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Codeforces Round (Div. 2)
5 days
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Difficulty:
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data structures
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
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x3625
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x639
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x956
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x18478
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x21456
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1111
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x4149
1985F
Final Boss
binary search
,
data structures
1500
x11680
1982F
Sorting Problem Again
binary search
,
data structures
,
sortings
2600
x622
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x5222
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x13214
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x190
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x617
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x934
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3104
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x8657
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1112
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x937
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x2821
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x8683
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x11915
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5714
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x418
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x802
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3424
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1894
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3619
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3067
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x13859
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12407
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x7985
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1141
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3931
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1669
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3683
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4735
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x49
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1469
1965F
Conference
data structures
,
flows
3300
x125
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x337
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x396
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x304
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x20308
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13960
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x25640
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1983
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x696
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x13353
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x825
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x555
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x676
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3822
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x74
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x616
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2580
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8717
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x126
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x33
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x449
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1163
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2578
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x412
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1227
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7513
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3639
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14573
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x316
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6640
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1685
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x222
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3926
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1543
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4010
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x19337
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10853
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2354
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3393
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6214
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5377
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1171
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3587
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20595
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x428
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x907
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x763
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2077
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3675
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x17508
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4439
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22752
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1698
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x20379
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2133
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x12340
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x19541
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1258
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x296
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2837
1912G
Great City Saint Petersburg
data structures
2400
x433
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1936
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