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Pinely Round 4 (Div. 1 + Div. 2)
14:16:38
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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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Problems
#
Name
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x4628
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x7705
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5034
1989C
Two Movies
greedy
,
math
1400
x15750
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x13815
1987D
World is Mine
dp
,
games
1800
x6060
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x3775
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x7587
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x13541
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x4739
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x7960
1985F
Final Boss
binary search
,
data structures
1500
x13131
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x6547
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x14704
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x7111
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x10952
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6222
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4625
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x12400
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3346
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x9329
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x12957
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x17092
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5897
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x9815
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x13291
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6044
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9286
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5354
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3234
1974E
Money Buys Happiness
dp
1800
x7122
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x13551
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x14525
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7600
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12910
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8307
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8940
1971E
Find the Car
binary search
,
math
,
sortings
1500
x12755
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1120
1970E1
Trails (Easy)
dp
1800
x1689
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1249
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2149
1970C1
Game on Tree (Easy)
games
1400
x2797
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x929
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4090
1969C
Minimizing the Sum
dp
,
implementation
1700
x7738
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3860
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4935
1968E
Cells Arrangement
constructive algorithms
1600
x9554
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x13855
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12154
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x11391
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6087
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x12447
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x228
1958D
Staircase
*special problem
1600
x439
1958C
Firewood
*special problem
1500
x611
1958B
Clock in the Pool
*special problem
,
math
1400
x772
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4155
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x8871
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12071
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4120
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6585
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8038
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x14388
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x19913
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5603
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x10884
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4008
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8495
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x13417
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1521
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1493
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x2647
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8835
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x15804
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4398
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x10032
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3928
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7622
1945D
Seraphim the Owl
dp
,
greedy
1300
x13534
1943A
MEX Game 1
games
,
greedy
1300
x16776
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5877
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x10388
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5603
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8993
1938H
Pho Restaurant
1600
x1963
1938C
Bit Counting Sequence
1900
x1328
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x14174
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7011
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7812
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7736
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6404
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x10586
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3796
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7621
1932D
Card Game
greedy
,
implementation
1400
x10823
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14902
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x7524
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x14634
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