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Codeforces Round 1002 (Div. 2)
46:47:07
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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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Custom test
Problems
#
Name
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x708
101C
Vectors
implementation
,
math
2000
x709
101B
Buses
binary search
,
data structures
,
dp
1700
x2656
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x66
100I
Rotation
*special problem
,
geometry
,
math
1500
x359
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x84
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x128
100F
Polynom
*special problem
,
implementation
1800
x145
100E
Lamps in a Line
*special problem
,
math
1600
x279
100D
World of Mouth
*special problem
,
strings
1500
x312
100C
A+B
*special problem
,
implementation
1400
x551
100B
Friendly Numbers
*special problem
,
implementation
1500
x552
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x488
98D
Help Monks
constructive algorithms
2500
x188
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x314
98B
Help King
implementation
,
probabilities
,
trees
2200
x132
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1219
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x387
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x250
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x307
97B
Superset
constructive algorithms
,
divide and conquer
2300
x871
97A
Domino
brute force
,
implementation
2400
x268
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1561
95D
Horse Races
dp
,
math
2500
x459
95C
Volleyball
shortest paths
1900
x2853
95B
Lucky Numbers
dp
,
greedy
1800
x1263
95A
Hockey
implementation
,
strings
1600
x1701
93E
Lostborn
dp
,
math
,
number theory
2600
x506
93D
Flags
dp
,
math
,
matrices
2500
x361
93C
Azembler
brute force
,
implementation
2500
x434
93B
End of Exams
greedy
1900
x925
93A
Frames
implementation
1700
x1973
91E
Igloo Skyscraper
data structures
,
geometry
2500
x615
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x278
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x908
91B
Queue
binary search
,
data structures
1500
x6954
91A
Newspaper Headline
greedy
,
strings
1500
x3669
89E
Fire and Ice
greedy
2900
x102
89D
Space mines
geometry
2500
x242
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x630
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x528
89A
Robbery
greedy
1800
x1493
88B
Keyboard
implementation
1500
x4803
87E
Mogohu-Rea Idol
geometry
2600
x614
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x918
87C
Interesting Game
dp
,
games
,
math
2000
x1421
87B
Vasya and Types
implementation
,
strings
1800
x1157
87A
Trains
implementation
,
math
1500
x5450
86E
Long sequence
brute force
,
math
,
matrices
2700
x192
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x14227
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x740
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x418
86A
Reflection
math
1600
x1455
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x992
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x2086
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x567
85B
Embassy Queue
data structures
,
greedy
1800
x989
84C
Biathlon
binary search
,
implementation
1700
x1731
83E
Two Subsequences
bitmasks
,
dp
2800
x486
83D
Numbers
dp
,
math
,
number theory
2400
x915
83C
Track
graphs
,
greedy
,
shortest paths
2400
x436
83B
Doctor
binary search
,
math
,
sortings
1800
x1721
82E
Corridor
geometry
2600
x219
82D
Two out of Three
dp
2000
x2089
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x820
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2074
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x357
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x666
81C
Average Score
greedy
,
math
,
sortings
1700
x1679
81B
Sequence Formatting
implementation
,
strings
1700
x1969
81A
Plug-in
implementation
1400
x11337
79E
Security System
math
2900
x138
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x1211
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1853
79B
Colorful Field
implementation
,
sortings
1400
x7409
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x597
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x336
78C
Beaver Game
dp
,
games
,
number theory
2000
x1909
77E
Martian Food
geometry
2800
x382
77D
Domino Carpet
dp
,
implementation
2300
x332
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x1049
77B
Falling Anvils
math
,
probabilities
1800
x2680
77A
Heroes
brute force
,
implementation
1400
x1786
76F
Tourist
binary search
,
data structures
,
dp
2300
x651
76E
Points
implementation
,
math
1700
x1734
76D
Plus and xor
dp
,
greedy
,
math
1700
x2102
76C
Mutation
bitmasks
,
dp
,
math
2700
x336
76B
Mice
greedy
,
two pointers
2100
x763
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1742
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x281
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1859
75C
Modified GCD
binary search
,
number theory
1600
x13128
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3348
74E
Shift It!
constructive algorithms
2800
x166
74D
Hanger
data structures
2400
x374
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x1308
74B
Train
dp
,
games
,
greedy
1500
x1563
73F
Plane of Tanks
brute force
,
geometry
2900
x81
73E
Morrowindows
math
,
number theory
2400
x367
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x646
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