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Codeforces Round 973 (Div. 2)
15:52:51
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Difficulty:
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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
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
x5735
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
x4070
2001E2
Deterministic Heap (Hard Version)
combinatorics
,
dp
,
trees
2900
x180
2001E1
Deterministic Heap (Easy Version)
combinatorics
,
dp
,
math
,
trees
2400
x1119
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10000
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
1994E
Wooden Game
bitmasks
,
greedy
,
math
,
trees
2000
x4199
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5409
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
1988D
The Omnipotent Monster Killer
brute force
,
dfs and similar
,
dp
,
trees
2000
x4650
1987G2
Spinning Round (Hard Version)
divide and conquer
,
dp
,
trees
3500
x147
1987G1
Spinning Round (Easy Version)
divide and conquer
,
dp
,
trees
2900
x252
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x3196
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x4319
1984E
Shuffle
dp
,
greedy
,
trees
2400
x1343
1983G
Your Loss
bitmasks
,
brute force
,
dp
,
trees
3000
x203
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x246
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x1182
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
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
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
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x433
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x419
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1666
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x419
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x465
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x267
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8926
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x369
1949F
Dating
greedy
,
sortings
,
trees
2200
x925
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1639
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x675
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x10604
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2040
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x90
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x35
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
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x152
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x333
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
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4670
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
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3717
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x446
1919H
Tree Diameter
interactive
,
trees
2000
x142
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x179
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3818
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x854
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x945
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x147
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2234
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1817
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x4030
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x3087
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x174
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x940
1905B
Begginer's Zelda
greedy
,
trees
1100
x16243
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
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x612
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x999
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x4236
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1514
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
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x7508
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5982
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3690
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x79
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
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x871
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5395
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6818
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
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x123
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x267
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x7285
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x85
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x285
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1135
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x442
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2578
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x77
1863H
Goldberg Machine 3
dp
,
trees
3500
x76
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