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Before contest
Codeforces Round 1134 (Div. 4)
39:45:17
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
2138D
Antiamuny and Slider Movement
brute force
,
combinatorics
,
implementation
,
math
,
sortings
2600
x695
2138C2
Maple and Tree Beauty (Hard Version)
bitmasks
,
brute force
,
dfs and similar
,
dp
,
fft
,
trees
2000
x3691
2138C1
Maple and Tree Beauty (Easy Version)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1800
x5859
2138B
Antiamuny Wants to Learn Swap
data structures
,
greedy
,
two pointers
1900
x5755
2138A
Cake Assignment
bitmasks
,
constructive algorithms
,
greedy
1100
x18038
2137G
Cry Me a River
dfs and similar
,
dp
,
games
,
graphs
2200
x2102
2137F
Prefix Maximum Invariance
binary search
,
combinatorics
,
data structures
,
sortings
1900
x4317
2137E
Mexification
brute force
,
implementation
,
math
1500
x10968
2137D
Replace with Occurrences
constructive algorithms
1200
x20956
2137C
Maximum Even Sum
brute force
,
greedy
,
implementation
,
math
1100
x24342
2137B
Fun Permutation
constructive algorithms
,
math
,
number theory
900
x28060
2137A
Collatz Conjecture
constructive algorithms
,
math
800
x36981
2136B
Like the Bitset
constructive algorithms
,
greedy
,
two pointers
900
x22095
2136A
In the Dream
greedy
,
math
800
x27328
2135F
To the Infinity
data structures
,
hashing
,
math
,
trees
3500
x703
2135E2
Beyond the Palindrome (Hard Version)
combinatorics
,
dp
,
math
,
number theory
3500
x325
2135E1
Beyond the Palindrome (Easy Version)
combinatorics
,
dp
,
math
3300
x1404
2135D2
From the Unknown (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2500
x1514
2135D1
From the Unknown (Easy Version)
constructive algorithms
,
interactive
,
math
2100
x4353
2135C
By the Assignment
binary search
,
bitmasks
,
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
math
2000
x6613
2135B
For the Champion
constructive algorithms
,
interactive
,
math
1700
x9516
2135A
Against the Difference
data structures
,
dp
1200
x21684
2134F
Permutation Oddness
combinatorics
,
dp
,
math
2900
x727
2134E
Power Boxes
constructive algorithms
,
dp
,
implementation
,
interactive
2300
x2579
2134D
Sliding Tree
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
,
trees
2300
x3865
2134C
Even Larger
brute force
,
greedy
,
implementation
1200
x19942
2134B
Add 0 or K
constructive algorithms
,
math
,
number theory
1200
x22489
2134A
Painting With Two Colors
constructive algorithms
,
implementation
,
math
800
x27799
2133F
Flint and Steel
data structures
,
dp
,
graphs
3000
x553
2133E
I Yearned For The Mines
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1834
2133D
Chicken Jockey
dp
,
greedy
1900
x8004
2133C
The Nether
graphs
,
interactive
1400
x13577
2133B
Villagers
greedy
800
x26447
2133A
Redstone?
brute force
,
data structures
,
implementation
,
math
800
x32276
2132G
Famous Choreographer
hashing
,
implementation
,
strings
2600
x545
2132F
Rada and the Chamomile Valley
dfs and similar
,
graphs
,
shortest paths
2100
x3072
2132E
Arithmetics Competition
binary search
,
data structures
,
greedy
,
sortings
,
ternary search
1700
x8741
2132D
From 1 to Infinity
binary search
,
dp
,
implementation
,
math
1600
x9420
2132C2
The Cunning Seller (hard version)
binary search
,
greedy
,
math
1400
x14302
2132C1
The Cunning Seller (easy version)
greedy
,
math
1000
x29124
2132B
The Secret Number
math
900
x35202
2132A
Homework
brute force
,
implementation
,
strings
800
x46178
2131H
Sea, You & copriMe
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
2600
x959
2131G
Wafu!
