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Codeforces Round 950 (Div. 3)
2 days
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Difficulty:
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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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#
Name
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x206
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x377
1970E3
Trails (Hard)
dp
,
matrices
2200
x436
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1024
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1498
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1393
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
x1071
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2164
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1287
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2492
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2244
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1013
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2400
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1540
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1578
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
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1143
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2409
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1678
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1239
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1698
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2765
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x179
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1655
1906J
Count BFS Graph
combinatorics
,
dp
2100
x654
1906H
Twin Friends
combinatorics
,
dp
2200
x620
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x866
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1398
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1857
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1470
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1348
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2888
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
x2225
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1093
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2293
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x698
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x681
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1535
1866D
Digital Wallet
dp
,
greedy
2300
x1209
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2638
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1633
1860D
Balanced String
dp
2200
x2814
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2718
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3373
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
x1532
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1466
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1488
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1550
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1718
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1167
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2193
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2069
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
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2270
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1406
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1265
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1642
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1935
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x797
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1261
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1535
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1374
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2073
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2303
1798E
Multitest Generator
brute force
,
dp
2300
x1537
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1941
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1021
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1316
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2498
1784D
Wooden Spoon
combinatorics
,
dp
2400
x958
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1396
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2579
1776B
Vittorio Plays with LEGO Bricks
dp
,
geometry
2200
x1251
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2615
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1305
1767C
Count Binary Strings
data structures
,
dp
2100
x2534
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1141
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x589
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1187
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1708
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1970
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1369
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1747
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1434
1743E
FTL
binary search
,
dp
2400
x1492
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1435
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1178
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1471
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1815
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1246
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2073
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1829
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1759
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1620
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