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Codeforces Round (Div. 1 + Div. 2)
2 days
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math
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
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7831
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2458
180B
Divisibility Rules
math
,
number theory
2300
x327
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x293
174A
Problem About Equation
math
1100
x2720
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2204
168A
Wizards and Demonstration
implementation
,
math
900
x10327
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x546
167C
Wizards and Numbers
games
,
math
2300
x657
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2095
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2013
166E
Tetrahedron
dp
,
math
,
matrices
1500
x20044
166C
Median
greedy
,
math
,
sortings
1500
x6358
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11901
160C
Find Pair
implementation
,
math
,
sortings
1700
x3384
154D
Flatland Fencing
games
,
math
2400
x418
154B
Colliders
math
,
number theory
1600
x4277
151A
Soft Drinking
implementation
,
math
800
x66358
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x630
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3973
150A
Win or Freeze
games
,
math
,
number theory
1400
x7598
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5268
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6815
148B
Escape
implementation
,
math
1500
x5273
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x87596
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1888
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13102
142A
Help Farmer
brute force
,
math
1600
x2577
141B
Hopscotch
geometry
,
math
1400
x5147
140A
New Year Table
geometry
,
math
1700
x4091
139B
Wallpaper
implementation
,
math
1600
x1274
136B
Ternary Logic
implementation
,
math
1100
x4705
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2299
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1921
131C
The World is a Theatre
combinatorics
,
math
1400
x10689
131B
Opposites Attract
implementation
,
math
1200
x6867
128E
Birthday
geometry
,
math
2900
x96
126D
Fibonacci Sums
dp
,
math
2300
x807
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1406
125A
Measuring Lengths in Baden
math
1400
x2644
124A
The number of positions
math
1000
x36454
123B
Squares
math
1800
x1095
120E
Put Knight!
games
,
math
1400
x2650
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3587
120A
Elevator
brute force
,
implementation
,
math
1000
x4506
117D
Not Quick Transformation
divide and conquer
,
math
2500
x330
117A
Elevator
implementation
,
math
1300
x1974
115C
Plumber
math
2200
x588
114A
Cifera
math
1000
x13881
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x116
113D
Museum
math
,
matrices
,
probabilities
2700
x652
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1202
112B
Petya and Square
implementation
,
math
1200
x4072
109E
Lucky Interval
brute force
,
math
2700
x98
108B
Datatypes
math
,
sortings
1400
x2418
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3297
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5871
101C
Vectors
implementation
,
math
2000
x685
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x60
100I
Rotation
*special problem
,
geometry
,
math
1500
x340
100E
Lamps in a Line
*special problem
,
math
1600
x266
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x443
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x297
95D
Horse Races
dp
,
math
2500
x415
94B
Friends
graphs
,
implementation
,
math
1300
x4509
93E
Lostborn
dp
,
math
,
number theory
2600
x434
93D
Flags
dp
,
math
,
matrices
2500
x334
92A
Chips
implementation
,
math
800
x18257
90A
Cableway
greedy
,
math
1000
x4520
87C
Interesting Game
dp
,
games
,
math
2000
x1310
87A
Trains
implementation
,
math
1500
x5189
86E
Long sequence
brute force
,
math
,
matrices
2700
x179
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12619
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x401
86A
Reflection
math
1600
x1342
84A
Toy Army
math
,
number theory
900
x14611
83D
Numbers
dp
,
math
,
number theory
2400
x823
83B
Doctor
binary search
,
math
,
sortings
1800
x1617
83A
Magical Array
math
1300
x6089
82A
Double Cola
implementation
,
math
1100
x29512
81C
Average Score
greedy
,
math
,
sortings
1700
x1626
80B
Depression
geometry
,
math
1200
x4229
79E
Security System
math
2900
x121
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x302
77B
Falling Anvils
math
,
probabilities
1800
x2552
76E
Points
implementation
,
math
1700
x1661
76D
Plus and xor
dp
,
greedy
,
math
1700
x2004
76C
Mutation
bitmasks
,
dp
,
math
2700
x270
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1740
73E
Morrowindows
math
,
number theory
2400
x323
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1297
72F
Oil
*special problem
,
greedy
,
math
1900
x116
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x903
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x181
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6252
71B
Progress Bar
implementation
,
math
1300
x4375
70A
Cookies
math
1300
x3226
69A
Young Physicist
implementation
,
math
1000
x155946
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x450
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3059
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