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Problems
#
Name
171C
A Piece of Cake
*special problem
,
implementation
2000
x1024
171B
Star
*special problem
,
combinatorics
1300
x3828
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4204
169B
Replacing Digits
greedy
1100
x3163
169A
Chores
sortings
800
x6501
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1195
168A
Wizards and Demonstration
implementation
,
math
900
x10233
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x536
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x188
167C
Wizards and Numbers
games
,
math
2300
x655
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2071
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2002
166E
Tetrahedron
dp
,
math
,
matrices
1500
x19659
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x342
166C
Median
greedy
,
math
,
sortings
1500
x6302
166B
Polygons
geometry
,
sortings
2100
x2035
166A
Rank List
binary search
,
implementation
,
sortings
1100
x16438
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6083
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1564
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11771
165B
Burning Midnight Oil
binary search
,
implementation
1500
x16187
165A
Supercentral Point
implementation
1000
x22386
164E
Polycarpus and Tasks
3100
x65
164D
Minimum Diameter
binary search
,
brute force
3100
x228
164C
Machine Programming
flows
,
graphs
2400
x856
164B
Ancient Berland Hieroglyphs
two pointers
2000
x449
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x968
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1492
163D
Large Refrigerator
brute force
2900
x477
163C
Conveyor
sortings
,
two pointers
2100
x535
163B
Lemmings
binary search
2000
x1042
163A
Substring and Subsequence
dp
1700
x2592
162J
Brackets
*special problem
1800
x88
162I
Truncatable primes
*special problem
2000
x71
162H
Alternating case
*special problem
1800
x212
162G
Non-decimal sum
*special problem
2000
x55
162F
Factorial zeros
*special problem
1800
x193
162E
HQ9+
*special problem
1800
x173
162D
Remove digits
*special problem
1900
x223
162C
Prime factorization
*special problem
1800
x679
162B
Binary notation
*special problem
1800
x307
162A
Pentagonal numbers
*special problem
,
implementation
1100
x788
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x461
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13297
161C
Abracadabra
divide and conquer
2400
x636
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1917
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4659
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x571
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2335
160C
Find Pair
implementation
,
math
,
sortings
1700
x3370
160B
Unlucky Ticket
greedy
,
sortings
1100
x13381
160A
Twins
greedy
,
sortings
900
x109298
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x986
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4225
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2899
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3658
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2449
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1447
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6162
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8619
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x81492
158A
Next Round
*special problem
,
implementation
800
x229042
157B
Trace
geometry
,
sortings
1000
x12789
157A
Game Outcome
brute force
800
x7377
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x159
156D
Clues
combinatorics
,
graphs
2500
x1442
156C
Cipher
combinatorics
,
dp
2000
x2265
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2168
156A
Message
brute force
1700
x2983
155B
Combination
greedy
,
sortings
1100
x9930
155A
I_love_\%username\%
brute force
800
x69626
154E
Martian Colony
geometry
3000
x87
154D
Flatland Fencing
games
,
math
2400
x412
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2641
154B
Colliders
math
,
number theory
1600
x4194
154A
Hometask
greedy
1600
x3950
153E
Euclidean Distance
*special problem
2100
x71
153D
Date Change
*special problem
2000
x76
153C
Caesar Cipher
*special problem
2200
x351
153B
Binary notation
*special problem
1800
x148
153A
A + B
*special problem
1600
x751
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x443
152D
Frames
brute force
2600
x237
152C
Pocket Book
combinatorics
1400
x10203
152B
Steps
binary search
,
implementation
1300
x6267
152A
Marks
implementation
900
x16042
151B
Phone Numbers
implementation
,
strings
1200
x6191
151A
Soft Drinking
implementation
,
math
800
x64318
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x771
150D
Mission Impassable
dp
,
strings
2600
x579
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x623
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x3922
150A
Win or Freeze
games
,
math
,
number theory
1400
x7524
149E
Martian Strings
string suffix structures
,
strings
2300
x1954
149D
Coloring Brackets
dp
1900
x3516
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5237
149B
Martian Clock
implementation
1600
x2205
149A
Business trip
greedy
,
implementation
,
sortings
900
x37212
148E
Porcelain
dp
1900
x3724
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6640
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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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