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Before contest
Educational Codeforces Round 170 (Rated for Div. 2)
13 days
→ Filter Problems
Difficulty:
—
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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Status
Standings
Custom test
Problems
#
Name
2020F
Count Leaves
dp
,
math
,
number theory
x82
2020E
Expected Power
bitmasks
,
brute force
,
dp
,
math
,
probabilities
x1808
2020D
Connect the Dots
brute force
,
dp
,
dsu
,
graphs
,
math
,
trees
x3374
2020C
Bitwise Balancing
bitmasks
,
implementation
,
math
x8105
2020B
Brightness Begins
binary search
,
math
x11450
2020A
Find Minimum Operations
bitmasks
,
brute force
,
greedy
,
math
x16129
2019B
All Pairs Segments
implementation
,
math
x10692
2019A
Max Plus Size
brute force
,
dp
,
greedy
x17597
2018F3
Speedbreaker Counting (Hard Version)
dp
,
greedy
,
math
x111
2018F2
Speedbreaker Counting (Medium Version)
dp
,
greedy
,
math
x114
2018F1
Speedbreaker Counting (Easy Version)
combinatorics
,
dp
,
greedy
,
math
x145
2018E2
Complex Segments (Hard Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
x52
2018E1
Complex Segments (Easy Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
x82
2018D
Max Plus Min Plus Size
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
matrices
x1121
2018C
Tree Pruning
brute force
,
data structures
,
dfs and similar
,
greedy
,
sortings
,
trees
x4374
2018B
Speedbreaker
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
x2650
2018A
Cards Partition
brute force
,
greedy
,
implementation
,
math
x7570
2014H
Robin Hood Archery
data structures
,
divide and conquer
,
greedy
,
hashing
1900
x2714
2014G
Milky Days
brute force
,
data structures
,
greedy
,
implementation
2200
x925
2014F
Sheriff's Defense
dfs and similar
,
dp
,
greedy
,
trees
2000
x2698
2014E
Rendez-vous de Marian et Robin
dfs and similar
,
graphs
,
shortest paths
1800
x4360
2014D
Robert Hood and Mrs Hood
brute force
,
data structures
,
greedy
,
sortings
1400
x9709
2014C
Robin Hood in Town
binary search
,
greedy
,
math
1100
x17736
2014B
Robin Hood and the Major Oak
math
800
x23811
2014A
Robin Helps
greedy
,
implementation
800
x30538
2013F2
Game in Tree (Hard Version)
binary search
,
data structures
,
trees
3500
x64
2013F1
Game in Tree (Easy Version)
binary search
,
brute force
,
data structures
,
dp
,
games
,
greedy
,
implementation
,
trees
2700
x372
2013E
Prefix GCD
brute force
,
dp
,
greedy
,
math
,
number theory
2200
x2516
2013D
Minimize the Difference
binary search
,
greedy
1900
x4960
2013C
Password Cracking
constructive algorithms
,
interactive
,
strings
1400
x10044
2013B
Battle for Survive
constructive algorithms
,
greedy
,
math
900
x19588
2013A
Zhan's Blender
constructive algorithms
,
math
800
x23706
2011I
Stack and Queue
*special problem
,
data structures
,
divide and conquer
x2
2011H
Strange Matrix
*special problem
,
graphs
,
greedy
x29
2011G
Removal of a Permutation
*special problem
x19
2011F
Good Subarray
*special problem
,
data structures
,
greedy
x87
2011E
Rock-Paper-Scissors Bot
*special problem
,
greedy
,
strings
x128
2011D
Among Wolves
*special problem
x219
2011C
Split the Expression
*special problem
x289
2011B
Shuffle
*special problem
x539
2011A
Problem Solving
*special problem
x884
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x2626
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x6097
2010B
Three Brothers
brute force
,
implementation
,
math
800
x17050
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x14333
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x270
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
2200
x1037
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3389
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x5802
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x11753
2009D
Satyam and Counting
geometry
,
math
1400
x12843
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x23206
2009B
osu!mania
brute force
,
implementation
800
x37759
2009A
Minimize!
brute force
,
math
800
x45150
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2566
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x4600
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x11499
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8841
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x17858
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x28009
2008B
Square or Not
brute force
,
math
,
strings
800
x26670
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x32406
2007C
Dora and C++
math
,
number theory
1500
x11098
2007B
Index and Maximum Value
data structures
,
greedy
900
x19567
2007A
Dora's Set
greedy
,
math
,
number theory
800
x21379
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x92
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x200
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x597
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1465
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x2930
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x6106
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
2500
x664
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
2100
x2341
2005D
Alter the GCD
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
number theory
2400
x715
2005C
Lazy Narek
dp
,
implementation
,
strings
1800
x6297
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
1200
x15345
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
1000
x17514
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
,
math
900
x19664
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x275
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x1061
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3804
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x10038
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x22190
2004B
Game with Doors
brute force
,
greedy
1000
x24478
2004A
Closest Point
implementation
,
math
800
x28945
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x366
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x477
2003E1
Turtle and Inversions (Easy Version)
brute force
,
divide and conquer
,
dp
,
greedy
,
math
2600
x674
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3747
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x10472
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x17148
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x24046
2003A
Turtle and Good Strings
greedy
,
strings
800
x27647
2002H
Counting 101
greedy
3500
x66
2002G
Lattice Optimizing
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
3400
x205
2002F2
Court Blue (Hard Version)
brute force
,
dp
,
math
,
number theory
2800
x402
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x782
2002E
Cosmic Rays
brute force
,
data structures
,
dp
2300
x2308
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2240
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4139
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