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Before contest
Educational Codeforces Round 166 (Rated for Div. 2)
39:47:42
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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
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
x258
1977D
XORificator
bitmasks
,
brute force
,
hashing
x831
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
x3771
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
x12398
1977A
Little Nikita
math
x20579
1975I
Mind Bloom
dp
x13
1975H
378QAQ and Core
greedy
,
strings
x25
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
x106
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
x448
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
x1388
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
x3891
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
x9917
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
x12436
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
x14386
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x2887
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2434
1974E
Money Buys Happiness
dp
1800
x5351
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x10883
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x11643
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x24827
1974A
Phone Desktop
greedy
,
math
800
x26894
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x123
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x567
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1478
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x6358
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11028
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x19569
1972B
Coin Games
games
900
x17456
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x19311
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1209
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x6971
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x7427
1971E
Find the Car
binary search
,
math
,
sortings
1500
x10533
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x20594
1971C
Clock and Strings
implementation
900
x25741
1971B
Different String
implementation
,
strings
800
x29234
1971A
My First Sorting Problem
implementation
,
sortings
800
x35182
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x203
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x370
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x823
1970F3
Playing Quidditch (Hard)
implementation
2300
x276
1970F2
Playing Quidditch (Medium)
implementation
2300
x267
1970F1
Playing Quidditch (Easy)
implementation
2300
x337
1970E3
Trails (Hard)
dp
,
matrices
2200
x427
1970E2
Trails (Medium)
dp
,
matrices
2000
x748
1970E1
Trails (Easy)
dp
1800
x1146
1970D3
Arithmancy (Hard)
interactive
3100
x69
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x134
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x431
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x877
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1445
1970C1
Game on Tree (Easy)
games
1400
x1857
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x331
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x517
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x726
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x351
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x352
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2676
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x130
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1012
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3569
1969C
Minimizing the Sum
dp
,
implementation
1700
x6575
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x15296
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x16884
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1481
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3342
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4257
1968E
Cells Arrangement
constructive algorithms
1600
x8388
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x12313
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x20598
1968B
Prefiquence
greedy
,
two pointers
800
x24174
1968A
Maximize?
brute force
,
math
,
number theory
800
x28567
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x36
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x65
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x133
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x477
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1381
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3268
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10620
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9937
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x12424
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x15400
1965F
Conference
data structures
,
flows
3300
x92
1965E
Connected Cubes
constructive algorithms
,
games
3100
x189
1965D
Missing Subarray Sum
constructive algorithms
2900
x290
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1517
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5394
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10977
1958J
Necromancer
*special problem
3200
x15
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x21
1958H
Composite Spells
*special problem
,
dp
2600
x64
1958G
Observation Towers
*special problem
2400
x91
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x151
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x205
1958D
Staircase
*special problem
1600
x358
1958C
Firewood
*special problem
1500
x483
1958B
Clock in the Pool
*special problem
,
math
1400
x660
1958A
1-3-5
*special problem
,
dp
1100
x1105
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x300
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x360
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