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Codeforces Round 950 (Div. 3)
38:15:45
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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
1975I
Mind Bloom
dp
3500
x19
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x516
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x136
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x207
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x379
1970E3
Trails (Hard)
dp
,
matrices
2200
x437
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x148
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1025
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1499
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x68
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x142
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1394
1958H
Composite Spells
*special problem
,
dp
2600
x64
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1052
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1073
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x215
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x211
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x89
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x795
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2164
1943F
Minimum Hamming Distance
dp
3500
x84
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x625
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1287
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x68
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x381
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x258
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1013
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1541
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1579
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1517
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1529
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x134
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x790
1922F
Replace on Segment
dp
,
graph matchings
2500
x1182
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1143
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x750
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x786
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x908
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1679
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x503
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x585
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x134
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1240
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x43
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x840
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1656
1906H
Twin Friends
combinatorics
,
dp
2200
x621
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x866
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x716
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1398
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x94
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x83
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x178
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x641
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1470
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x181
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x69
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x898
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1348
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x256
1874G
Jellyfish and Inscryption
dp
3500
x75
1874F
Jellyfish and OEIS
dp
3500
x160
1874E
Jellyfish and Hack
dp
,
math
3000
x275
1874D
Jellyfish and Miku
divide and conquer
,
dp
,
math
,
probabilities
2800
x658
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
2300
x1522
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1075
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2226
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x74
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1093
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x698
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x415
1866J
Jackets and Packets
dp
2800
x271
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x681
1866E
Elevators of Tamem
dp
2700
x279
1866D
Digital Wallet
dp
,
greedy
2300
x1209
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x273
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x71
1863H
Goldberg Machine 3
dp
,
trees
3500
x73
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x578
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1044
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1633
1860D
Balanced String
dp
2200
x2815
1859E
Maximum Monogonosity
brute force
,
dp
,
math
2500
x1679
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2719
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1321
1854F
Mark and Spaceship
brute force
,
dp
3500
x115
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x386
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1412
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3374
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x100
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x432
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1471
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1533
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1466
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x356
1845E
Boxes and Balls
dp
,
implementation
,
math
2500
x1278
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x133
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1488
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x109
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x568
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