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Before contest
Codeforces Round #715 (Div. 1)
23:57:09
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*has extra registration
Before contest
Codeforces Round #715 (Div. 2)
23:57:07
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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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Problems
#
Name
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
games
,
two pointers
2700
x201
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x489
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x1801
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x798
1497E1
Square-free division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x4719
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x154
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x398
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x500
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x2869
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x3691
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x9087
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x2932
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x175
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x6012
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x123
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x12945
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x4988
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1355
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x7219
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x2994
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x5418
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x8016
1462A
Favorite Sequence
implementation
,
two pointers
800
x22927
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x3879
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x2503
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1111
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x391
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x49
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x636
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x814
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x900
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x612
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x4032
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x1240
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x1460
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x6397
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x2509
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x3146
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x6540
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x8041
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x9777
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x780
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x194
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x7984
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x1759
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x5406
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x163
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x207
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x543
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x6770
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x734
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x4976
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x140
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x1646
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x18503
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x12199
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x7938
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x798
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x3668
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x235
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1095
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x9623
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x3551
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x617
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x642
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x14435
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x13680
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x932
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2136
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x17042
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x13814
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3003
1366B
Shuffle
math
,
two pointers
1300
x14428
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x6219
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x19468
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x6321
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x17311
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x7757
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x11697
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x4913
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x9204
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x23054
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x8643
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x5918
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x7914
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3162
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x9181
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x902
1326E
Bombs
data structures
,
two pointers
2400
x1442
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x14589
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x478
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x8947
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x294
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x4692
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x10886
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x3592
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1191
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x3329
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x2811
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1150
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