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Before contest
Codeforces Round 937 (Div. 4)
04:39:44
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Difficulty:
—
trees
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
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x190
1949F
Dating
greedy
,
sortings
,
trees
x484
1949C
Annual Ants' Gathering
dfs and similar
,
greedy
,
trees
x790
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x468
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x7052
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1454
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x24
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x192
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x311
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x98
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x193
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1534
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1397
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x3908
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3527
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2665
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x2870
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x380
1919H
Tree Diameter
interactive
,
trees
2000
x118
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x143
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3502
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x710
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x866
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x126
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2035
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1593
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3511
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2564
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x151
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x801
1905B
Begginer's Zelda
greedy
,
trees
1100
x14875
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x284
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x770
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x518
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x852
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3599
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1313
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x9970
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2791
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6406
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5388
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3269
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x66
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x492
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x782
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4751
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5684
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1162
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1059
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x109
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x210
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6344
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x76
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x241
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1050
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x399
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2436
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x66
1863H
Goldberg Machine 3
dp
,
trees
3500
x69
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9248
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x355
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x985
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1227
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x3965
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17260
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1288
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x4795
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x499
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2826
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5140
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x612
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x627
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1428
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4860
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16667
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30442
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1212
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2055
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4790
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x564
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12128
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x348
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x680
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3603
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x120
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1217
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2450
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4258
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x749
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5403
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x235
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1363
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2800
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x519
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2635
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1488
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x5904
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x423
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1885
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