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Codeforces Round 973 (Div. 2)
13:21:50
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Difficulty:
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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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Status
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Custom test
Problems
#
Name
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1033
195B
After Training
data structures
,
implementation
,
math
1300
x5181
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x8949
194B
Square
math
1200
x3504
194A
Exams
implementation
,
math
900
x9845
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x332
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x511
190A
Vasya and the Bus
greedy
,
math
1100
x5846
189B
Counting Rhombi
brute force
,
math
1300
x3939
188C
LCM
*special problem
,
implementation
,
math
1400
x451
185D
Visit of the Great
math
,
number theory
2600
x422
185B
Mushroom Scientists
math
,
ternary search
1800
x1628
185A
Plant
math
1300
x5851
183A
Headquarters
constructive algorithms
,
math
1700
x541
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8024
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2501
180B
Divisibility Rules
math
,
number theory
2300
x338
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x296
174A
Problem About Equation
math
1100
x2784
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2282
168A
Wizards and Demonstration
implementation
,
math
900
x10501
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x572
167C
Wizards and Numbers
games
,
math
2300
x662
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2139
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2026
166E
Tetrahedron
dp
,
math
,
matrices
1500
x20916
166C
Median
greedy
,
math
,
sortings
1500
x6467
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12186
160C
Find Pair
implementation
,
math
,
sortings
1700
x3440
154D
Flatland Fencing
games
,
math
2400
x429
154B
Colliders
math
,
number theory
1600
x4559
151A
Soft Drinking
implementation
,
math
800
x71910
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x641
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4118
150A
Win or Freeze
games
,
math
,
number theory
1400
x7747
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5368
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7158
148B
Escape
implementation
,
math
1500
x5448
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x91755
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1906
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13758
142A
Help Farmer
brute force
,
math
1600
x2605
141B
Hopscotch
geometry
,
math
1400
x5326
140A
New Year Table
geometry
,
math
1700
x4131
139B
Wallpaper
implementation
,
math
1600
x1293
136B
Ternary Logic
implementation
,
math
1100
x4845
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2338
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2012
131C
The World is a Theatre
combinatorics
,
math
1400
x11050
131B
Opposites Attract
implementation
,
math
1200
x7021
128E
Birthday
geometry
,
math
2900
x97
126D
Fibonacci Sums
dp
,
math
2300
x828
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1429
125A
Measuring Lengths in Baden
math
1400
x2708
124A
The number of positions
math
1000
x38069
123B
Squares
math
1800
x1109
120E
Put Knight!
games
,
math
1400
x2720
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3656
120A
Elevator
brute force
,
implementation
,
math
1000
x4580
117D
Not Quick Transformation
divide and conquer
,
math
2500
x334
117A
Elevator
implementation
,
math
1300
x2002
115C
Plumber
math
2200
x595
114A
Cifera
math
1000
x14083
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x119
113D
Museum
math
,
matrices
,
probabilities
2700
x674
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1232
112B
Petya and Square
implementation
,
math
1200
x4132
109E
Lucky Interval
brute force
,
math
2700
x101
108B
Datatypes
math
,
sortings
1400
x2453
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3443
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5960
101C
Vectors
implementation
,
math
2000
x697
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x62
100I
Rotation
*special problem
,
geometry
,
math
1500
x348
100E
Lamps in a Line
*special problem
,
math
1600
x271
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x476
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x302
95D
Horse Races
dp
,
math
2500
x425
94B
Friends
graphs
,
implementation
,
math
1300
x4646
93E
Lostborn
dp
,
math
,
number theory
2600
x498
93D
Flags
dp
,
math
,
matrices
2500
x347
92A
Chips
implementation
,
math
800
x18698
90A
Cableway
greedy
,
math
1000
x4667
87C
Interesting Game
dp
,
games
,
math
2000
x1343
87A
Trains
implementation
,
math
1500
x5339
86E
Long sequence
brute force
,
math
,
matrices
2700
x188
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x13527
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x411
86A
Reflection
math
1600
x1367
84A
Toy Army
math
,
number theory
900
x14923
83D
Numbers
dp
,
math
,
number theory
2400
x852
83B
Doctor
binary search
,
math
,
sortings
1800
x1641
83A
Magical Array
math
1300
x6200
82A
Double Cola
implementation
,
math
1100
x30094
81C
Average Score
greedy
,
math
,
sortings
1700
x1659
80B
Depression
geometry
,
math
1200
x4385
79E
Security System
math
2900
x131
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x310
77B
Falling Anvils
math
,
probabilities
1800
x2608
76E
Points
implementation
,
math
1700
x1706
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