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Codeforces Round 937 (Div. 4)
03:30:04
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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
380C
Sereja and Brackets
data structures
,
schedules
2000
x13327
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x10074
2B
The least round way
dp
,
math
2000
x10063
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9778
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9016
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8866
1311D
Three Integers
brute force
,
math
2000
x8537
242E
XOR on Segment
bitmasks
,
data structures
2000
x8259
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8069
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x7784
1349B
Orac and Medians
constructive algorithms
,
greedy
,
math
2000
x7654
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7356
1132F
Clear the String
dp
2000
x7188
540C
Ice Cave
dfs and similar
2000
x6949
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6762
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6661
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x6550
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6441
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6415
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6283
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6188
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6103
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6082
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6062
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6016
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5867
118E
Bertown roads
dfs and similar
,
graphs
2000
x5848
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x5780
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5745
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5733
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5705
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5684
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5622
1268B
Domino for Young
dp
,
greedy
,
math
2000
x5540
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5444
1427C
The Hard Work of Paparazzi
dp
2000
x5439
478D
Red-Green Towers
dp
2000
x5409
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5357
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5255
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5238
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5116
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5041
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5015
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x4971
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x4952
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x4946
710E
Generate a String
dfs and similar
,
dp
2000
x4928
1716D
Chip Move
brute force
,
dp
,
math
2000
x4908
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4892
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4811
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4787
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4731
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4725
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4663
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4662
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4659
451D
Count Good Substrings
math
2000
x4613
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4593
466B
Wonder Room
brute force
,
math
2000
x4565
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4527
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4502
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4490
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4474
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4417
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4403
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4396
598E
Chocolate Bar
brute force
,
dp
2000
x4388
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4369
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4366
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4358
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4350
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4333
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4324
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4302
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4294
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4252
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4216
578C
Weakness and Poorness
ternary search
2000
x4209
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4207
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4205
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4193
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4185
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4155
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4141
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4131
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4124
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4115
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x4104
864E
Fire
dp
,
sortings
2000
x4092
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4090
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4079
961D
Pair Of Lines
geometry
2000
x4071
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4065
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4048
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4034
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4007
797E
Array Queries
brute force
,
data structures
,
dp
2000
x3992
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x3984
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x3975
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x3970
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