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Before contest
Codeforces Round 973 (Div. 2)
13:37:25
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Difficulty:
—
dfs and similar
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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Standings
Custom test
Problems
#
Name
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x184
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x2741
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x5736
2003D2
Turtle and a MEX Problem (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
math
2100
x3639
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x763
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2190
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4071
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10002
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x11638
1994F
Stardew Valley
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x1093
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x3958
1990E2
Catch the Mole(Hard Version)
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
interactive
,
trees
2600
x813
1990E1
Catch the Mole(Easy Version)
binary search
,
data structures
,
dfs and similar
,
interactive
,
trees
2500
x875
1989F
Simultaneous Coloring
dfs and similar
,
divide and conquer
,
graphs
3000
x431
1988D
The Omnipotent Monster Killer
brute force
,
dfs and similar
,
dp
,
trees
2000
x4650
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x3199
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x4319
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1457
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5358
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1554
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x1182
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1264
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x523
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x988
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x784
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x2190
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5757
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1719
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9583
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x316
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x546
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1269
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1432
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2491
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14494
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x630
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x419
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4358
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x1011
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4221
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1721
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1639
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x101
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16408
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x911
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2040
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2728
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3417
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x18114
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x35
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x83
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x302
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x234
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x438
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x958
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2445
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x7878
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x152
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x700
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1762
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1655
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4271
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3463
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1665
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3718
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x939
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x855
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x450
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2234
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1330
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1818
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x4030
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1892
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x940
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x364
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x959
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x999
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1514
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x2049
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x11396
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x3170
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x811
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1550
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x189
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x12226
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3690
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x110
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x577
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5396
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6820
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1250
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1174
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x871
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2263
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1136
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x7285
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x6275
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x419
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5728
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x3022
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