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Codeforces Round 973 (Div. 2)
13:47:17
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Difficulty:
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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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Problems
#
Name
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2164
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x8417
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x962
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1821
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1202
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x11159
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x444
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x239
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x594
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1733
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9584
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x661
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4789
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3555
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x15521
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x5292
1674G
Remove Directed Edges
dfs and similar
,
dp
,
graphs
2000
x2483
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x804
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1740
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9917
1669G
Fall Down
dfs and similar
,
implementation
1200
x18172
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x660
1666L
Labyrinth
dfs and similar
,
graphs
1800
x3090
1662O
Circular Maze
brute force
,
dfs and similar
,
graphs
,
implementation
x1339
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x1029
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17664
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x191
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1547
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x574
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3434
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x393
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2837
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x517
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x5077
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2469
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x121
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x396
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x990
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3716
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1763
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2212
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1679
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1519
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x973
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1154
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x14456
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1564
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x594
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x1038
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5896
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1096
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x14070
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x178
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6877
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2392
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4185
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x864
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x279
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1467
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1884
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5157
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3807
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7246
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x492
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x530
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x157
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6623
1607F
Robot on the Board 2
brute force
,
dfs and similar
,
graphs
,
implementation
2300
x1935
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2922
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x176
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4934
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3888
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2295
1598A
Computer Game
brute force
,
dfs and similar
,
dp
,
implementation
800
x23236
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7459
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2432
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x12326
1593B
Make it Divisible by 25
dfs and similar
,
dp
,
greedy
,
math
,
math
900
x26960
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2221
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7935
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1050
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2210
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x231
1575D
Divisible by Twenty-Five
brute force
,
dfs and similar
,
dp
1800
x2514
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x620
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4478
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x237
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x747
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4110
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4368
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x6124
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2630
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x470
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1218
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3317
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x128
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x527
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6985
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1831
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x24309
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