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dp
,
math
2000
x3968
2131F
Unjust Binary Life
binary search
,
data structures
,
greedy
,
greedy
,
math
,
sortings
,
two pointers
1900
x4910
2131E
Adjacent XOR
brute force
,
greedy
1400
x18287
2131D
Arboris Contractio
data structures
,
graphs
,
greedy
,
trees
1400
x15254
2131C
Make it Equal
math
,
number theory
1100
x22779
2131B
Alternating Series
constructive algorithms
,
greedy
,
math
800
x31870
2131A
Lever
math
800
x40287
2130B
Pathless
constructive algorithms
1100
x22348
2130A
Submission is All You Need
greedy
,
math
800
x29321
2129F2
Top-K Tracker (Hard Version)
interactive
,
interactive
3500
x148
2129F1
Top-K Tracker (Easy Version)
interactive
3500
x1031
2129E
Induced Subgraph Queries
data structures
,
graphs
,
sortings
3000
x727
2129D
Permutation Blackhole
brute force
,
combinatorics
,
dp
,
implementation
,
math
2600
x3796
2129C3
Interactive RBS (Hard Version)
binary search
,
bitmasks
,
constructive algorithms
,
dp
,
interactive
2300
x2344
2129C2
Interactive RBS (Medium Version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
2000
x3937
2129C1
Interactive RBS (Easy Version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1900
x5341
2129B
Stay or Mirror
brute force
,
data structures
,
dp
,
greedy
,
sortings
1600
x16343
2129A
Double Perspective
constructive algorithms
,
dp
,
dsu
,
graphs
,
greedy
,
sortings
1300
x19455
2128F
Strict Triangle
graphs
,
greedy
,
shortest paths
3200
x473
2128E2
Submedians (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
math
,
two pointers
2600
x853
2128E1
Submedians (Easy Version)
binary search
,
data structures
,
dp
,
greedy
,
math
1900
x6998
2128D
Sum of LDS
brute force
,
combinatorics
,
dp
,
greedy
,
math
1600
x13241
2128C
Leftmost Below
greedy
,
math
1200
x21884
2128B
Deque Process
constructive algorithms
,
greedy
,
sortings
,
two pointers
1100
x22483
2128A
Recycling Center
greedy
,
sortings
800
x29417
2127H
23 Rises Again
brute force
,
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
,
probabilities
,
trees
3100
x2821
2127G2
Inter Active (Hard Version)
binary search
,
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
math
,
probabilities
3500
x173
2127G1
Inter Active (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
probabilities
3400
x195
2127F
Hamed and AghaBalaSar
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2800
x3019
2127E
Ancient Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2100
x5497
2127D
Root was Built by Love, Broken by Destiny
combinatorics
,
dfs and similar
,
graphs
,
trees
1800
x8535
2127C
Trip Shopping
games
,
greedy
,
sortings
1400
x15278
2127B
Hamiiid, Haaamid... Hamid?
games
,
greedy
1300
x15314
2127A
Mix Mex Max
constructive algorithms
,
greedy
,
math
800
x22290
2126G2
Big Wins! (hard version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
trees
,
two pointers
2400
x1281
2126G1
Big Wins! (easy version)
binary search
,
data structures
,
dp
,
dsu
,
two pointers
2200
x2645
2126F
1-1-1, Free Tree!
brute force
,
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2000
x4550
2126E
G-C-D, Unlucky!
math
,
number theory
1400
x17981
2126D
This Is the Last Time
data structures
,
greedy
,
sortings
1200
x25165
2126C
I Will Definitely Make It
greedy
,
sortings
1100
x27395
2126B
No Casino in the Mountains
dp
,
greedy
800
x39075
2126A
Only One Digit
brute force
,
implementation
,
math
800
x55181
2125F
Timofey and Docker
binary search
,
divide and conquer
,
dp
3000
x483
2125E
Sets of Complementary Sums
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2500
x1484
2125D
Segments Covering
dp
,
math
,
probabilities
1600
x9976
2125C
Count Good Numbers
bitmasks
,
combinatorics
,
math
,
number theory
1100
x23800
2125B
Left and Down
math
,
number theory
900
x29212
2125A
Difficult Contest
constructive algorithms
,
implementation
,
sortings
,
strings
800
x28892
2124I
Lexicographic Partition
constructive algorithms
,
math
,
trees
3500
x778
2124H
Longest Good Subsequence
dp
,
math
,
trees
3400
x267
2124G
Maximise Sum
binary search
,
data structures
3200
x770
2124F2
Appending Permutations (Hard Version)
combinatorics
,
dp
2800
x1266
2124F1
Appending Permutations (Easy Version)
combinatorics
,
dp
2300
x3577
2124E
Make it Zero
constructive algorithms
,
greedy
,
math
2100
x5917
2124D
Make a Palindrome
greedy
,
sortings
,
two pointers
1700
x10203
2124C
Subset Multiplication
constructive algorithms
,
greedy
,
math
,
number theory
1300
x17676
2124B
Minimise Sum
greedy
1000
x23301
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