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Codeforces Round 937 (Div. 4)
05:19:17
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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
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1401
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1313
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1311
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1242
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1113
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1095
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1082
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1036
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1001
690C3
Brain Network (hard)
trees
2200
x876
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x801
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x737
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x716
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x641
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x626
440D
Berland Federalization
dp
,
trees
2200
x612
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x606
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x520
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x481
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x369
98B
Help King
implementation
,
probabilities
,
trees
2200
x113
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12350
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x4983
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x2945
543D
Road Improvement
dp
,
trees
2300
x2514
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2489
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2473
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2469
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2450
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2369
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2318
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2219
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2137
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2035
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1946
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1946
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1933
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1893
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1889
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1821
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1789
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1692
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1677
893F
Subtree Minimum Query
data structures
,
trees
2300
x1622
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1603
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1557
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1534
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1510
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1505
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1487
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1454
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1441
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1428
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1396
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1059
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1044
812E
Sagheer and Apple Tree
games
,
trees
2300
x1011
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x970
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x964
573C
Bear and Drawing
constructive algorithms
,
dfs and similar
,
trees
2300
x949
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x896
294E
Shaass the Great
dp
,
trees
2300
x883
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x865
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x859
509F
Progress Monitoring
dp
,
trees
2300
x851
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x846
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x833
1575I
Illusions of the Desert
data structures
,
trees
2300
x826
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x670
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x667
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x629
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x611
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x547
1252B
Cleaning Robots
dp
,
trees
2300
x500
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x474
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x356
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7467
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6065
1051F
The Shortest Statement
graphs
,
shortest paths
,
trees
2400
x2618
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2426
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2362
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2279
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2092
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2006
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1856
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1807
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1708
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1700
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1684
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1499
916E
Jamie and Tree
data structures
,
trees
2400
x1496
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1490
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1452
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1426
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1424
1088E
Ehab and a component choosing problem
dp
,
greedy
,
math
,
trees
2400
x1379
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1374
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1367
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1363
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1359
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