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Educational Codeforces Round 169 (Rated for Div. 2)
12:13:33
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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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Custom test
Problems
#
Name
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x5024
375A
Divisible by Seven
math
,
number theory
1600
x4776
374B
Inna and Nine
combinatorics
,
greedy
1500
x3268
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2460
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12655
371C
Hamburgers
binary search
,
brute force
1600
x25324
371B
Fox Dividing Cheese
math
,
number theory
1300
x11212
370B
Berland Bingo
implementation
1300
x2504
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9704
369B
Valera and Contest
constructive algorithms
,
implementation
,
math
1400
x6402
367A
Sereja and Algorithm
data structures
,
implementation
1500
x4304
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4650
363C
Fixing Typos
greedy
,
implementation
1400
x13217
362A
Two Semiknights Meet
greedy
,
math
1500
x2647
360A
Levko and Array Recovery
greedy
,
implementation
1700
x2046
359B
Permutation
constructive algorithms
,
dp
,
math
1400
x7880
358B
Dima and Text Messages
brute force
,
strings
1500
x3706
358A
Dima and Continuous Line
brute force
,
implementation
1400
x7687
357B
Flag Day
constructive algorithms
,
implementation
1400
x8127
356A
Knight Tournament
data structures
,
dsu
1500
x13283
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5457
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4793
352B
Jeff and Periods
implementation
,
sortings
1300
x16216
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6517
350B
Resort
graphs
1500
x3106
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13835
348A
Mafia
binary search
,
math
,
sortings
1600
x12895
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x8901
346A
Alice and Bob
games
,
math
,
number theory
1600
x8615
345A
Expecting Trouble
*special problem
,
probabilities
1500
x482
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13498
343A
Rational Resistance
math
,
number theory
1600
x8655
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x4006
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7126
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4201
339D
Xenia and Bit Operations
data structures
,
trees
1700
x24926
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8250
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4859
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9260
335A
Banana
binary search
,
constructive algorithms
,
greedy
1400
x2546
334B
Eight Point Sets
sortings
1400
x3568
333A
Secrets
greedy
1600
x3960
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x7941
332A
Down the Hatch!
implementation
1300
x3547
331B1
Shave Beaver!
implementation
1700
x733
331A2
Oh Sweet Beaverette
data structures
,
sortings
1500
x1400
331A1
Oh Sweet Beaverette
brute force
,
implementation
1400
x1355
330B
Road Construction
constructive algorithms
,
graphs
1300
x16669
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x6286
329A
Purification
constructive algorithms
,
greedy
1500
x4623
328B
Sheldon and Ice Pieces
greedy
1500
x1293
327C
Magic Five
combinatorics
,
math
1700
x3183
325A
Square and Rectangles
implementation
1500
x2146
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x729
322B
Ciel and Flowers
combinatorics
,
math
1600
x11678
321A
Ciel and Robot
binary search
,
implementation
,
math
1700
x3592
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7158
319A
Malek Dance Club
combinatorics
,
math
1600
x2780
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7460
317A
Perfect Pair
brute force
1600
x4622
316G1
Good Substrings
hashing
,
strings
1700
x946
316E1
Summer Homework
brute force
,
data structures
1500
x1468
316B2
EKG
dfs and similar
,
dp
1600
x1575
316B1
EKG
brute force
,
dfs and similar
1500
x1366
316A2
Special Task
math
1400
x2124
315A
Sereja and Bottles
brute force
1400
x10971
314A
Sereja and Contest
implementation
1600
x2066
313C
Ilya and Matrix
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x5588
312B
Archer
math
,
probabilities
1300
x11362
311A
The Closest Pair
constructive algorithms
,
implementation
1300
x4018
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2433
305B
Continued Fractions
brute force
,
implementation
,
math
1700
x2048
305A
Strange Addition
brute force
,
constructive algorithms
,
implementation
1600
x4708
304B
Calendar
brute force
,
implementation
1300
x2956
303B
Rectangle Puzzle II
implementation
,
math
1700
x1339
303A
Lucky Permutation Triple
constructive algorithms
,
implementation
,
math
1300
x7836
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6224
298A
Snow Footprints
greedy
,
implementation
1300
x10777
297B
Fish Weight
constructive algorithms
,
greedy
1600
x3465
297A
Parity Game
constructive algorithms
1700
x3611
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13716
295A
Greg and Array
data structures
,
implementation
1400
x17156
294B
Shaass and Bookshelf
dp
,
greedy
1700
x4487
293A
Weird Game
games
,
greedy
1500
x2855
291D
Parallel Programming
*special problem
,
greedy
1600
x1472
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1671
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3024
290D
Orange
*special problem
,
implementation
1400
x1792
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1532
290B
QR code
*special problem
,
implementation
1500
x2423
290A
Mysterious strings
*special problem
,
implementation
1400
x2982
289B
Polo the Penguin and Matrix
brute force
,
dp
,
implementation
,
sortings
,
ternary search
1400
x17092
288C
Polo the Penguin and XOR operation
implementation
,
math
1700
x2272
288B
Polo the Penguin and Houses
combinatorics
1500
x2896
288A
Polo the Penguin and Strings
greedy
1300
x6468
287B
Pipeline
binary search
,
math
1700
x9413
286A
Lucky Permutation
constructive algorithms
,
math
1400
x3145
284A
Cows and Primitive Roots
implementation
,
math
,
number theory
1400
x6520
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3636
283A
Cows and Sequence
constructive algorithms
,
data structures
,
implementation
1600
x6531
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