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Problems
#
Name
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x704
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6037
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x970
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3212
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x418
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x769
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1571
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8067
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5249
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x869
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4770
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15649
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4392
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x535
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9788
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7752
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x294
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21422
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1860
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10523
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4258
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9259
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13261
1462A
Favorite Sequence
implementation
,
two pointers
800
x40203
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3827
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1489
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5326
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1227
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1227
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1294
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1173
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2127
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x65
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1001
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8680
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2172
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4695
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14872
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1470
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x358
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11843
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5554
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7597
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4175
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8662
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11506
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2510
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x287
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x907
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9842
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2224
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x27898
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1071
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x299
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6474
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x352
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18447
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10252
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x451
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1391
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12786
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4636
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1061
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5436
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x906
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22401
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x969
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19109
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1453
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x3002
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3976
1366B
Shuffle
math
,
two pointers
1300
x19740
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18576
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26940
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8990
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27149
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8043
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10243
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29504
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19547
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12291
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36819
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5893
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11083
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8033
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10519
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3984
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12208
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1610
1326E
Bombs
data structures
,
two pointers
2400
x2006
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26957
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x519
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x719
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11398
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6084
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x15832
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4958
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1668
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4114
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1768
←
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Codeforces Round 950 (Div. 3)
34:47:10
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→ Filter Problems
Difficulty:
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two pointers
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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