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Codeforces Round 940 (Div. 2) and CodeCraft-23
22:44:56
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Difficulty:
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dsu
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
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2520
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x487
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x657
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x662
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x682
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x689
1044D
Deduction Queries
data structures
,
dsu
2400
x967
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x984
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1022
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1046
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1081
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1128
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1141
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1233
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1284
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1289
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1373
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1378
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1434
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1454
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1503
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1505
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1520
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1679
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1714
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1715
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1872
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2015
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2295
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2414
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x304
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x384
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x539
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x799
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x843
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x847
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x972
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x984
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1129
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1147
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1174
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1296
500E
New Year Domino
data structures
,
dp
,
dsu
2300
x1387
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1437
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1441
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1485
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1523
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1732
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1896
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1944
891C
Envy
data structures
,
dsu
,
graphs
2300
x2206
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2340
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2344
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2484
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5058
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12543
45B
School
dp
,
dsu
2200
x265
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1087
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1311
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1406
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1428
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1454
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1469
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1677
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1725
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1824
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1938
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1958
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2161
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2303
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2353
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2354
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2539
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2736
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3524
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x893
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x947
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x977
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1059
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1257
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1309
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1429
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1578
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1638
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1644
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1770
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2052
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2277
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2316
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2322
1108F
MST Unification
binary search
,
dsu
,
graphs
,
greedy
2100
x2542
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2635
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2786
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2950
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3227
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3557
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3684
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5114
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5744
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