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Codeforces Round 978 (Div. 2)
3 days
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Difficulty:
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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
2021E3
Digital Village (Extreme Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
math
,
trees
x244
2021E2
Digital Village (Hard Version)
data structures
,
dp
,
dsu
,
graphs
,
math
,
trees
x498
2021E1
Digital Village (Easy Version)
brute force
,
data structures
,
dp
,
dsu
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
,
trees
x1046
2021D
Boss, Thirsty
dp
,
greedy
,
implementation
x361
2021C2
Adjust The Presentation (Hard Version)
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
x2605
2021C1
Adjust The Presentation (Easy Version)
constructive algorithms
,
greedy
x8910
2021B
Maximize Mex
brute force
,
greedy
,
math
,
number theory
x10761
2021A
Meaning Mean
data structures
,
greedy
,
math
,
sortings
x14873
2020F
Count Leaves
dp
,
math
,
number theory
2900
x142
2020E
Expected Power
bitmasks
,
dp
,
math
,
probabilities
2000
x2503
2020D
Connect the Dots
brute force
,
dp
,
dsu
,
graphs
,
math
,
trees
1800
x4686
2020C
Bitwise Balancing
bitmasks
,
hashing
,
implementation
,
math
,
schedules
,
ternary search
1400
x10369
2020B
Brightness Begins
binary search
,
math
1200
x14152
2020A
Find Minimum Operations
bitmasks
,
brute force
,
greedy
,
math
,
number theory
800
x19482
2019B
All Pairs Segments
implementation
,
math
1200
x12347
2019A
Max Plus Size
brute force
,
dp
,
greedy
800
x20340
2018F3
Speedbreaker Counting (Hard Version)
dp
,
greedy
,
math
3100
x137
2018F2
Speedbreaker Counting (Medium Version)
dp
,
greedy
,
math
3000
x136
2018F1
Speedbreaker Counting (Easy Version)
combinatorics
,
dp
,
greedy
,
math
2900
x172
2018E2
Complex Segments (Hard Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
3400
x70
2018E1
Complex Segments (Easy Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
3300
x106
2018D
Max Plus Min Plus Size
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
matrices
,
sortings
2200
x1343
2018C
Tree Pruning
brute force
,
dfs and similar
,
greedy
,
sortings
,
trees
1700
x5202
2018B
Speedbreaker
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1900
x3263
2018A
Cards Partition
2-sat
,
brute force
,
greedy
,
implementation
,
math
1600
x8846
2014H
Robin Hood Archery
data structures
,
divide and conquer
,
greedy
,
hashing
1900
x3024
2014G
Milky Days
brute force
,
data structures
,
greedy
,
implementation
2200
x1069
2014F
Sheriff's Defense
dfs and similar
,
dp
,
greedy
,
trees
2000
x3060
2014E
Rendez-vous de Marian et Robin
dfs and similar
,
graphs
,
shortest paths
1800
x4887
2014D
Robert Hood and Mrs Hood
brute force
,
data structures
,
greedy
,
sortings
1400
x10640
2014C
Robin Hood in Town
binary search
,
greedy
,
math
1100
x19208
2014B
Robin Hood and the Major Oak
math
800
x25487
2014A
Robin Helps
greedy
,
implementation
800
x32835
2013F2
Game in Tree (Hard Version)
binary search
,
data structures
,
trees
3500
x81
2013F1
Game in Tree (Easy Version)
binary search
,
brute force
,
data structures
,
dp
,
games
,
greedy
,
implementation
,
trees
2700
x414
2013E
Prefix GCD
brute force
,
dp
,
greedy
,
math
,
number theory
2200
x2777
2013D
Minimize the Difference
binary search
,
greedy
1900
x5365
2013C
Password Cracking
constructive algorithms
,
interactive
,
strings
1400
x10693
2013B
Battle for Survive
constructive algorithms
,
greedy
,
math
900
x20899
2013A
Zhan's Blender
constructive algorithms
,
math
800
x25000
2011I
Stack and Queue
*special problem
,
data structures
,
divide and conquer
x4
2011H
Strange Matrix
*special problem
,
graphs
,
greedy
x33
2011G
Removal of a Permutation
*special problem
x24
2011F
Good Subarray
*special problem
,
data structures
,
greedy
x95
2011E
Rock-Paper-Scissors Bot
*special problem
,
greedy
,
strings
x143
2011D
Among Wolves
*special problem
x244
2011C
Split the Expression
*special problem
x326
2011B
Shuffle
*special problem
x591
2011A
Problem Solving
*special problem
x951
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x2765
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x6347
2010B
Three Brothers
brute force
,
implementation
,
math
800
x17799
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x15024
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x285
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
2200
x1080
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3492
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x6011
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x12148
2009D
Satyam and Counting
geometry
,
math
1400
x13217
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x23930
2009B
osu!mania
brute force
,
implementation
800
x38673
2009A
Minimize!
brute force
,
math
800
x46535
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2653
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x4749
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x11765
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x9172
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x18200
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x28540
2008B
Square or Not
brute force
,
math
,
strings
800
x27127
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x33020
2007C
Dora and C++
math
,
number theory
1500
x11430
2007B
Index and Maximum Value
data structures
,
greedy
900
x20094
2007A
Dora's Set
greedy
,
math
,
number theory
800
x21809
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x98
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x206
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x612
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1528
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x3066
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x6300
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
2500
x704
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
2100
x2475
2005D
Alter the GCD
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
number theory
2400
x765
2005C
Lazy Narek
dp
,
implementation
,
strings
1800
x6541
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
1200
x16012
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
1000
x18366
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
,
math
900
x20365
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x281
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x1092
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3867
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x10227
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x22499
2004B
Game with Doors
brute force
,
greedy
1000
x24880
2004A
Closest Point
implementation
,
math
800
x29298
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x379
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x491
2003E1
Turtle and Inversions (Easy Version)
brute force
,
divide and conquer
,
dp
,
greedy
,
math
2600
x690
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3820
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x10633
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x17415
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x24375
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