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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
Standings
Custom test
Problems
#
Name
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7994
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7832
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19409
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8851
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9956
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x12053
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x17026
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10293
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7401
1404A
Balanced Bitstring
implementation
,
strings
1500
x15433
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1189
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9320
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x24294
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x10274
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x17335
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11193
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x18278
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x11487
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x26431
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14703
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x11400
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15439
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x14122
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6770
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10628
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16703
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8944
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x15018
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x19021
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16772
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9722
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x19310
1384B1
Koa and the Beach (Easy Version)
brute force
,
dp
,
greedy
1900
x3901
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x5054
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10651
1381B
Unmerge
dp
1800
x8906
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13291
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20498
1380C
Create The Teams
brute force
,
dp
,
greedy
,
implementation
,
sortings
1400
x20732
1380B
Universal Solution
greedy
1400
x14606
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12669
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11927
1375D
Replace by MEX
brute force
,
constructive algorithms
,
sortings
1900
x9188
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x21152
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x14036
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x23775
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15616
1373C
Pluses and Minuses
math
1300
x18358
1372C
Omkar and Baseball
constructive algorithms
,
math
1500
x17840
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x28045
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x5236
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12989
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20540
1370C
Number Game
games
,
math
,
number theory
1400
x24582
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8617
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19589
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11813
1368C
Even Picture
constructive algorithms
1500
x13388
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19757
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5455
1367D
Task On The Board
constructive algorithms
,
greedy
,
implementation
,
sortings
1800
x8341
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x23496
1366C
Palindromic Paths
greedy
,
math
1500
x13579
1366B
Shuffle
math
,
two pointers
1300
x21037
1365E
Maximum Subsequence Value
brute force
,
constructive algorithms
1900
x7836
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17315
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x23112
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x26861
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x13175
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x19887
1363C
Game On Leaves
games
,
trees
1600
x18726
1363B
Subsequence Hate
implementation
,
strings
1400
x23628
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x18344
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3623
1361A
Johnny and Contribution
constructive algorithms
,
graphs
,
greedy
,
sortings
1700
x8427
1360G
A/B Matrix
constructive algorithms
,
greedy
,
math
1900
x7767
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12411
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x25306
1360D
Buying Shovels
math
,
number theory
1300
x33209
1359C
Mixing Water
binary search
,
math
1700
x13828
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8160
1358C
Celex Update
math
1600
x17388
1355D
Game With Array
constructive algorithms
,
math
1400
x18034
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10653
1354D
Multiset
binary search
,
data structures
1900
x8778
1354C1
Simple Polygon Embedding
binary search
,
geometry
,
math
,
ternary search
1400
x15688
1353E
K-periodic Garland
brute force
,
dp
,
greedy
1900
x7149
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x18116
1352G
Special Permutation
constructive algorithms
1600
x21231
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x17142
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x20550
1352D
Alice, Bob and Candies
implementation
1300
x26199
1351C
Skier
data structures
,
implementation
1400
x8553
1350B
Orac and Models
dp
,
math
,
number theory
1400
x22182
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x17096
1348D
Phoenix and Science
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x8853
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14622
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x25344
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x378
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x502
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