
1970F3
Playing Quidditch (Hard)
implementation
2300
x280
1970F2
Playing Quidditch (Medium)
implementation
2300
x272
1970F1
Playing Quidditch (Easy)
implementation
2300
x341
1970E3
Trails (Hard)
dp
,
matrices
2200
x436
1970E2
Trails (Medium)
dp
,
matrices
2000
x766
1970E1
Trails (Easy)
dp
1800
x1192
1970D3
Arithmancy (Hard)
interactive
3100
x72
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x138
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x439
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x903
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1524
1970C1
Game on Tree (Easy)
games
1400
x1943
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x341
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x526
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x742
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x357
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x360
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2848
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x148
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1025
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3645
1969C
Minimizing the Sum
dp
,
implementation
1700
x6721
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x15669
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x17256
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1499
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3383
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4321
1968E
Cells Arrangement
constructive algorithms
1600
x8501
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x12458
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x20904
1968B
Prefiquence
greedy
,
two pointers
800
x24473
1968A
Maximize?
brute force
,
math
,
number theory
800
x28943
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
x1393
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3298
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10782
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10097
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x12617
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x15562
1965F
Conference
data structures
,
flows
3300
x98
1965E
Connected Cubes
constructive algorithms
,
games
3100
x195
1965D
Missing Subarray Sum
constructive algorithms
2900
x295
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1530
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5462
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x11110
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