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Before contest
Codeforces Round 973 (Div. 2)
14:32:29
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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
#
Name
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8781
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10883
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15953
1425H
Huge Boxes of Animal Toys
constructive algorithms
1300
x4152
1425F
Flamingoes of Mystery
interactive
1400
x5642
1425A
Arena of Greed
games
,
greedy
1400
x6501
1424G
Years
data structures
,
sortings
1300
x5803
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4831
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8212
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14387
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12773
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17557
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15515
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15346
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x19738
1418B
Negative Prefixes
greedy
,
sortings
1300
x16652
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12468
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10855
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6483
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7966
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19346
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8832
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9936
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11963
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16987
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10243
1404A
Balanced Bitstring
implementation
,
strings
1500
x15346
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x24209
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x17284
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11170
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x18227
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x26198
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14682
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15412
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x14072
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10604
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16657
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8912
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14988
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18978
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16688
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x19231
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10567
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13262
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20446
1380C
Create The Teams
brute force
,
dp
,
greedy
,
implementation
,
sortings
1400
x20662
1380B
Universal Solution
greedy
1400
x14584
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12638
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11912
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x21088
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x14005
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x23649
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15574
1373C
Pluses and Minuses
math
1300
x18336
1372C
Omkar and Baseball
constructive algorithms
,
math
1500
x17792
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x27856
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12974
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20507
1370C
Number Game
games
,
math
,
number theory
1400
x24499
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19554
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11766
1368C
Even Picture
constructive algorithms
1500
x13313
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19676
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x23440
1366C
Palindromic Paths
greedy
,
math
1500
x13558
1366B
Shuffle
math
,
two pointers
1300
x20920
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17186
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x23051
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x26792
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x13138
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x19771
1363C
Game On Leaves
games
,
trees
1600
x18639
1363B
Subsequence Hate
implementation
,
strings
1400
x23557
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x18232
1361A
Johnny and Contribution
constructive algorithms
,
graphs
,
greedy
,
sortings
1700
x8414
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12365
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x25233
1360D
Buying Shovels
math
,
number theory
1300
x32941
1359C
Mixing Water
binary search
,
math
1700
x13795
1358C
Celex Update
math
1600
x17344
1355D
Game With Array
constructive algorithms
,
math
1400
x17982
1354C1
Simple Polygon Embedding
binary search
,
geometry
,
math
,
ternary search
1400
x15670
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x18056
1352G
Special Permutation
constructive algorithms
1600
x21106
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x17065
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x20454
1352D
Alice, Bob and Candies
implementation
1300
x26068
1351C
Skier
data structures
,
implementation
1400
x8537
1350B
Orac and Models
dp
,
math
,
number theory
1400
x22054
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x16982
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14603
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x25285
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x378
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x502
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x605
1346B
Boot Camp
*special problem
,
greedy
1400
x1205
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15619
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12631
1342C
Yet Another Counting Problem
math
,
number theory
1600
x14007
1341B
Nastya and Door
greedy
,
implementation
1300
x19645
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