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Educational Codeforces Round 169 (Rated for Div. 2)
16:37:25
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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
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Custom test
Problems
#
Name
195B
After Training
data structures
,
implementation
,
math
1300
x5159
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3940
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10291
191B
Demonstration
greedy
1700
x1004
191A
Dynasty Puzzles
dp
1500
x3901
190C
STL
dfs and similar
1500
x2787
189B
Counting Rhombi
brute force
,
math
1300
x3922
189A
Cut Ribbon
brute force
,
dp
1300
x65215
188G
Array Sorting
*special problem
,
implementation
1600
x331
188F
Binary Notation
*special problem
,
implementation
1400
x295
188E
HQ9+
*special problem
,
implementation
1400
x497
188C
LCM
*special problem
,
implementation
,
math
1400
x446
188B
A + Reverse B
*special problem
,
implementation
1300
x724
187A
Permutations
greedy
1500
x2740
185A
Plant
math
1300
x5814
183B
Zoo
brute force
,
geometry
1700
x685
183A
Headquarters
constructive algorithms
,
math
1700
x537
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7960
181B
Number of Triplets
binary search
,
brute force
1300
x2960
180C
Letter
dp
1400
x7248
178D1
Magic Squares
1500
x625
178C1
Smart Beaver and Resolving Collisions
1600
x475
178B2
Greedy Merchants
1600
x666
178B1
Greedy Merchants
1600
x752
177E1
Space Voyage
binary search
1700
x591
177D2
Encrypting Messages
data structures
1500
x1891
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2506
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2517
176B
Word Cut
dp
1700
x1769
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1305
175B
Plane of Tanks: Pro
implementation
1400
x1403
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2370
174B
File List
dp
,
greedy
,
implementation
1400
x2218
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2265
172D
Calendar Reform
*special problem
,
number theory
1500
x1391
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1133
171H
A polyline
*special problem
,
implementation
1700
x273
171G
Mysterious numbers - 2
*special problem
1600
x915
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1265
171D
Broken checker
*special problem
,
brute force
1300
x2555
171B
Star
*special problem
,
combinatorics
1300
x4007
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1210
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2022
166E
Tetrahedron
dp
,
math
,
matrices
1500
x20679
166C
Median
greedy
,
math
,
sortings
1500
x6425
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12117
165B
Burning Midnight Oil
binary search
,
implementation
1500
x17328
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1000
163A
Substring and Subsequence
dp
1700
x2667
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1945
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4795
160C
Find Pair
implementation
,
math
,
sortings
1700
x3419
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x996
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4292
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2965
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2471
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6218
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9072
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2212
156A
Message
brute force
1700
x3023
154B
Colliders
math
,
number theory
1600
x4438
154A
Hometask
greedy
1600
x4019
153A
A + B
*special problem
1600
x769
152C
Pocket Book
combinatorics
1400
x10484
152B
Steps
binary search
,
implementation
1300
x6551
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4082
150A
Win or Freeze
games
,
math
,
number theory
1400
x7696
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5340
149B
Martian Clock
implementation
1600
x2240
148C
Terse princess
constructive algorithms
,
greedy
1700
x3086
148B
Escape
implementation
,
math
1500
x5389
147A
Punctuation
implementation
,
strings
1300
x3600
146B
Lucky Mask
brute force
,
implementation
1300
x4312
144C
Anagram Search
implementation
,
strings
1500
x3971
144B
Meeting
implementation
1300
x5176
142A
Help Farmer
brute force
,
math
1600
x2597
141B
Hopscotch
geometry
,
math
1400
x5290
140A
New Year Table
geometry
,
math
1700
x4122
139B
Wallpaper
implementation
,
math
1600
x1291
138A
Literature Lesson
implementation
1600
x2374
137C
History
sortings
1500
x7155
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2327
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7504
132A
Turing Tape
implementation
1300
x2757
131E
Yet Another Task with Queens
sortings
1700
x1831
131D
Subway
dfs and similar
,
graphs
1600
x4613
131C
The World is a Theatre
combinatorics
,
math
1400
x10957
130H
Balanced brackets
*special problem
1600
x549
130G
CAPS LOCK ON
*special problem
1700
x284
130F
Prime factorization
*special problem
1600
x277
130E
Tribonacci numbers
*special problem
1600
x296
130D
Exponentiation
*special problem
1500
x392
130C
Decimal sum
*special problem
1500
x493
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x525
128A
Statues
dfs and similar
1500
x3161
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x18922
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x914
125A
Measuring Lengths in Baden
math
1400
x2679
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3848
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3561
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