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Problems
#
Name
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x968
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3207
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x414
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x766
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1568
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8050
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5241
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x865
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4755
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15617
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4381
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x531
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9765
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7735
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x293
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21332
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1856
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10508
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4250
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9233
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13237
1462A
Favorite Sequence
implementation
,
two pointers
800
x40122
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3812
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1487
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5316
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1220
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1225
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1292
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1170
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2117
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
x8673
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2167
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4684
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14812
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1467
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x357
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11783
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5545
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7580
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4169
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8647
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11436
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2503
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x286
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x903
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9833
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2222
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x27834
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1068
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x297
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6467
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x350
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18413
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10244
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x447
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1390
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12774
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4627
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1059
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5430
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x902
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22291
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x967
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19085
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1448
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2989
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3962
1366B
Shuffle
math
,
two pointers
1300
x19670
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18508
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26850
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8975
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27110
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8034
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10220
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29364
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19417
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12221
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36476
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5839
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11030
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x7994
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10480
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3979
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12190
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1608
1326E
Bombs
data structures
,
two pointers
2400
x2004
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26858
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x515
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x718
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11393
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6077
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x15803
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4935
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1665
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4109
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1759
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3412
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12306
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
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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
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math
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