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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 174 (Rated for Div. 2)
25:07:00
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Difficulty:
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combinatorics
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
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x23082
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1910
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x388
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x7183
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x776
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x927
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3142
489F
Special Matrices
combinatorics
,
dp
2100
x1704
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6744
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x544
479E
Riding in a Lift
combinatorics
,
dp
1900
x5228
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x37560
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x31976
466D
Increase Sequence
combinatorics
,
dp
2100
x3318
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6232
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x41761
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x283
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1658
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3815
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4723
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1604
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1933
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2450
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2251
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x23575
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x1065
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1130
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4261
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x439
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1526
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x603
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x3284
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x388
380D
Sereja and Cinema
combinatorics
,
math
2500
x480
374B
Inna and Nine
combinatorics
,
greedy
1500
x3345
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x179
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1176
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4751
360C
Levko and Strings
combinatorics
,
dp
2500
x1126
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1283
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2316
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2423
340E
Iahub and Permutations
combinatorics
,
math
2000
x2522
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4310
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x117
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x1052
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1436
327C
Magic Five
combinatorics
,
math
1700
x3273
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x843
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x800
322B
Ciel and Flowers
combinatorics
,
math
1600
x12018
319A
Malek Dance Club
combinatorics
,
math
1600
x2855
306C
White, Black and White Again
combinatorics
,
number theory
2100
x508
305D
Olya and Graph
combinatorics
,
math
2200
x516
300C
Beautiful Numbers
brute force
,
combinatorics
1800
x9949
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2362
295D
Greg and Caves
combinatorics
,
dp
2400
x673
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1780
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3920
293B
Distinct Paths
brute force
,
combinatorics
2700
x886
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x762
288B
Polo the Penguin and Houses
combinatorics
1500
x2971
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x1031
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1570
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x783
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1234
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2648
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1808
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1458
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x18332
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x794
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1495
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x475
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1654
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1608
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x253
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x584
213B
Numbers
combinatorics
,
dp
1900
x1801
212C
Cowboys
combinatorics
,
dp
,
math
2100
x401
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5922
201E
Thoroughly Bureaucratic Organization
binary search
,
combinatorics
2600
x433
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x490
171B
Star
*special problem
,
combinatorics
1300
x4123
156D
Clues
combinatorics
,
graphs
2500
x1651
156C
Cipher
combinatorics
,
dp
2000
x2452
152C
Pocket Book
combinatorics
1400
x10855
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4404
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x252
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1938
140E
New Year Garland
combinatorics
,
dp
2600
x966
135E
Weak Subsequence
combinatorics
3000
x314
131C
The World is a Theatre
combinatorics
,
math
1400
x11518
128C
Games with Rectangle
combinatorics
,
dp
2000
x3010
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x4095
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x624
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1298
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x123
111D
Petya and Coloring
combinatorics
,
dp
2300
x802
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3615
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x910
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