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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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*has extra registration
→ Filter Problems
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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Custom test
Problems
#
Name
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x161
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x6887
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x291
1949F
Dating
greedy
,
sortings
,
trees
x671
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
x1048
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x558
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8584
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1681
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x52
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x31
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x205
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x359
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x111
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x212
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1590
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1465
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4064
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3661
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2851
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3061
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x389
1919H
Tree Diameter
interactive
,
trees
2000
x126
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x162
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3552
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x754
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x880
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x131
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2070
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1634
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3603
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2658
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x153
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x827
1905B
Begginer's Zelda
greedy
,
trees
1100
x15093
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x298
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x789
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x547
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x872
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3687
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1341
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x10278
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2857
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6544
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5497
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3331
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x67
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
x505
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x794
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4901
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5904
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1174
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1079
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x114
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x213
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6473
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x76
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x243
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1058
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x402
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2454
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
x9375
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x359
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x995
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1236
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4032
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17508
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1297
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x4852
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x517
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2887
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5233
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x619
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1455
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4930
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16916
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30869
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1228
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2078
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4872
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x577
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12296
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x355
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x691
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3629
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x123
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1233
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2463
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4296
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x764
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5499
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x239
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1382
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2821
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x527
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2665
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1512
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