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Before contest
Codeforces Round 973 (Div. 2)
16:03:52
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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
x2286
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x5455
2010B
Three Brothers
brute force
,
implementation
,
math
800
x14854
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x12345
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x244
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
x3071
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x5364
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x10890
2009D
Satyam and Counting
geometry
,
math
1400
x12030
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x21673
2009B
osu!mania
brute force
,
implementation
800
x35768
2009A
Minimize!
brute force
,
math
800
x42373
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2360
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x4224
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x10939
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8260
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x17097
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x26789
2008B
Square or Not
brute force
,
math
,
strings
800
x25614
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x31048
2007C
Dora and C++
math
,
number theory
1500
x10496
2007B
Index and Maximum Value
data structures
,
greedy
900
x18668
2007A
Dora's Set
greedy
,
math
,
number theory
800
x20651
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
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x544
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1378
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x2741
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x5735
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
x542
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
x2008
2005D
Alter the GCD
binary search
,
data structures
,
divide and conquer
,
implementation
,
number theory
x552
2005C
Lazy Narek
dp
,
implementation
,
strings
x5549
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
x13998
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
x16071
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
x18141
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
x3694
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9797
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x21615
2004B
Game with Doors
brute force
,
greedy
1000
x23831
2004A
Closest Point
implementation
,
math
800
x28435
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
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3638
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x10220
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x16692
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x23499
2003A
Turtle and Good Strings
greedy
,
strings
800
x27030
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
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
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2190
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4070
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x13997
2002B
Removals Game
constructive algorithms
,
games
1000
x17252
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x18519
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
dp
,
trees
2900
x180
2001E1
Deterministic Heap (Easy Version)
combinatorics
,
dp
,
math
,
trees
2400
x1119
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4597
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10000
2001B
Generate Permutation
constructive algorithms
800
x23006
2001A
Make All Equal
greedy
,
implementation
800
x28125
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
x2024
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4908
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x12303
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x21236
2000C
Numeric String Template
data structures
,
strings
1000
x23717
2000B
Seating in a Bus
two pointers
800
x31930
2000A
Primary Task
implementation
,
math
,
strings
800
x35010
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x6948
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x9371
1999F
Expected Median
combinatorics
,
math
1500
x9536
1999E
Triple Operations
dp
,
implementation
,
math
1300
x17195
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x25211
1999C
Showering
greedy
,
implementation
800
x32891
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x29944
1999A
A+B Again?
implementation
,
math
800
x47529
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
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2975
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5710
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x22340
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x22975
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
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x11638
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x20549
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x19688
1997A
Strong Password
brute force
,
implementation
,
strings
800
x27422
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1506
1996F
Bomb
binary search
,
greedy
,
math
1900
x4331
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x8921
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x14834
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