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Before contest
Codeforces Round (Div. 2)
7 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
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Custom test
Problems
#
Name
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x1648
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x4192
2010B
Three Brothers
brute force
,
implementation
,
math
800
x9591
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x8356
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
,
trees
x170
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
x649
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
two pointers
x2195
2009F
Firefly's Queries
data structures
,
math
x4125
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
x8689
2009D
Satyam and Counting
geometry
,
math
x9673
2009C
The Legend of Freya the Frog
implementation
,
math
x17923
2009B
osu!mania
brute force
,
implementation
x30842
2009A
Minimize!
brute force
,
math
x36232
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
x1951
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
x3554
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
x10078
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
x7356
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
x16134
2008C
Longest Good Array
binary search
,
brute force
,
math
x25138
2008B
Square or Not
brute force
,
math
,
strings
x24212
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
x28956
2007C
Dora and C++
math
,
number theory
1500
x8963
2007B
Index and Maximum Value
data structures
,
greedy
900
x16511
2007A
Dora's Set
greedy
,
math
,
number theory
800
x18643
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x52
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x151
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x447
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1161
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x2271
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x4865
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x247
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x919
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3504
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9408
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x20800
2004B
Game with Doors
brute force
,
greedy
1000
x22894
2004A
Closest Point
implementation
,
math
800
x27493
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x311
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x410
2003E1
Turtle and Inversions (Easy Version)
brute force
,
divide and conquer
,
dp
,
greedy
,
math
2600
x579
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3389
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x9651
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x15760
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x22483
2003A
Turtle and Good Strings
greedy
,
strings
800
x25789
2002H
Counting 101
greedy
3500
x56
2002G
Lattice Optimizing
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
3400
x164
2002F2
Court Blue (Hard Version)
brute force
,
dp
,
math
,
number theory
2800
x366
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x728
2002E
Cosmic Rays
brute force
,
data structures
,
dp
2300
x2097
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2058
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x3906
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x13547
2002B
Removals Game
constructive algorithms
,
games
1000
x16673
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x18018
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
dp
,
trees
2900
x164
2001E1
Deterministic Heap (Easy Version)
combinatorics
,
dp
,
math
,
trees
2400
x1045
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4320
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x9649
2001B
Generate Permutation
constructive algorithms
800
x22424
2001A
Make All Equal
greedy
,
implementation
800
x27280
2000H
Ksyusha and the Loaded Set
binary search
,
brute force
,
data structures
,
implementation
2200
x1406
2000G
Call During the Journey
binary search
,
brute force
,
graphs
,
greedy
,
shortest paths
2100
x1942
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4704
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x11945
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x20651
2000C
Numeric String Template
data structures
,
strings
1000
x23105
2000B
Seating in a Bus
two pointers
800
x31234
2000A
Primary Task
implementation
,
math
,
strings
800
x34187
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x6759
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x9150
1999F
Expected Median
combinatorics
,
math
1500
x9128
1999E
Triple Operations
dp
,
implementation
,
math
1300
x16571
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x24722
1999C
Showering
greedy
,
implementation
800
x32356
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x29119
1999A
A+B Again?
implementation
,
math
800
x46017
1998E2
Eliminating Balls With Merging (Hard Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
2500
x572
1998E1
Eliminating Balls With Merging (Easy Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
2200
x1592
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2851
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5497
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x21750
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x22492
1997F
Chips on a Line
brute force
,
combinatorics
,
dp
,
greedy
,
math
2700
x802
1997E
Level Up
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2200
x2581
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x11338
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x20191
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x19391
1997A
Strong Password
brute force
,
implementation
,
strings
800
x26959
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1452
1996F
Bomb
binary search
,
greedy
,
math
1900
x4160
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x8681
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x14551
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x21205
1996B
Scale
greedy
,
implementation
800
x30891
1996A
Legs
binary search
,
math
,
ternary search
800
x38982
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x269
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x337
1995D
Cases
bitmasks
,
brute force
,
dp
,
strings
2300
x2125
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x7675
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