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Codeforces Round sponsored by NEAR (Div. 1 + Div. 2)
24:16:54
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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
#
Name
1992G
Ultra-Meow
combinatorics
,
dp
,
math
2000
x1911
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x4059
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x6919
1989F
Simultaneous Coloring
dfs and similar
,
divide and conquer
,
graphs
3000
x249
1989E
Distance to Different
combinatorics
,
dp
,
math
2300
x1465
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x4720
1987H
Fumo Temple
interactive
3500
x62
1987G2
Spinning Round (Hard Version)
divide and conquer
,
dp
,
trees
3500
x75
1987G1
Spinning Round (Easy Version)
divide and conquer
,
dp
,
trees
2900
x184
1987F2
Interesting Problem (Hard Version)
dp
2600
x778
1987F1
Interesting Problem (Easy Version)
dp
2500
x883
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x2629
1987D
World is Mine
dp
,
games
1800
x5723
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x827
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1180
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x3563
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x7202
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1233
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x4541
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x141
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x201
1984F
Reconstruction
brute force
,
dp
,
math
2500
x791
1984E
Shuffle
dp
,
greedy
,
trees
2400
x1206
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2803
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x6392
1983G
Your Loss
bitmasks
,
brute force
,
dp
,
trees
3000
x151
1983F
array-value
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
2500
x893
1983E
I Love Balls
combinatorics
,
math
,
probabilities
2300
x1591
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x6724
1982F
Sorting Problem Again
binary search
,
data structures
,
sortings
2600
x771
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1301
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x5984
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x204
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x691
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1338
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4508
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x1000
1980F2
Field Division (hard version)
math
,
sortings
2400
x844
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3284
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x248
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1211
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5773
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1094
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3157
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x564
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1592
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5936
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x463
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x856
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3621
1975I
Mind Bloom
dp
3500
x65
1975H
378QAQ and Core
greedy
,
strings
3500
x85
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x199
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x712
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1983
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5240
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3732
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3176
1974E
Money Buys Happiness
dp
1800
x6928
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x181
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x706
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1719
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7497
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1503
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8194
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x264
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x466
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1101
1970F3
Playing Quidditch (Hard)
implementation
2300
x312
1970F2
Playing Quidditch (Medium)
implementation
2300
x306
1970F1
Playing Quidditch (Easy)
implementation
2300
x380
1970E3
Trails (Hard)
dp
,
matrices
2200
x550
1970E2
Trails (Medium)
dp
,
matrices
2000
x969
1970E1
Trails (Easy)
dp
1800
x1617
1970D3
Arithmancy (Hard)
interactive
3100
x88
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x167
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x506
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1201
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2054
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x393
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x642
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x908
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x396
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x387
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x210
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1181
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4030
1969C
Minimizing the Sum
dp
,
implementation
1700
x7622
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1722
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3804
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4873
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x51
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x85
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x171
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x554
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1503
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3563
1965F
Conference
data structures
,
flows
3300
x133
1965E
Connected Cubes
constructive algorithms
,
games
3100
x215
1965D
Missing Subarray Sum
constructive algorithms
2900
x334
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