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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
08:04:39
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Difficulty:
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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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Custom test
Problems
#
Name
1211I
Unusual Graph
*special problem
,
graphs
3000
x38
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x45
1211G
King's Path
*special problem
,
math
,
trees
2500
x70
1210G
Mateusz and Escape Room
dp
3500
x159
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x194
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x191
1210E
Wojtek and Card Tricks
math
2700
x395
1210D
Konrad and Company Evaluation
graphs
2400
x1489
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x139
1209G2
Into Blocks (hard version)
data structures
3200
x420
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1117
1209E2
Rotate Columns (hard version)
bitmasks
,
dp
,
greedy
,
sortings
2500
x1901
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x147
1208G
Polygons
greedy
,
math
,
number theory
2800
x740
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2362
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x991
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x122
1205E
Expected Value Again
combinatorics
,
strings
3100
x274
1205D
Almost All
constructive algorithms
,
trees
2700
x635
1205C
Palindromic Paths
implementation
,
interactive
2400
x1148
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x387
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x2026
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x143
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x127
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x847
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x1168
1197F
Coloring Game
dp
,
games
,
matrices
2700
x245
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x877
1194G
Another Meme Problem
dp
2700
x239
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x981
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x92
1190E
Tokitsukaze and Explosion
binary search
,
greedy
3100
x225
1188E
Problem from Red Panda
combinatorics
3300
x227
1188D
Make Equal
dp
3100
x677
1188C
Array Beauty
dp
2500
x1736
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1219
1187G
Gang Up
flows
,
graphs
2500
x507
1187F
Expected Square Beauty
dp
,
math
,
probabilities
2500
x857
1187D
Subarray Sorting
data structures
,
sortings
2400
x2520
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x762
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x619
1185G2
Playlist for Polycarp (hard version)
combinatorics
,
dp
2600
x748
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x500
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x104
1184C3
Heidi and the Turing Test (Hard)
3200
x41
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x171
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x139
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x334
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x820
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x277
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x466
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x173
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x799
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x225
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x433
1178F2
Long Colorful Strip
dp
2600
x873
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x450
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1682
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1659
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1384
1172F
Nauuo and Bug
data structures
3300
x422
1172E
Nauuo and ODT
data structures
3300
x304
1172D
Nauuo and Portals
constructive algorithms
2900
x488
1172C2
Nauuo and Pictures (hard version)
dp
,
probabilities
2600
x829
1168E
Xor Permutations
constructive algorithms
,
math
3100
x363
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x342
1167G
Low Budget Inception
brute force
,
geometry
3100
x149
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x691
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x841
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x652
1158F
Density of subarrays
dp
,
math
3500
x399
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x150
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x722
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x127
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x408
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x771
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x624
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x546
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x950
1149E
Election Promises
games
,
graphs
3200
x497
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x719
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1199
1148H
Holy Diver
data structures
3500
x252
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x319
1148F
Foo Fighters
bitmasks
,
constructive algorithms
2700
x991
1147F
Zigzag Game
games
,
interactive
3500
x246
1147E
Rainbow Coins
interactive
3000
x333
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x736
1146H
Satanic Panic
dp
,
geometry
2900
x596
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x809
1146F
Leaf Partition
dp
,
trees
2500
x1103
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x874
1144G
Two Merged Sequences
dp
,
greedy
2400
x1908
1142E
Pink Floyd
graphs
,
interactive
3200
x497
1142D
Foreigner
dp
2800
x483
1142C
U2
geometry
2400
x1338
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x478
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1180
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x401
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1756
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