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Before contest
Codeforces Round 941 (Div. 1)
35:22:15
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Before contest
Codeforces Round 941 (Div. 2)
35:22:15
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implementation
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
12A
Super Agent
implementation
800
x12326
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12340
1088B
Ehab and subtraction
implementation
,
sortings
1000
x12342
1534B
Histogram Ugliness
greedy
,
implementation
,
math
1100
x12347
1461B
Find the Spruce
brute force
,
dp
,
implementation
1400
x12348
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12365
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12398
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x12401
1556B
Take Your Places!
implementation
1300
x12411
1059A
Cashier
implementation
1000
x12419
1324E
Sleeping Schedule
dp
,
implementation
1700
x12427
18C
Stripe
data structures
,
implementation
1200
x12435
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12473
1042A
Benches
binary search
,
implementation
1100
x12481
678A
Johny Likes Numbers
implementation
,
math
800
x12513
962A
Equator
implementation
1300
x12517
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12518
1076B
Divisor Subtraction
implementation
,
math
,
number theory
1200
x12518
697A
Pineapple Incident
implementation
,
math
900
x12566
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x12571
1534A
Colour the Flag
brute force
,
implementation
800
x12573
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x12643
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12669
1818A
Politics
greedy
,
implementation
800
x12689
620A
Professor GukiZ's Robot
implementation
,
math
800
x12715
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12734
1099A
Snowball
implementation
800
x12748
1031A
Golden Plate
implementation
,
math
800
x12752
1649B
Game of Ball Passing
greedy
,
implementation
1300
x12755
1194C
From S To T
implementation
,
strings
1300
x12763
1006B
Polycarp's Practice
greedy
,
implementation
,
sortings
1200
x12770
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12785
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x12797
796A
Buying A House
brute force
,
implementation
800
x12816
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12841
49A
Sleuth
implementation
800
x12854
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x12855
1185B
Email from Polycarp
implementation
,
strings
1200
x12859
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x12871
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12875
581B
Luxurious Houses
implementation
,
math
1100
x12878
992A
Nastya and an Array
implementation
,
sortings
800
x12884
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x12902
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x12908
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x12909
841A
Generous Kefa
brute force
,
implementation
900
x12914
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x12930
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x12937
1277A
Happy Birthday, Polycarp!
implementation
1000
x12940
1143A
The Doors
implementation
800
x12940
670D2
Magic Powder - 2
binary search
,
implementation
1500
x12953
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x12955
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x12964
47B
Coins
implementation
1200
x12964
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x12974
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x12980
493B
Vasya and Wrestling
implementation
1400
x12988
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13030
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13045
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x13047
363C
Fixing Typos
greedy
,
implementation
1400
x13047
987C
Three displays
brute force
,
dp
,
implementation
1400
x13063
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x13066
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13075
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13084
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13088
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x13113
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13135
1340A
Nastya and Strange Generator
brute force
,
data structures
,
greedy
,
implementation
1500
x13136
892A
Greed
greedy
,
implementation
900
x13191
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x13234
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
x13237
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13252
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13274
912A
Tricky Alchemy
implementation
800
x13300
1863C
MEX Repetition
implementation
,
math
1100
x13313
471A
MUH and Sticks
implementation
1100
x13313
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x13314
1738A
Glory Addicts
greedy
,
implementation
,
sortings
800
x13319
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13346
900A
Find Extra One
geometry
,
implementation
800
x13347
1279B
Verse For Santa
binary search
,
brute force
,
implementation
1300
x13348
1523A
Game of Life
implementation
800
x13388
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13397
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13401
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x13413
236B
Easy Number Challenge
implementation
,
number theory
1300
x13419
710A
King Moves
implementation
800
x13430
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13467
1272B
Snow Walking Robot
constructive algorithms
,
greedy
,
implementation
1200
x13476
362B
Petya and Staircases
implementation
,
sortings
1100
x13485
1197B
Pillars
greedy
,
implementation
1000
x13486
298B
Sail
brute force
,
greedy
,
implementation
1200
x13489
1165A
Remainder
implementation
,
math
1100
x13517
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x13520
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13533
16A
Flag
implementation
800
x13538
1786A1
Non-alternating Deck (easy version)
implementation
800
x13583
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13618
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x13663
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