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Educational Codeforces Round 195 (Rated for Div. 2)
11:31:05
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
#
Name
203A
Two Problems
brute force
,
implementation
1200
x4497
198B
Jumping on Walls
shortest paths
1400
x5490
197B
Limit
math
1400
x4977
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5924
195B
After Training
data structures
,
implementation
,
math
1300
x5562
194B
Square
math
1200
x4059
192B
Walking in the Rain
brute force
,
implementation
1100
x6889
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x11757
191A
Dynasty Puzzles
dp
1500
x4695
190C
STL
dfs and similar
1500
x3289
190A
Vasya and the Bus
greedy
,
math
1100
x6372
189B
Counting Rhombi
brute force
,
math
1300
x4274
189A
Cut Ribbon
brute force
,
dp
1300
x85906
188F
Binary Notation
*special problem
,
implementation
1400
x352
188E
HQ9+
*special problem
,
implementation
1400
x559
188D
Asterisks
*special problem
,
implementation
1100
x761
188C
LCM
*special problem
,
implementation
,
math
1400
x534
188B
A + Reverse B
*special problem
,
implementation
1300
x817
188A
Hexagonal Numbers
*special problem
1100
x869
187A
Permutations
greedy
1500
x3093
186B
Growing Mushrooms
greedy
,
sortings
1200
x6281
186A
Comparing Strings
implementation
,
strings
1100
x18820
185A
Plant
math
1300
x6708
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x9545
181B
Number of Triplets
binary search
,
brute force
1300
x3626
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2950
180C
Letter
dp
1400
x8824
178D1
Magic Squares
1500
x750
178A3
Educational Game
greedy
1100
x1691
177D2
Encrypting Messages
data structures
1500
x2883
177D1
Encrypting Messages
brute force
1200
x2826
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x3128
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x3095
177B2
Rectangular Game
number theory
1200
x3478
176A
Trading Business
greedy
,
sortings
1200
x1876
175B
Plane of Tanks: Pro
implementation
1400
x1605
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2621
174B
File List
dp
,
greedy
,
implementation
1400
x2554
174A
Problem About Equation
math
1100
x3402
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2579
172D
Calendar Reform
*special problem
,
number theory
1500
x1547
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1267
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x3198
171D
Broken checker
*special problem
,
brute force
1300
x2849
171B
Star
*special problem
,
combinatorics
1300
x4956
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x5172
169B
Replacing Digits
greedy
1100
x3793
166E
Tetrahedron
dp
,
math
,
matrices
1500
x27050
166C
Median
greedy
,
math
,
sortings
1500
x7694
166A
Rank List
binary search
,
implementation
,
sortings
1100
x21682
165B
Burning Midnight Oil
binary search
,
implementation
1500
x24377
162A
Pentagonal numbers
*special problem
,
implementation
1100
x848
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x5635
160B
Unlucky Ticket
greedy
,
sortings
1100
x15906
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4770
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x3242
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x4244
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2680
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6556
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x10713
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x109137
155B
Combination
greedy
,
sortings
1100
x11061
152C
Pocket Book
combinatorics
1400
x11832
152B
Steps
binary search
,
implementation
1300
x7529
151B
Phone Numbers
implementation
,
strings
1200
x6976
150A
Win or Freeze
games
,
math
,
number theory
1400
x8817
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5826
148B
Escape
implementation
,
math
1500
x6109
147A
Punctuation
implementation
,
strings
1300
x4327
146B
Lucky Mask
brute force
,
implementation
1300
x5132
145A
Lucky Conversion
greedy
,
implementation
1200
x8073
144C
Anagram Search
implementation
,
strings
1500
x4294
144B
Meeting
implementation
1300
x5775
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x5395
141B
Hopscotch
geometry
,
math
1400
x5883
137C
History
sortings
1500
x7950
136B
Ternary Logic
implementation
,
math
1100
x5522
135A
Replacement
greedy
,
implementation
,
sortings
1300
x8359
134A
Average Numbers
brute force
,
implementation
1200
x5108
133B
Unary
implementation
1200
x9535
132A
Turing Tape
implementation
1300
x3022
131C
The World is a Theatre
combinatorics
,
math
1400
x12957
131B
Opposites Attract
implementation
,
math
1200
x7728
130D
Exponentiation
*special problem
1500
x434
130C
Decimal sum
*special problem
1500
x544
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x571
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x14286
128A
Statues
dfs and similar
1500
x3560
125A
Measuring Lengths in Baden
math
1400
x3331
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x5107
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x4125
121B
Lucky Transformation
strings
1500
x2875
121A
Lucky Sum
implementation
1100
x10813
120F
Spiders
dp
,
greedy
,
trees
1400
x4220
120E
Put Knight!
games
,
math
1400
x3038
120D
Three Sons
brute force
1400
x2121
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x4030
120B
Quiz League
implementation
1100
x3712
117A
Elevator
implementation
,
math
1300
x2251
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x14773
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