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Codeforces Round 950 (Div. 3)
34:43:04
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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
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1533
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x208
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x358
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x361
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1026
1958G
Observation Towers
*special problem
2400
x91
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1052
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1287
1938K
Tree Quiz
2400
x540
1938F
Forming Groups
2400
x664
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1129
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1195
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1220
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1013
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1059
1913E
Matrix Problem
flows
,
graphs
2400
x930
1912H
Hypercatapult Commute
graphs
2400
x379
1912G
Great City Saint Petersburg
data structures
2400
x425
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x81
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1266
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x866
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x908
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1598
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1348
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x967
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1192
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1075
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1093
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x698
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x660
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1320
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1471
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1466
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1695
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1167
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2089
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1809
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1543
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1784
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1517
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1406
1817C
Similar Polynomials
combinatorics
,
math
2400
x932
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x797
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1375
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1070
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1022
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1316
1784D
Wooden Spoon
combinatorics
,
dp
2400
x959
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x678
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1318
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1707
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x826
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1025
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1305
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x564
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x669
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1187
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1744
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1683
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1369
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1632
1743E
FTL
binary search
,
dp
2400
x1492
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1180
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1159
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1246
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1025
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1371
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1362
1725L
Lemper Cooking Competition
data structures
2400
x882
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1759
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1532
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1621
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1525
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x475
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2481
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1401
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1660
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1145
1680D
Dog Walking
brute force
,
greedy
,
math
2400
x1124
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1105
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x776
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x923
1667C
Half Queen Cover
constructive algorithms
,
math
2400
x1523
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1797
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1605
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1462
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1112
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1516
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1990
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1522
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x863
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1079
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1716
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1408
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1885
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1355
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1403
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1001
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1331
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1269
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