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Before contest
Codeforces Round 974 (Div. 3)
05:01:15
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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
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6989
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5899
1552B
Running for Gold
combinatorics
,
graphs
,
greedy
,
sortings
1500
x15381
1552A
Subsequence Permutation
sortings
,
strings
800
x23796
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1832
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3900
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2746
1551D1
Domino (easy version)
constructive algorithms
,
math
1700
x7048
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x13264
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15469
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x29164
1551A
Polycarp and Coins
greedy
,
math
800
x50616
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x669
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1526
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1836
1550C
Manhattan Subarrays
brute force
,
geometry
,
greedy
,
implementation
1700
x10151
1550B
Maximum Cost Deletion
greedy
,
math
1000
x26345
1550A
Find The Array
greedy
,
math
800
x28065
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x24313
1549A
Gregor and Cryptography
math
,
number theory
800
x32339
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x450
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x242
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1455
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1822
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9767
1548A
Web of Lies
brute force
,
graphs
,
greedy
1400
x16387
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2986
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5799
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x14396
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16642
1547C
Pair Programming
greedy
,
two pointers
1100
x22593
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26364
1547A
Shortest Path with Obstacle
implementation
,
math
800
x30384
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x13072
1546A
AquaMoon and Two Arrays
brute force
,
greedy
800
x18192
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x108
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x86
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x80
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x493
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x604
1545B
AquaMoon and Chess
combinatorics
,
math
1900
x5910
1545A
AquaMoon and Strange Sort
sortings
1500
x13872
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x409
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x2010
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7585
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5280
1543B
Customising the Track
combinatorics
,
greedy
,
math
900
x23054
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x28081
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x847
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1233
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2610
1542C
Strange Function
math
,
number theory
1600
x14140
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x23000
1542A
Odd Set
math
800
x44500
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x28300
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x29360
1540E
Tasty Dishes
math
,
matrices
3500
x105
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x277
1540C2
Converging Array (Hard Version)
dp
,
math
2900
x454
1540C1
Converging Array (Easy Version)
dp
,
math
2700
x619
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2590
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x13910
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x862
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x943
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11613
1539C
Stable Groups
greedy
,
sortings
1200
x22749
1539B
Love Song
dp
,
implementation
,
strings
800
x24384
1539A
Contest Start
combinatorics
,
geometry
,
greedy
,
math
1000
x20026
1538G
Gift Set
binary search
,
greedy
,
math
,
ternary search
2100
x4527
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x19175
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2885
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x13567
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x28334
1538B
Friends and Candies
greedy
,
math
800
x31614
1538A
Stone Game
brute force
,
dp
,
greedy
800
x36704
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2463
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5191
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12885
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x12340
1537C
Challenging Cliffs
constructive algorithms
,
greedy
,
implementation
,
math
1200
x27480
1537B
Bad Boy
constructive algorithms
,
greedy
,
math
900
x29756
1537A
Arithmetic Array
greedy
,
math
800
x37085
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x948
1536E
Omkar and Forest
combinatorics
,
graphs
,
math
,
shortest paths
2300
x2397
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4668
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x14073
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x18682
1536A
Omkar and Bad Story
brute force
,
constructive algorithms
800
x20181
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x451
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2743
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7704
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16444
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x30442
1535A
Fair Playoff
brute force
,
implementation
800
x49133
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x149
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x561
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x535
1534F1
Falling Sand (Easy Version)
dfs and similar
,
graphs
,
greedy
2500
x1221
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1912
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x6014
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