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Codeforces Round 968 (Div. 2)
40:16:07
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Difficulty:
—
dp
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
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x162
2002F2
Court Blue (Hard Version)
brute force
,
dp
,
math
,
number theory
2800
x324
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x653
2002E
Cosmic Rays
brute force
,
data structures
,
dp
2300
x1892
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
data structures
,
dp
,
trees
2900
x104
2001E1
Deterministic Heap (Easy Version)
combinatorics
,
dp
,
math
,
trees
2400
x841
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x4157
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2598
1997F
Chips on a Line
brute force
,
combinatorics
,
dp
,
greedy
,
math
2700
x748
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x251
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x316
1995D
Cases
bitmasks
,
brute force
,
dp
,
strings
2300
x2032
1994G
Minecraft
bitmasks
,
brute force
,
dp
,
graphs
,
math
2600
x1083
1993E
Xor-Grid Problem
bitmasks
,
constructive algorithms
,
dp
,
implementation
2700
x412
1993D
Med-imize
binary search
,
dp
,
greedy
2200
x3178
1992G
Ultra-Meow
combinatorics
,
dp
,
math
2000
x2678
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5187
1991H
Prime Split Game
bitmasks
,
dp
,
fft
,
games
,
math
,
number theory
3300
x156
1990F
Polygonal Segments
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
two pointers
2800
x225
1990D
Grid Puzzle
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
1800
x5554
1989E
Distance to Different
combinatorics
,
dp
,
math
2300
x1754
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5460
1988F
Heartbeat
combinatorics
,
dp
,
fft
,
math
3000
x163
1988D
The Omnipotent Monster Killer
brute force
,
dfs and similar
,
dp
,
trees
2000
x4408
1987G2
Spinning Round (Hard Version)
divide and conquer
,
dp
,
trees
3500
x135
1987G1
Spinning Round (Easy Version)
divide and conquer
,
dp
,
trees
2900
x241
1987F2
Interesting Problem (Hard Version)
dp
2600
x917
1987F1
Interesting Problem (Easy Version)
dp
2500
x1031
1987D
World is Mine
dp
,
games
1800
x6537
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1393
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x159
1984F
Reconstruction
brute force
,
dp
,
math
2500
x868
1984E
Shuffle
dp
,
greedy
,
trees
2400
x1301
1983G
Your Loss
bitmasks
,
brute force
,
dp
,
trees
3000
x184
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1448
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x235
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6165
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3467
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6287
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x500
1975I
Mind Bloom
dp
3500
x77
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x749
1974E
Money Buys Happiness
dp
1800
x7408
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x190
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x297
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x512
1970E3
Trails (Hard)
dp
,
matrices
2200
x637
1970E2
Trails (Medium)
dp
,
matrices
2000
x1101
1970E1
Trails (Easy)
dp
1800
x1856
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1345
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x235
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1253
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1792
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3961
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x95
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x197
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1594
1958H
Composite Spells
*special problem
,
dp
2600
x71
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1189
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4268
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3710
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1190
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4240
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6732
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x240
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5778
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x254
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4129
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1581
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x99
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x892
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2424
1943F
Minimum Hamming Distance
dp
3500
x102
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x690
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1383
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x87
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x423
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2681
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7867
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2408
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3901
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x328
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1087
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2549
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3988
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1624
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4550
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1649
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1604
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3391
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1639
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3488
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x145
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x943
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3614
1922F
Replace on Segment
dp
,
graph matchings
2500
x1343
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1210
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3720
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2552
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x803
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