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Codeforces Round 937 (Div. 4)
01:57:11
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math
combine-tags-by-or
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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
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
#
Name
1949K
Make Triangle
constructive algorithms
,
math
x111
1949H
Division Avoidance
greedy
,
math
x39
1949E
Damage per Second
brute force
,
math
x48
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x879
1946F
Nobody is needed
brute force
,
data structures
,
dp
,
math
2500
x514
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x1547
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x14808
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x362
1945B
Fireworks
math
,
number theory
900
x16564
1945A
Setting up Camp
greedy
,
math
800
x20822
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x18633
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x986
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x2696
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x24353
1941A
Rudolf and the Ticket
brute force
,
math
800
x36494
1937A
Shuffle Party
implementation
,
math
800
x20269
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x78
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2169
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6110
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1012
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x6712
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5641
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x15532
1934A
Too Min Too Max
greedy
,
math
800
x22119
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x798
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x8934
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x16711
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x19449
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x28579
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x33970
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x791
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6144
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x12677
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2308
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x12558
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x14989
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x24924
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x917
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x12810
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1536
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1400
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x3909
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x12640
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23095
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x27944
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x195
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1432
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3534
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7038
1928A
Rectangle Cutting
geometry
,
math
800
x20490
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1409
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x11842
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x24701
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9186
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3076
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x17664
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x718
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1001
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2174
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6795
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x4986
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16348
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18491
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3284
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8588
1921C
Sending Messages
greedy
,
math
900
x26556
1921A
Square
greedy
,
math
800
x38861
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2242
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x4914
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11329
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x18780
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x25966
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x740
1919A
Wallet Exchange
games
,
math
800
x31138
1918G
Permutation of Given
constructive algorithms
,
math
2700
x398
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12057
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28132
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1214
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1597
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9078
1917A
Least Product
constructive algorithms
,
math
800
x23723
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x484
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x566
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7706
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16312
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23040
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24164
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x17639
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1593
1914C
Quests
greedy
,
math
1100
x19861
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x27949
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x48
1912F
Fugitive Frenzy
math
,
probabilities
3100
x96
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x715
1912D
Divisibility Test
math
1900
x1226
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x851
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x66
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x791
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1575
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1199
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