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Codeforces Round 950 (Div. 3)
13:01:27
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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
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2656
1667B
Optimal Partition
data structures
,
dp
2100
x3501
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1295
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3730
1661D
Progressions Covering
data structures
,
greedy
1900
x4549
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2614
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3899
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4731
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6667
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2792
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4864
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2350
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4035
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2876
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5142
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3570
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3013
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3743
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4064
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3199
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4245
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4497
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3030
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7888
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3808
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5606
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3197
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3976
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3895
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3982
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7861
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4059
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2288
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x2032
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4067
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4737
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3674
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5018
1613D
MEX Sequences
dp
,
math
1900
x4455
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2399
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3676
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2600
1606E
Arena
combinatorics
,
dp
,
math
2100
x3363
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2847
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4798
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1943
1599H
Hidden Fortress
interactive
,
math
2100
x1016
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1569
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2251
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2365
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4833
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3648
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3574
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3610
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1288
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4375
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x178
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4308
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4421
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4031
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4224
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5951
1558C
Bottom-Tier Reversals
constructive algorithms
,
greedy
2000
x3177
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4631
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3879
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3249
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3723
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2671
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2887
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5571
1545B
AquaMoon and Chess
combinatorics
,
math
1900
x5670
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5197
1538G
Gift Set
binary search
,
greedy
,
math
,
ternary search
2100
x4389
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2820
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4571
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2906
1527B2
Palindrome Game (hard version)
constructive algorithms
,
games
1900
x7609
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1974
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4343
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4289
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4119
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4112
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5089
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x5979
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2472
1510G
Guide
2100
x1260
1510D
Digits
dp
,
math
,
number theory
2100
x1805
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6038
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4116
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3115
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5520
1495B
Let's Go Hiking
games
,
greedy
1900
x5857
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5249
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4771
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4476
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5953
1490G
Old Floppy Drive
binary search
,
data structures
,
math
1900
x5508
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x332
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x401
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4392
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