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Codeforces Round 961 (Div. 2)
19:06:17
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→ Filter Problems
Difficulty:
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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
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Status
Standings
Custom test
Problems
#
Name
163B
Lemmings
binary search
2000
x1050
163A
Substring and Subsequence
dp
1700
x2643
162J
Brackets
*special problem
1800
x94
162I
Truncatable primes
*special problem
2000
x76
162H
Alternating case
*special problem
1800
x218
162G
Non-decimal sum
*special problem
2000
x61
162F
Factorial zeros
*special problem
1800
x201
162E
HQ9+
*special problem
1800
x177
162D
Remove digits
*special problem
1900
x228
162C
Prime factorization
*special problem
1800
x781
162B
Binary notation
*special problem
1800
x313
162A
Pentagonal numbers
*special problem
,
implementation
1100
x802
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x464
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x14158
161C
Abracadabra
divide and conquer
2400
x643
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1943
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4774
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x581
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2423
160C
Find Pair
implementation
,
math
,
sortings
1700
x3419
160B
Unlucky Ticket
greedy
,
sortings
1100
x13764
160A
Twins
greedy
,
sortings
900
x113907
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x996
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4290
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2955
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3727
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2468
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1453
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6205
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9028
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x84448
158A
Next Round
*special problem
,
implementation
800
x239442
157B
Trace
geometry
,
sortings
1000
x13009
157A
Game Outcome
brute force
800
x7487
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x162
156D
Clues
combinatorics
,
graphs
2500
x1511
156C
Cipher
combinatorics
,
dp
2000
x2347
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2208
156A
Message
brute force
1700
x3022
155B
Combination
greedy
,
sortings
1100
x10111
155A
I_love_\%username\%
brute force
800
x72737
154E
Martian Colony
geometry
3000
x92
154D
Flatland Fencing
games
,
math
2400
x423
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2730
154B
Colliders
math
,
number theory
1600
x4409
154A
Hometask
greedy
1600
x4013
153E
Euclidean Distance
*special problem
2100
x78
153D
Date Change
*special problem
2000
x82
153C
Caesar Cipher
*special problem
2200
x373
153B
Binary notation
*special problem
1800
x155
153A
A + B
*special problem
1600
x768
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x466
152D
Frames
brute force
2600
x240
152C
Pocket Book
combinatorics
1400
x10455
152B
Steps
binary search
,
implementation
1300
x6495
152A
Marks
implementation
900
x16461
151B
Phone Numbers
implementation
,
strings
1200
x6298
151A
Soft Drinking
implementation
,
math
800
x69003
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x822
150D
Mission Impassable
dp
,
strings
2600
x593
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x638
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4052
150A
Win or Freeze
games
,
math
,
number theory
1400
x7670
149E
Martian Strings
string suffix structures
,
strings
2300
x2167
149D
Coloring Brackets
dp
1900
x3676
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5322
149B
Martian Clock
implementation
1600
x2237
149A
Business trip
greedy
,
implementation
,
sortings
900
x38739
148E
Porcelain
dp
1900
x3870
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6972
148C
Terse princess
constructive algorithms
,
greedy
1700
x3081
148B
Escape
implementation
,
math
1500
x5362
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x89615
147B
Smile House
binary search
,
graphs
,
matrices
2500
x765
147A
Punctuation
implementation
,
strings
1300
x3584
146B
Lucky Mask
brute force
,
implementation
1300
x4295
146A
Lucky Ticket
implementation
800
x14837
145E
Lucky Queries
data structures
2400
x2998
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x242
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1899
145B
Lucky Number 2
constructive algorithms
1800
x2171
145A
Lucky Conversion
greedy
,
implementation
1200
x7008
144E
Competition
data structures
,
greedy
2200
x574
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3870
144C
Anagram Search
implementation
,
strings
1500
x3931
144B
Meeting
implementation
1300
x5152
144A
Arrival of the General
implementation
800
x92127
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4952
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13461
142E
Help Greg the Dwarf 2
geometry
3000
x80
142D
Help Shrek and Donkey 2
games
2600
x340
142C
Help Caretaker
brute force
,
dp
2300
x907
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2185
142A
Help Farmer
brute force
,
math
1600
x2590
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x918
141D
Take-off Ramps
graphs
,
shortest paths
2300
x888
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2410
141B
Hopscotch
geometry
,
math
1400
x5246
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x80251
140F
New Year Snowflake
geometry
,
sortings
2600
x365
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