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Codeforces Round 968 (Div. 2)
11:28:29
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Difficulty:
—
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
1427D
Unshuffling a Deck
constructive algorithms
,
implementation
2000
x3479
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10855
1426B
Symmetric Matrix
implementation
900
x20581
1426A
Floor Number
implementation
,
math
800
x47318
1425E
Excitation of Atoms
greedy
,
implementation
2200
x927
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x737
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14328
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x693
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4140
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x13015
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4626
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x488
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3244
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15291
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x16163
1419A
Digit Game
games
,
greedy
,
implementation
900
x19507
1418D
Trash Problem
data structures
,
implementation
2100
x4332
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x450
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x2029
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12323
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10831
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6467
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5678
1413B
A New Technique
implementation
1100
x11694
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2507
1411A
In-game Chat
implementation
800
x20556
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4286
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8801
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22512
1406A
Subset Mex
greedy
,
implementation
,
math
900
x21242
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x21373
1404A
Balanced Bitstring
implementation
,
strings
1500
x15242
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x48
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1178
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2403
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9244
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x18163
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2396
1396C
Monster Invaders
dp
,
greedy
,
implementation
2300
x2530
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x363
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x387
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3981
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16625
1392C
Omkar and Waterslide
greedy
,
implementation
1200
x18685
1392B
Omkar and Infinity Clock
implementation
,
math
800
x18461
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x5228
1391B
Fix You
brute force
,
greedy
,
implementation
800
x27010
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4274
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6392
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1540
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2501
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x19153
1384B2
Koa and the Beach (Hard Version)
constructive algorithms
,
dp
,
greedy
,
implementation
2200
x2485
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1604
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13213
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x2167
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4665
1380C
Create The Teams
brute force
,
dp
,
greedy
,
implementation
,
sortings
1400
x20550
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11884
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1286
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x920
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15499
1373A
Donut Shops
greedy
,
implementation
,
math
1000
x26786
1372A
Omkar and Completion
constructive algorithms
,
implementation
800
x31834
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x605
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12941
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20443
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9541
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x51206
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2218
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x24276
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x1031
1368A
C+=
brute force
,
greedy
,
implementation
,
math
800
x38696
1367D
Task On The Board
constructive algorithms
,
greedy
,
implementation
,
sortings
1800
x8300
1367A
Short Substrings
implementation
,
strings
800
x56776
1365F
Swaps Again
constructive algorithms
,
implementation
,
sortings
2100
x4423
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17044
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x22957
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x26688
1365A
Matrix Game
games
,
greedy
,
implementation
1100
x23999
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4328
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x4064
1363B
Subsequence Hate
implementation
,
strings
1400
x23471
1363A
Odd Selection
brute force
,
implementation
,
math
1200
x35498
1362A
Johnny and Ancient Computer
implementation
1000
x23669
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x152
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x312
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3607
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x25085
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x9369
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27661
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x445
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2297
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8123
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10582
1355A
Sequence with Digits
brute force
,
implementation
,
math
1200
x26365
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x30384
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x20284
1352D
Alice, Bob and Candies
implementation
1300
x25875
1352A
Sum of Round Numbers
implementation
,
math
800
x77335
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