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Before contest
Codeforces Round 973 (Div. 2)
21:33:11
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combine-tags-by-or
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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
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x2277
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x5427
2010B
Three Brothers
brute force
,
implementation
,
math
800
x14750
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x12269
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x243
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
2200
x910
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3061
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x5352
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x10858
2009D
Satyam and Counting
geometry
,
math
1400
x12003
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x21619
2009B
osu!mania
brute force
,
implementation
800
x35701
2009A
Minimize!
brute force
,
math
800
x42297
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2352
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x4212
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x10923
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8240
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x17078
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x26745
2008B
Square or Not
brute force
,
math
,
strings
800
x25584
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x31008
2007C
Dora and C++
math
,
number theory
1500
x10477
2007B
Index and Maximum Value
data structures
,
greedy
900
x18637
2007A
Dora's Set
greedy
,
math
,
number theory
800
x20629
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x80
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x184
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x542
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1375
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x2736
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x5719
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
x537
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
x1987
2005D
Alter the GCD
binary search
,
data structures
,
divide and conquer
,
implementation
,
number theory
x545
2005C
Lazy Narek
dp
,
implementation
x5515
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
x13926
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
x15998
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
x18061
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x265
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x988
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3692
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9791
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x21600
2004B
Game with Doors
brute force
,
greedy
1000
x23809
2004A
Closest Point
implementation
,
math
800
x28418
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
x637
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3636
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x10212
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x16682
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x23488
2003A
Turtle and Good Strings
greedy
,
strings
800
x27014
2002H
Counting 101
greedy
3500
x61
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
x388
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
x2230
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2189
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4067
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x13992
2002B
Removals Game
constructive algorithms
,
games
1000
x17245
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x18509
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
dp
,
trees
2900
x180
2001E1
Deterministic Heap (Easy Version)
combinatorics
,
dp
,
math
,
trees
2400
x1117
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4592
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x9996
2001B
Generate Permutation
constructive algorithms
800
x22994
2001A
Make All Equal
greedy
,
implementation
800
x28116
2000H
Ksyusha and the Loaded Set
binary search
,
brute force
,
data structures
,
implementation
2200
x1485
2000G
Call During the Journey
binary search
,
brute force
,
graphs
,
greedy
,
shortest paths
2100
x2021
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4906
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x12296
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x21223
2000C
Numeric String Template
data structures
,
strings
1000
x23706
2000B
Seating in a Bus
two pointers
800
x31919
2000A
Primary Task
implementation
,
math
,
strings
800
x34993
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x6944
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x9364
1999F
Expected Median
combinatorics
,
math
1500
x9532
1999E
Triple Operations
dp
,
implementation
,
math
1300
x17189
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x25205
1999C
Showering
greedy
,
implementation
800
x32886
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x29936
1999A
A+B Again?
implementation
,
math
800
x47509
1998E2
Eliminating Balls With Merging (Hard Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
2500
x611
1998E1
Eliminating Balls With Merging (Easy Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
2200
x1673
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2974
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5707
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x22330
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x22965
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
x2655
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x11632
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x20545
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x19684
1997A
Strong Password
brute force
,
implementation
,
strings
800
x27421
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1504
1996F
Bomb
binary search
,
greedy
,
math
1900
x4327
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x8914
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x14830
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