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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
17:09:05
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Difficulty:
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math
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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Status
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Custom test
Problems
#
Name
401A
Vanya and Cards
implementation
,
math
800
x16327
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2902
397B
On Corruption and Numbers
constructive algorithms
,
implementation
,
math
x754
396E
On Iteration of One Well-Known Function
math
x154
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x438
396B
On Sum of Fractions
math
,
number theory
x1079
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1517
394D
Physical Education and Buns
brute force
,
implementation
,
math
x271
394B
Very Beautiful Number
math
x575
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x594
392A
Blocked Points
math
x976
389A
Fox and Number Game
greedy
,
math
1000
x14104
388D
Fox and Perfect Sets
math
2700
x446
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2482
385E
Bear in the Field
math
,
matrices
2300
x590
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9715
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9981
382B
Number Busters
binary search
,
math
2000
x1412
380D
Sereja and Cinema
combinatorics
,
math
2500
x468
376A
Lever
implementation
,
math
900
x9368
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x412
375A
Divisible by Seven
math
,
number theory
1600
x4863
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2487
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x4179
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1309
371B
Fox Dividing Cheese
math
,
number theory
1300
x11472
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x6129
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x10386
369B
Valera and Contest
constructive algorithms
,
implementation
,
math
1400
x6525
366E
Dima and Magic Guitar
brute force
,
implementation
,
math
2200
x772
364D
Ghd
brute force
,
math
,
probabilities
2900
x2112
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1789
362A
Two Semiknights Meet
greedy
,
math
1500
x2678
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x8092
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x5141
359C
Prime Number
math
,
number theory
1900
x3148
359B
Permutation
constructive algorithms
,
dp
,
math
1400
x8071
356B
Xenia and Hamming
implementation
,
math
1900
x1934
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5487
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4916
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2291
353A
Domino
implementation
,
math
1200
x18606
352A
Jeff and Digits
brute force
,
implementation
,
math
1000
x25850
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2928
348A
Mafia
binary search
,
math
,
sortings
1600
x13236
347B
Fixed Points
brute force
,
implementation
,
math
1100
x9340
346E
Doodle Jump
math
,
number theory
3000
x265
346C
Number Transformation II
greedy
,
math
2200
x1437
346A
Alice and Bob
games
,
math
,
number theory
1600
x8718
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8891
343A
Rational Resistance
math
,
number theory
1600
x8780
340E
Iahub and Permutations
combinatorics
,
math
2000
x2486
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4242
340A
The Wall
math
1200
x7688
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1171
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4908
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9393
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x1013
336B
Vasily the Bear and Fly
math
1900
x1218
336A
Vasily the Bear and Triangle
implementation
,
math
1000
x10131
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x225
332D
Theft of Blueprints
graphs
,
math
2400
x385
329E
Evil
math
3100
x169
327C
Magic Five
combinatorics
,
math
1700
x3228
327B
Hungry Sequence
math
1200
x19856
325B
Stadium and Games
binary search
,
math
1800
x1568
322B
Ciel and Flowers
combinatorics
,
math
1600
x11872
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x547
321A
Ciel and Robot
binary search
,
implementation
,
math
1700
x3650
319A
Malek Dance Club
combinatorics
,
math
1600
x2804
318A
Even Odds
math
900
x115918
316E3
Summer Homework
data structures
,
math
2300
x533
316E2
Summer Homework
data structures
,
math
2300
x400
316D3
PE Lesson
dp
,
math
2400
x601
316A2
Special Task
math
1400
x2150
312B
Archer
math
,
probabilities
1300
x11696
311D
Interval Cubing
data structures
,
math
2600
x673
309A
Morning run
binary search
,
math
,
two pointers
2000
x488
305D
Olya and Graph
combinatorics
,
math
2200
x512
305B
Continued Fractions
brute force
,
implementation
,
math
1700
x2152
304A
Pythagorean Theorem II
brute force
,
math
1200
x10712
303E
Random Ranking
dp
,
math
,
probabilities
3000
x321
303D
Rotatable Number
math
,
number theory
2600
x298
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x892
303B
Rectangle Puzzle II
implementation
,
math
1700
x1347
303A
Lucky Permutation Triple
constructive algorithms
,
implementation
,
math
1300
x7974
300E
Empire Strikes Back
binary search
,
math
,
number theory
2300
x1047
296A
Yaroslav and Permutations
greedy
,
math
1100
x23307
294A
Shaass and Oskols
implementation
,
math
800
x23810
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x239
293C
Cube Problem
brute force
,
math
,
number theory
2400
x577
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x298
288C
Polo the Penguin and XOR operation
implementation
,
math
1700
x2307
287B
Pipeline
binary search
,
math
1700
x9895
286E
Ladies' Shop
constructive algorithms
,
fft
,
math
2800
x833
286A
Lucky Permutation
constructive algorithms
,
math
1400
x3186
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x1001
284A
Cows and Primitive Roots
implementation
,
math
,
number theory
1400
x6609
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x777
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x543
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