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Codeforces Round 973 (Div. 2)
13:48:21
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Difficulty:
—
greedy
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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Standings
Custom test
Problems
#
Name
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2362
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x4224
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8260
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x31052
2007B
Index and Maximum Value
data structures
,
greedy
900
x18672
2007A
Dora's Set
greedy
,
math
,
number theory
800
x20653
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x545
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x5736
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
x542
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
x2009
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
x14004
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
x16079
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
x18159
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x989
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9798
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x21615
2004B
Game with Doors
brute force
,
greedy
1000
x23832
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
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x10222
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x16693
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x23500
2003A
Turtle and Good Strings
greedy
,
strings
800
x27030
2002H
Counting 101
greedy
3500
x61
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x13999
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4598
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10001
2001A
Make All Equal
greedy
,
implementation
800
x28126
2000G
Call During the Journey
binary search
,
brute force
,
graphs
,
greedy
,
shortest paths
2100
x2024
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4908
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x12303
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x21236
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x25211
1999C
Showering
greedy
,
implementation
800
x32892
1998E2
Eliminating Balls With Merging (Hard Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
2500
x612
1998E1
Eliminating Balls With Merging (Easy Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
2200
x1675
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2975
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5710
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
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x20550
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1506
1996F
Bomb
binary search
,
greedy
,
math
1900
x4331
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x21607
1996B
Scale
greedy
,
implementation
800
x31289
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x7876
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8279
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17041
1995A
Diagonals
brute force
,
greedy
,
implementation
,
math
800
x23448
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x490
1994E
Wooden Game
bitmasks
,
greedy
,
math
,
trees
2000
x4199
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5409
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15867
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x19592
1993D
Med-imize
binary search
,
dp
,
greedy
2200
x3474
1993B
Parity and Sum
constructive algorithms
,
greedy
1100
x21649
1993A
Question Marks
greedy
,
implementation
800
x28156
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5449
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x19567
1992B
Angry Monk
greedy
,
math
,
sortings
800
x32946
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x39322
1991I
Grid Game
constructive algorithms
,
games
,
graph matchings
,
greedy
,
interactive
3500
x59
1991G
Grid Reset
constructive algorithms
,
greedy
,
implementation
2700
x520
1991F
Triangle Formation
brute force
,
greedy
,
implementation
,
math
,
sortings
2200
x2145
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x3958
1991D
Prime XOR Coloring
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
1900
x6104
1991C
Absolute Zero
constructive algorithms
,
greedy
,
math
1300
x13605
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x15646
1991A
Maximize the Last Element
greedy
,
implementation
800
x20970
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
1990C
Mad MAD Sum
brute force
,
greedy
,
math
1500
x10900
1990B
Array Craft
constructive algorithms
,
greedy
1200
x15659
1990A
Submission Bait
brute force
,
games
,
greedy
,
sortings
900
x21336
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5667
1989C
Two Movies
greedy
,
math
1400
x17661
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x19395
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x15720
1988B
Make Majority
greedy
,
implementation
900
x21606
1988A
Split the Multiset
brute force
,
greedy
,
implementation
,
math
900
x22085
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x3198
1987C
Basil's Garden
dp
,
greedy
1200
x16648
1987B
K-Sort
greedy
1000
x19459
1987A
Upload More RAM
greedy
,
math
800
x24339
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x8365
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x14672
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x22207
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x25821
1985C
Good Prefixes
greedy
1000
x31058
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
1983F
array-value
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
2500
x1105
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x7864
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x11927
1983B
Corner Twist
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15549
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x16737
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x24259
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