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Codeforces Round 973 (Div. 2)
13:43:39
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Difficulty:
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implementation
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
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Custom test
Problems
#
Name
2010B
Three Brothers
brute force
,
implementation
,
math
800
x14864
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x12354
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x244
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x21680
2009B
osu!mania
brute force
,
implementation
800
x35775
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8260
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x82
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x545
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
x542
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
x2009
2005D
Alter the GCD
binary search
,
data structures
,
divide and conquer
,
implementation
,
number theory
x553
2005C
Lazy Narek
dp
,
implementation
,
strings
x5557
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9798
2004A
Closest Point
implementation
,
math
800
x28436
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3639
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x18521
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4598
2001A
Make All Equal
greedy
,
implementation
800
x28126
2000H
Ksyusha and the Loaded Set
binary search
,
brute force
,
data structures
,
implementation
2200
x1486
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4908
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x21236
2000A
Primary Task
implementation
,
math
,
strings
800
x35013
1999E
Triple Operations
dp
,
implementation
,
math
1300
x17195
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x25211
1999C
Showering
greedy
,
implementation
800
x32892
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x29945
1999A
A+B Again?
implementation
,
math
800
x47530
1998E2
Eliminating Balls With Merging (Hard Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
2500
x612
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5710
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x22978
1997E
Level Up
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2200
x2656
1997A
Strong Password
brute force
,
implementation
,
strings
800
x27425
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x8921
1996B
Scale
greedy
,
implementation
800
x31289
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x7876
1995A
Diagonals
brute force
,
greedy
,
implementation
,
math
800
x23449
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x19592
1993E
Xor-Grid Problem
bitmasks
,
constructive algorithms
,
dp
,
implementation
2700
x468
1993C
Light Switches
implementation
,
math
1400
x12844
1993A
Question Marks
greedy
,
implementation
800
x28156
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x8738
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x19567
1991G
Grid Reset
constructive algorithms
,
greedy
,
implementation
2700
x520
1991F
Triangle Formation
brute force
,
greedy
,
implementation
,
math
,
sortings
2200
x2145
1991A
Maximize the Last Element
greedy
,
implementation
800
x20970
1990D
Grid Puzzle
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
1800
x5907
1989A
Catch the Coin
implementation
800
x25622
1988E
Range Minimum Sum
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2300
x1318
1988B
Make Majority
greedy
,
implementation
900
x21606
1988A
Split the Multiset
brute force
,
greedy
,
implementation
,
math
900
x22085
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
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5358
1985D
Manhattan Circle
implementation
,
math
900
x33254
1985A
Creating Words
implementation
,
strings
800
x50575
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x249
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x3111
1984B
Large Addition
implementation
,
math
1100
x17703
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
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6819
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x16350
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x24259
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x5090
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10055
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x13800
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1384
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x28473
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3612
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x10782
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x14377
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x4144
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9980
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x21721
1976A
Verify Password
implementation
,
sortings
,
strings
800
x27910
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x2190
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x18221
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3449
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x14319
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x29541
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x202
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8074
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x23751
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9583
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25222
1971C
Clock and Strings
implementation
900
x31747
1971B
Different String
implementation
,
strings
800
x35766
1971A
My First Sorting Problem
implementation
,
sortings
800
x43375
1970F3
Playing Quidditch (Hard)
implementation
2300
x337
1970F2
Playing Quidditch (Medium)
implementation
2300
x328
1970F1
Playing Quidditch (Easy)
implementation
2300
x408
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x4281
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x250
1969C
Minimizing the Sum
dp
,
implementation
1700
x8392
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x19567
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x63
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x630
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x12121
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14644
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17567
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