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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
34:02:50
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→ Filter Problems
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
1431J
Zero-XOR Array
*special problem
,
dp
3400
x44
1958J
Necromancer
*special problem
3200
x27
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x48
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x58
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x29
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x35
1488I
Demonic Invasion
*special problem
,
flows
3100
x37
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x45
1211I
Unusual Graph
*special problem
,
graphs
3000
x38
1571J
Two Railroads
*special problem
3000
x40
683J
The Hero with Bombs
*special problem
3000
x40
775A
University Schedule
*special problem
2900
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
1431I
Cyclic Shifts
*special problem
,
strings
2900
x45
1910J
Two Colors
*special problem
2900
x48
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x48
1346I
Pac-Man 2.0
*special problem
,
dp
2900
x48
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x110
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x121
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x127
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x58
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x130
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x462
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x47
345F
Superstitions Inspection
*special problem
2700
x47
345E
Black Cat Rush
*special problem
2700
x47
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x49
1910G
Pool Records
*special problem
,
greedy
2700
x58
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x106
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x176
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x257
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x67
1958H
Composite Spells
*special problem
,
dp
2600
x71
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x201
1505G
Encoded message
*special problem
,
implementation
2600
x298
683I
Loader
*special problem
,
graphs
2500
x38
530I
Different variables
*special problem
2500
x46
1211G
King's Path
*special problem
,
math
,
trees
2500
x70
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x75
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x122
290E
HQ
*special problem
,
constructive algorithms
2500
x198
1505H
L BREAK into program
*special problem
2500
x497
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x868
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x62
661H
Rotate Matrix
*special problem
2400
x69
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x85
64I
Sort the Table
*special problem
,
sortings
2400
x87
1958G
Observation Towers
*special problem
2400
x100
409I
Feed the Golorp
*special problem
2400
x118
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x290
72D
Perse-script
*special problem
,
expression parsing
2300
x74
470G
Hamming Distance
*special problem
2300
x95
774I
Composing Of String
*special problem
,
dp
2300
x101
470F
Pairwise Sums
*special problem
2300
x104
64H
Table Bowling
*special problem
,
sortings
2300
x112
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x119
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x121
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x134
130I
Array sorting
*special problem
,
sortings
2300
x167
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x174
470H
Array Sorting
*special problem
2300
x188
774E
Big Number and Remainder
*special problem
,
math
,
number theory
2300
x210
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x362
345G
Suffix Subgroup
*special problem
,
strings
2200
x55
661G
Hungarian Notation
*special problem
2200
x56
72B
INI-file
*special problem
,
implementation
2200
x77
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x79
64G
Path Canonization
*special problem
2200
x118
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x190
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x212
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x255
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x269
153C
Caesar Cipher
*special problem
2200
x374
409G
On a plane
*special problem
,
geometry
2200
x508
1505I
Mysterious language again, seriously?
*special problem
2200
x549
1505F
Math
*special problem
,
math
2200
x1485
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x76
153E
Euclidean Distance
*special problem
2100
x78
530F
Jumping frogs
*special problem
2100
x100
530H
Points in triangle
*special problem
,
geometry
2100
x122
345B
Triskaidekaphobia
*special problem
2100
x125
661D
Maximal Difference
*special problem
2100
x131
530G
Levenshtein distance
*special problem
2100
x152
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x156
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x181
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x184
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x217
774A
Amusement Park
*special problem
,
ternary search
2100
x297
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x693
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x912
656D
Rosetta Problem
*special problem
2100
x949
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1381
162G
Non-decimal sum
*special problem
2000
x62
162I
Truncatable primes
*special problem
2000
x77
153D
Date Change
*special problem
2000
x82
661E
Divisibility Check
*special problem
2000
x84
345C
Counting Fridays
*special problem
2000
x126
661C
Array Sum
*special problem
2000
x132
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x172
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x174
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