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Codeforces Round 973 (Div. 2)
13:50:51
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Difficulty:
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brute force
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
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x5455
2010B
Three Brothers
brute force
,
implementation
,
math
800
x14864
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x12354
2009B
osu!mania
brute force
,
implementation
800
x35774
2009A
Minimize!
brute force
,
math
800
x42381
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2362
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8260
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x26789
2008B
Square or Not
brute force
,
math
,
strings
800
x25620
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x31052
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x82
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x184
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x2741
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x989
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3694
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9798
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
2002G
Lattice Optimizing
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
3400
x196
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
x2232
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4071
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
2000H
Ksyusha and the Loaded Set
binary search
,
brute force
,
data structures
,
implementation
2200
x1486
2000G
Call During the Journey
binary search
,
brute force
,
graphs
,
greedy
,
shortest paths
2100
x2024
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x29945
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
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
1997E
Level Up
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2200
x2656
1997A
Strong Password
brute force
,
implementation
,
strings
800
x27425
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1506
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x14834
1995D
Cases
bitmasks
,
brute force
,
dp
,
strings
2300
x2192
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x7876
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17041
1995A
Diagonals
brute force
,
greedy
,
implementation
,
math
800
x23448
1994G
Minecraft
bitmasks
,
brute force
,
dp
,
graphs
,
math
2600
x1154
1993F1
Dyn-scripted Robot (Easy Version)
brute force
,
chinese remainder theorem
,
constructive algorithms
,
math
,
number theory
2400
x913
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5449
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x8738
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x39322
1991F
Triangle Formation
brute force
,
greedy
,
implementation
,
math
,
sortings
2200
x2145
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
1990A
Submission Bait
brute force
,
games
,
greedy
,
sortings
900
x21335
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5667
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x19395
1988E
Range Minimum Sum
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2300
x1318
1988D
The Omnipotent Monster Killer
brute force
,
dfs and similar
,
dp
,
trees
2000
x4650
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
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x1010
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1398
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x14672
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x25821
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x38862
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5358
1985E
Secret Box
brute force
,
combinatorics
,
math
1200
x19290
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x44210
1984F
Reconstruction
brute force
,
dp
,
math
2500
x894
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x3111
1983G
Your Loss
bitmasks
,
brute force
,
dp
,
trees
3000
x203
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x11927
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1499
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
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x5090
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x21744
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x302
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6360
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x28473
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3612
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1758
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6505
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
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x14051
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x17274
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
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x202
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1860
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x23751
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x22523
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9583
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x546
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x569
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x419
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1872
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14494
1968A
Maximize?
brute force
,
math
,
number theory
800
x33193
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x63
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