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Educational Codeforces Round 167 (Rated for Div. 2)
23:09:48
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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
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1042
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x3937
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x6683
1985F
Final Boss
binary search
,
data structures
1500
x11137
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x118
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x151
1984F
Reconstruction
brute force
,
dp
,
math
2500
x693
1984E
Shuffle
dp
,
greedy
,
trees
2400
x1062
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2581
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x5882
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x184
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x589
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1188
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4103
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x893
1980F2
Field Division (hard version)
math
,
sortings
2400
x748
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3015
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x8459
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x11796
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x211
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1064
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5304
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x867
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x2643
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x8224
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x515
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1459
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5605
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x404
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x770
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3342
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8518
1975I
Mind Bloom
dp
3500
x50
1975H
378QAQ and Core
greedy
,
strings
3500
x69
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x186
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x648
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1845
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4888
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3552
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3025
1974E
Money Buys Happiness
dp
1800
x6571
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x12720
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x13676
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x172
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x671
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1663
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7174
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1414
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x7911
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8451
1971E
Find the Car
binary search
,
math
,
sortings
1500
x11998
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x250
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x443
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1012
1970F3
Playing Quidditch (Hard)
implementation
2300
x299
1970F2
Playing Quidditch (Medium)
implementation
2300
x289
1970F1
Playing Quidditch (Easy)
implementation
2300
x360
1970E3
Trails (Hard)
dp
,
matrices
2200
x487
1970E2
Trails (Medium)
dp
,
matrices
2000
x895
1970E1
Trails (Easy)
dp
1800
x1453
1970D3
Arithmancy (Hard)
interactive
3100
x85
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x161
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x479
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1075
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1848
1970C1
Game on Tree (Easy)
games
1400
x2412
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x372
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x591
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x847
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x377
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x376
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x181
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1125
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3884
1969C
Minimizing the Sum
dp
,
implementation
1700
x7224
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1643
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3646
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4693
1968E
Cells Arrangement
constructive algorithms
1600
x9100
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x49
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x81
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x164
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x528
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1456
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3464
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x11588
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10801
1965F
Conference
data structures
,
flows
3300
x124
1965E
Connected Cubes
constructive algorithms
,
games
3100
x206
1965D
Missing Subarray Sum
constructive algorithms
2900
x314
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1606
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5784
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x11811
1958J
Necromancer
*special problem
3200
x19
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x25
1958H
Composite Spells
*special problem
,
dp
2600
x68
1958G
Observation Towers
*special problem
2400
x95
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x162
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x220
1958D
Staircase
*special problem
1600
x408
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