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Codeforces Round 997 (Div. 2)
4 days
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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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Custom test
Problems
#
Name
2014A
Robin Helps
greedy
,
implementation
800
x38650
2013F2
Game in Tree (Hard Version)
binary search
,
data structures
,
trees
3500
x111
2013F1
Game in Tree (Easy Version)
binary search
,
brute force
,
data structures
,
dp
,
games
,
greedy
,
implementation
,
trees
2700
x502
2013E
Prefix GCD
brute force
,
dp
,
greedy
,
math
,
number theory
2200
x3353
2013D
Minimize the Difference
binary search
,
greedy
1900
x6294
2013C
Password Cracking
constructive algorithms
,
interactive
,
strings
1400
x12085
2013B
Battle for Survive
constructive algorithms
,
greedy
,
math
900
x24040
2013A
Zhan's Blender
constructive algorithms
,
math
800
x28108
2011I
Stack and Queue
*special problem
,
data structures
,
divide and conquer
x15
2011H
Strange Matrix
*special problem
,
graphs
,
greedy
x47
2011G
Removal of a Permutation
*special problem
x39
2011F
Good Subarray
*special problem
,
data structures
,
greedy
x117
2011E
Rock-Paper-Scissors Bot
*special problem
,
greedy
,
strings
x162
2011D
Among Wolves
*special problem
x261
2011C
Split the Expression
*special problem
x350
2011B
Shuffle
*special problem
x629
2011A
Problem Solving
*special problem
x1029
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x3407
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x7393
2010B
Three Brothers
brute force
,
implementation
,
math
800
x20813
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x17571
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x362
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
2200
x1305
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x4014
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x6942
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x14141
2009D
Satyam and Counting
geometry
,
math
1400
x15266
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x27575
2009B
osu!mania
brute force
,
implementation
800
x44322
2009A
Minimize!
brute force
,
math
800
x55227
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x3008
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x5402
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x13026
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x10552
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x19894
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x31480
2008B
Square or Not
brute force
,
math
,
strings
800
x29413
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x36355
2007C
Dora and C++
math
,
number theory
1500
x12822
2007B
Index and Maximum Value
data structures
,
greedy
900
x21956
2007A
Dora's Set
greedy
,
math
,
number theory
800
x23169
2006F
Dora's Paint
brute force
,
combinatorics
,
constructive algorithms
,
graphs
,
implementation
3500
x122
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x234
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x725
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1712
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x3486
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x7023
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
2500
x840
2005E1
Subtangle Game (Easy Version)
dp
,
games
,
greedy
,
implementation
2100
x2821
2005D
Alter the GCD
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
number theory
2400
x918
2005C
Lazy Narek
dp
,
implementation
,
strings
1800
x7296
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
1200
x18099
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
1000
x21100
2005A
Simple Palindrome
combinatorics
,
constructive algorithms
,
greedy
,
math
900
x22506
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x322
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x1214
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x4174
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x11094
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x23982
2004B
Game with Doors
brute force
,
greedy
1000
x27074
2004A
Closest Point
implementation
,
math
800
x30845
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x502
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x538
2003E1
Turtle and Inversions (Easy Version)
brute force
,
divide and conquer
,
dp
,
greedy
,
math
2600
x748
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x4099
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x11545
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x18939
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x25682
2003A
Turtle and Good Strings
greedy
,
strings
800
x29705
2002H
Counting 101
greedy
3500
x77
2002G
Lattice Optimizing
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
3400
x223
2002F2
Court Blue (Hard Version)
brute force
,
dp
,
math
,
number theory
2800
x449
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x856
2002E
Cosmic Rays
brute force
,
data structures
,
dp
2300
x2524
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2493
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4452
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x15539
2002B
Removals Game
constructive algorithms
,
games
1000
x19641
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x19796
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
dp
,
trees
2900
x230
2001E1
Deterministic Heap (Easy Version)
combinatorics
,
dp
,
math
,
trees
2400
x1327
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x5191
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10998
2001B
Generate Permutation
constructive algorithms
800
x24404
2001A
Make All Equal
greedy
,
implementation
800
x30219
2000H
Ksyusha and the Loaded Set
binary search
,
brute force
,
data structures
,
implementation
2200
x1736
2000G
Call During the Journey
binary search
,
brute force
,
graphs
,
greedy
,
shortest paths
2100
x2446
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x5551
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x13717
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x23907
2000C
Numeric String Template
data structures
,
strings
1000
x26509
2000B
Seating in a Bus
two pointers
800
x34877
2000A
Primary Task
implementation
,
math
,
strings
800
x38490
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x8230
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x11183
1999F
Expected Median
combinatorics
,
math
1500
x11071
1999E
Triple Operations
dp
,
implementation
,
math
1300
x19642
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x28200
1999C
Showering
greedy
,
implementation
800
x36453
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x34193
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