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Codeforces Round 997 (Div. 2)
47:49:47
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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
2057C
Trip to the Olympiad
bitmasks
,
constructive algorithms
,
greedy
,
math
1500
x9637
2053D
Refined Product Optimality
binary search
,
data structures
,
greedy
,
math
,
schedules
,
sortings
1700
x5719
2053C
Bewitching Stargazer
bitmasks
,
divide and conquer
,
dp
,
math
1500
x8936
2052F
Fix Flooded Floor
constructive algorithms
,
dp
,
graphs
1700
x1656
2052A
Adrenaline Rush
constructive algorithms
1600
x1988
2051E
Best Price
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1600
x7629
2050F
Maximum modulo equality
data structures
,
divide and conquer
,
math
,
number theory
1700
x6272
2050E
Three Strings
dp
,
implementation
,
strings
1500
x9727
2050D
Digital string maximization
brute force
,
greedy
,
math
,
strings
1300
x13963
2049C
MEX Cycle
brute force
,
constructive algorithms
,
greedy
,
implementation
1500
x9840
2049B
pspspsps
brute force
,
constructive algorithms
,
graph matchings
,
implementation
1300
x14123
2048D
Kevin and Competition Memories
binary search
,
brute force
,
data structures
,
greedy
,
sortings
,
two pointers
1600
x6270
2046B
Move Back at a Cost
binary search
,
data structures
,
greedy
,
sortings
1600
x7415
2045C
Saraga
greedy
,
strings
1400
x3666
2045A
Scrambled Scrabble
brute force
,
greedy
1700
x1442
2044G1
Medium Demon Problem (easy version)
dfs and similar
,
graph matchings
,
graphs
,
implementation
,
trees
1700
x4520
2044E
Insane Problem
binary search
,
greedy
,
implementation
,
math
,
number theory
1300
x12612
2043C
Sums on Segments
binary search
,
brute force
,
data structures
,
dp
,
greedy
,
math
1600
x7665
2041D
Drunken Maze
brute force
,
dfs and similar
,
graphs
,
shortest paths
1700
x1716
2041A
The Bento Box Adventure
implementation
,
sortings
1300
x7371
2040C
Ordered Permutations
bitmasks
,
combinatorics
,
constructive algorithms
,
greedy
,
math
,
two pointers
1600
x7927
2039D
Shohag Loves GCD
constructive algorithms
,
greedy
,
math
,
number theory
1700
x5192
2038L
Bridge Renovation
brute force
,
dp
,
greedy
,
math
,
two pointers
1400
x5093
2038C
DIY
data structures
,
geometry
,
greedy
,
sortings
1400
x4429
2038A
Bonus Project
games
,
greedy
1400
x3571
2037E
Kachina's Favorite Binary String
dp
,
greedy
,
interactive
,
two pointers
1600
x5549
2037D
Sharky Surfing
data structures
,
greedy
,
two pointers
1300
x11193
2036E
Reverse the Rivers
binary search
,
constructive algorithms
,
data structures
,
greedy
1600
x7407
2036D
I Love 1543
brute force
,
implementation
,
matrices
1300
x12896
2035C
Alya and Permutation
bitmasks
,
constructive algorithms
,
math
1400
x8952
2034D
Darius' Wisdom
constructive algorithms
,
greedy
,
implementation
,
sortings
1600
x4838
2034C
Trapped in the Witch's Labyrinth
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
1400
x6524
2033E
Sakurako, Kosuke, and the Permutation
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
1400
x10884
2033D
Kousuke's Assignment
data structures
,
dp
,
dsu
,
greedy
,
math
1300
x14292
2033C
Sakurako's Field Trip
dp
,
greedy
,
two pointers
1400
x13884
2032C
Trinity
binary search
,
math
,
sortings
,
two pointers
1400
x12655
2031D
Penchick and Desert Rabbit
binary search
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
1700
x7006
2031C
Penchick and BBQ Buns
constructive algorithms
,
math
,
number theory
1300
x12056
2030D
QED's Favorite Permutation
data structures
,
implementation
,
sortings
1700
x6703
2029C
New Rating
binary search
,
data structures
,
dp
,
greedy
1700
x5564
2028C
Alice's Adventures in Cutting Cake
binary search
,
dp
,
greedy
,
two pointers
1600
x7338
2028B
Alice's Adventures in Permuting
binary search
,
implementation
,
math
1400
x10239
2027D1
The Endspeaker (Easy Version)
binary search
,
dp
,
graphs
,
greedy
,
implementation
,
two pointers
1700
x5267
2027C
Add Zeros
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
1500
x10174
2026C
Action Figures
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x9735
2026B
Black Cells
binary search
,
brute force
,
constructive algorithms
,
greedy
1300
x13128
2025C
New Game
binary search
,
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15423
2023B
Skipping
binary search
,
dp
,
graphs
,
shortest paths
1700
x5395
2023A
Concatenation of Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1300
x13135
2022B
Kar Salesman
binary search
,
greedy
,
math
1300
x10972
2021C1
Adjust The Presentation (Easy Version)
constructive algorithms
,
greedy
1300
x11980
2020C
Bitwise Balancing
bitmasks
,
hashing
,
implementation
,
math
,
schedules
,
ternary search
1400
x15115
2018C
Tree Pruning
brute force
,
dfs and similar
,
greedy
,
sortings
,
trees
1700
x6482
2018A
Cards Partition
2-sat
,
brute force
,
greedy
,
implementation
,
math
1600
x10636
2014D
Robert Hood and Mrs Hood
brute force
,
data structures
,
greedy
,
sortings
1400
x12701
2013C
Password Cracking
constructive algorithms
,
interactive
,
strings
1400
x12112
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x3416
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x7417
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x6960
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x14196
2009D
Satyam and Counting
geometry
,
math
1400
x15310
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x13047
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x10580
2007C
Dora and C++
math
,
number theory
1500
x12856
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x7033
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x11134
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x11561
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x11013
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x13747
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x8248
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x11205
1999F
Expected Median
combinatorics
,
math
1500
x11101
1999E
Triple Operations
dp
,
implementation
,
math
1300
x19677
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x13080
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x10249
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x16522
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x9031
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x11206
1993C
Light Switches
implementation
,
math
1400
x14072
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x9410
1991C
Absolute Zero
constructive algorithms
,
greedy
,
math
1300
x15156
1990C
Mad MAD Sum
brute force
,
greedy
,
math
1500
x12124
1989C
Two Movies
greedy
,
math
1400
x19210
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x17360
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x9129
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x15667
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5850
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x9830
1985F
Final Boss
binary search
,
data structures
1500
x16077
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x7645
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x17288
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x8521
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x12929
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x7415
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x14200
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10904
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x14816
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x19118
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x11693
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x15463
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