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Codeforces Round 973 (Div. 2)
13:34:45
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Difficulty:
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dp
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
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x244
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
2200
x911
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8260
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x17101
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
x542
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
x2009
2005C
Lazy Narek
dp
,
implementation
,
strings
x5558
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x265
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x346
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x451
2003E1
Turtle and Inversions (Easy Version)
brute force
,
divide and conquer
,
dp
,
greedy
,
math
2600
x638
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3639
2002F2
Court Blue (Hard Version)
brute force
,
dp
,
math
,
number theory
2800
x389
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x763
2002E
Cosmic Rays
brute force
,
data structures
,
dp
2300
x2233
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
dp
,
trees
2900
x181
2001E1
Deterministic Heap (Easy Version)
combinatorics
,
dp
,
math
,
trees
2400
x1119
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4908
1999E
Triple Operations
dp
,
implementation
,
math
1300
x17195
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2975
1997F
Chips on a Line
brute force
,
combinatorics
,
dp
,
greedy
,
math
2700
x830
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x11638
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x21607
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x281
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x354
1995D
Cases
bitmasks
,
brute force
,
dp
,
strings
2300
x2192
1994G
Minecraft
bitmasks
,
brute force
,
dp
,
graphs
,
math
2600
x1154
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x10055
1993E
Xor-Grid Problem
bitmasks
,
constructive algorithms
,
dp
,
implementation
2700
x468
1993D
Med-imize
binary search
,
dp
,
greedy
2200
x3474
1992G
Ultra-Meow
combinatorics
,
dp
,
math
2000
x2894
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5449
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x19567
1991H
Prime Split Game
bitmasks
,
dp
,
fft
,
games
,
math
,
number theory
3300
x256
1990F
Polygonal Segments
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
two pointers
2800
x256
1990D
Grid Puzzle
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
1800
x5907
1989E
Distance to Different
combinatorics
,
dp
,
math
2300
x1841
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5667
1988F
Heartbeat
combinatorics
,
dp
,
fft
,
math
3000
x180
1988D
The Omnipotent Monster Killer
brute force
,
dfs and similar
,
dp
,
trees
2000
x4650
1987G2
Spinning Round (Hard Version)
divide and conquer
,
dp
,
trees
3500
x147
1987G1
Spinning Round (Easy Version)
divide and conquer
,
dp
,
trees
2900
x252
1987F2
Interesting Problem (Hard Version)
dp
2600
x967
1987F1
Interesting Problem (Easy Version)
dp
2500
x1076
1987D
World is Mine
dp
,
games
1800
x6801
1987C
Basil's Garden
dp
,
greedy
1200
x16648
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x14672
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1457
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x164
1984F
Reconstruction
brute force
,
dp
,
math
2500
x894
1984E
Shuffle
dp
,
greedy
,
trees
2400
x1343
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x7034
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x15908
1983G
Your Loss
bitmasks
,
brute force
,
dp
,
trees
3000
x203
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1499
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x16737
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x246
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6360
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3612
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6505
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x523
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9980
1975I
Mind Bloom
dp
3500
x82
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x784
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5757
1974E
Money Buys Happiness
dp
1800
x7647
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x202
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x23751
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25223
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x316
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x546
1970E3
Trails (Hard)
dp
,
matrices
2200
x684
1970E2
Trails (Medium)
dp
,
matrices
2000
x1186
1970E1
Trails (Easy)
dp
1800
x1997
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1432
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2491
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x250
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1305
1969C
Minimizing the Sum
dp
,
implementation
1700
x8392
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1872
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4099
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x99
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x209
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1666
1958H
Composite Spells
*special problem
,
dp
2600
x73
1958A
1-3-5
*special problem
,
dp
1100
x1839
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1218
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4354
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x9374
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3795
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1213
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4358
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6889
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x242
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5916
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x267
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4221
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x22783
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1639
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x101
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