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Codeforces Round 968 (Div. 2)
14:11:40
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Difficulty:
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bitmasks
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
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15713
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10157
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x14269
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3863
1594B
Special Numbers
bitmasks
,
math
1100
x19730
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7861
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5484
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x334
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x12091
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x22647
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x17423
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19475
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x6084
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x30658
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8542
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6816
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x8802
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12688
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17710
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6943
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16508
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7557
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5260
1527A
And Then There Were K
bitmasks
800
x35157
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11830
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x19056
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x24426
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x14477
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16860
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x14250
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20750
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x6065
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x7125
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6274
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x7250
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x19220
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4327
1421A
XORwice
bitmasks
,
greedy
,
math
800
x28557
1420B
Rock and Lever
bitmasks
,
math
1200
x25227
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4342
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5349
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x14018
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x5228
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x19153
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x5022
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11698
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x18058
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x18943
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12310
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7825
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8405
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x8156
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6662
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x12002
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x16379
1303D
Fill The Bag
bitmasks
,
greedy
1900
x7059
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x7096
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7665
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x14007
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8916
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3878
1217C
The Number Of Good Substrings
binary search
,
bitmasks
,
brute force
1700
x7404
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2938
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5871
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6611
1202A
You Are Given Two Binary Strings...
bitmasks
,
greedy
1100
x9234
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4672
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8878
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x11054
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3665
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4129
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1980
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x28167
1095C
Powers Of Two
bitmasks
,
greedy
1400
x16573
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2817
1051D
Bicolorings
bitmasks
,
dp
1700
x7338
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15820
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x3064
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3432
993B
Open Communication
bitmasks
,
brute force
1900
x1942
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3224
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5277
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3912
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3374
916B
Jamie and Binary Sequence (changed after round)
bitmasks
,
greedy
,
math
2000
x1894
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7851
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11903
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x3160
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5393
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x7099
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5413
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4384
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4593
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2857
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5151
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3177
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2989
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2298
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2272
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1716
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