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Codeforces Round 950 (Div. 3)
42:40:18
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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
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
x48
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
x234
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
x507
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1542
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4216
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
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x854
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x904
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1526
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x357
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x360
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1393
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x308
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x367
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x211
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7889
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x325
1949F
Dating
greedy
,
sortings
,
trees
2200
x798
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1314
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x629
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9423
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1851
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x68
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x33
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x210
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x404
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x128
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x258
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1662
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1541
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4250
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3879
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3052
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3278
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x420
1919H
Tree Diameter
interactive
,
trees
2000
x133
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x171
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3635
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x793
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x908
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x134
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2116
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1699
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3744
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2766
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x164
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x866
1905B
Begginer's Zelda
greedy
,
trees
1100
x15427
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x311
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x843
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x567
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x908
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3927
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1398
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x10586
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2945
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6829
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5635
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3427
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x69
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x100
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x530
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x827
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5041
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6129
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1192
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1105
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x118
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x256
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6691
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x78
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x250
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1093
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x415
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2481
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x71
1863H
Goldberg Machine 3
dp
,
trees
3500
x73
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9575
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x373
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1014
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1255
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4142
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17957
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1321
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x4961
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x527
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2969
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5385
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x666
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x654
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1488
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x5030
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17176
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31377
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1252
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2119
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4988
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x608
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12595
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