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Problems
#
Name
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1054
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x1992
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2782
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13164
1654B
Prefix Removals
strings
800
x15479
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18416
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x362
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x494
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4833
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10474
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x19358
1651A
Playoff
implementation
800
x25362
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2340
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1384
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4021
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x12686
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16386
1650B
DIV + MOD
math
900
x26857
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x33921
1649B
Game of Ball Passing
greedy
,
implementation
1300
x12779
1649A
Game
implementation
800
x15396
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x103
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x384
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x793
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2865
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6196
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11792
1647F
Madoka and Laziness
dp
,
greedy
3100
x377
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x956
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5122
1647C
Madoka and Childish Pranks
constructive algorithms
,
greedy
1300
x12381
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15073
1647A
Madoka and Math Dad
implementation
,
math
800
x22489
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x402
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2301
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3549
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13218
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20874
1646A
Square Counting
math
800
x23997
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x313
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3008
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x6997
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x13381
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20462
1644A
Doors and Keys
implementation
800
x26908
1642B
Power Walking
greedy
900
x16611
1642A
Hard Way
geometry
800
x15987
1641F
Covering Circle
geometry
3500
x94
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x203
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1049
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2332
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3731
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x17539
1639K
Treasure Hunt
graphs
,
interactive
1639J
Treasure Hunt
graphs
,
interactive
1639I
Treasure Hunt
graphs
,
interactive
1639H
Treasure Hunt
graphs
,
interactive
1639G
Treasure Hunt
graphs
,
interactive
1639F
Treasure Hunt
graphs
,
interactive
1639E
Treasure Hunt
graphs
,
interactive
1639D
Treasure Hunt
graphs
,
interactive
1639C
Treasure Hunt
graphs
,
interactive
1639B
Treasure Hunt
graphs
,
interactive
1639A
Treasure Hunt
graphs
,
interactive
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1793
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4050
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14381
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20419
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x21219
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x456
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1695
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3190
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7373
1637C
Andrew and Stones
greedy
,
implementation
1200
x17353
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x14618
1637A
Sorting Parts
brute force
,
sortings
800
x22085
1635F
Closest Pair
data structures
,
greedy
2800
x980
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2168
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6009
1635C
Differential Sorting
constructive algorithms
,
greedy
1200
x16399
1635B
Avoid Local Maximums
greedy
800
x17799
1635A
Min Or Sum
bitmasks
,
greedy
800
x22099
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1528
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1598
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4235
1634C
OKEA
constructive algorithms
1000
x17944
1634B
Fortune Telling
bitmasks
,
math
1400
x15702
1634A
Reverse and Concatenate
greedy
,
strings
800
x23652
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x308
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1459
1633D
Make Them Equal
dp
,
greedy
1600
x13053
1633C
Kill the Monster
brute force
,
math
1100
x19633
1633B
Minority
greedy
800
x27240
1633A
Div. 7
brute force
800
x31919
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x928
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1110
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4470
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12258
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Codeforces Round 945 (Div. 2)
42:32:40
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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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