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Codeforces Round 945 (Div. 2)
13:11:27
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Difficulty:
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data structures
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
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10714
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11151
1279C
Stack of Presents
data structures
,
implementation
1400
x11428
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11799
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12046
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x12465
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12881
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12896
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x12942
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13166
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13405
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13757
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13966
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15067
650A
Watchmen
data structures
,
geometry
,
math
1400
x15068
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15257
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x15479
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x16014
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x16015
295A
Greg and Array
data structures
,
implementation
1400
x16108
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16275
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x16489
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16545
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16878
1490E
Accidental Victory
binary search
,
data structures
,
greedy
1400
x18421
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20200
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x20464
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x20761
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x22405
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x24570
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26817
195B
After Training
data structures
,
implementation
,
math
1300
x5124
1424G
Years
data structures
,
sortings
1300
x5650
222B
Cosmic Tables
data structures
,
implementation
1300
x5986
808B
Average Sleep Time
data structures
,
implementation
,
math
1300
x6671
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6759
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x7797
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8179
777B
Game of Credit Cards
data structures
,
dp
,
greedy
,
sortings
1300
x9347
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10585
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10759
1100B
Build a Contest
data structures
,
implementation
1300
x10899
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x11992
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12081
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12304
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14382
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14551
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14758
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15882
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16140
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16464
1698C
3SUM Closure
brute force
,
data structures
1300
x17955
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18282
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18382
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18599
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19855
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27077
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27532
4C
Registration System
data structures
,
hashing
,
implementation
1300
x77451
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10610
701B
Cells Not Under Attack
data structures
,
math
1200
x11583
879B
Table Tennis
data structures
,
implementation
1200
x11882
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x12150
18C
Stripe
data structures
,
implementation
1200
x12478
1214C
Bad Sequence
data structures
,
greedy
1200
x12862
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13433
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13941
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14471
1104B
Game with string
data structures
,
implementation
,
math
1200
x14499
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x15081
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16076
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x16951
1679B
Stone Age Problem
data structures
,
implementation
1200
x17034
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x17986
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18219
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18244
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19293
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20084
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20322
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21738
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21754
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26827
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42841
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4225
834B
The Festive Evening
data structures
,
implementation
1100
x8523
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8691
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x10939
427B
Prison Transfer
data structures
,
implementation
1100
x13720
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13782
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15638
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17705
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17888
1492B
Card Deck
data structures
,
greedy
,
math
1100
x18144
767A
Snacktower
data structures
,
implementation
1100
x19293
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19320
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19492
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19690
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19697
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20046
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20423
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