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Contest is running
Codeforces Round 942 (Div. 1)
02:29:59
*has extra registration
Contest is running
Codeforces Round 942 (Div. 2)
02:30:00
*has extra registration
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number theory
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2-sat
binary search
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chinese remainder theorem
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dfs and similar
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Problems
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Name
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2194
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1446
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3175
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3795
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1787
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20776
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9626
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2514
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3966
396B
On Sum of Fractions
math
,
number theory
x1033
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1460
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9367
375A
Divisible by Seven
math
,
number theory
1600
x4652
371B
Fox Dividing Cheese
math
,
number theory
1300
x10894
364C
Beautiful Set
brute force
,
number theory
2300
x582
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x7877
360D
Levko and Sets
number theory
2600
x384
359C
Prime Number
math
,
number theory
1900
x2933
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2969
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4715
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2040
346E
Doodle Jump
math
,
number theory
3000
x249
346A
Alice and Bob
games
,
math
,
number theory
1600
x8444
343A
Rational Resistance
math
,
number theory
1600
x8503
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1091
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1003
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4766
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9079
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x932
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2367
313A
Ilya and Bank Account
implementation
,
number theory
900
x53468
306C
White, Black and White Again
combinatorics
,
number theory
2100
x435
303D
Rotatable Number
math
,
number theory
2600
x278
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x852
300E
Empire Strikes Back
binary search
,
math
,
number theory
2300
x1024
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x7731
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x299
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3712
293C
Cube Problem
brute force
,
math
,
number theory
2400
x551
284A
Cows and Primitive Roots
implementation
,
math
,
number theory
1400
x6366
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x520
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1410
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x478
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12346
267A
Subtractions
math
,
number theory
900
x7125
264B
Good Sequences
dp
,
number theory
1500
x9602
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1011
248B
Chilly Willy
math
,
number theory
1400
x5187
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5545
236B
Easy Number Challenge
implementation
,
number theory
1300
x13444
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x741
235A
LCM Challenge
number theory
1600
x16782
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x69677
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
225E
Unsolvable
math
,
number theory
2100
x777
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3098
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1510
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2079
216E
Martian Luck
math
,
number theory
2000
x543
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x538
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x333
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25019
185D
Visit of the Great
math
,
number theory
2600
x378
180B
Divisibility Rules
math
,
number theory
2300
x326
177B2
Rectangular Game
number theory
1200
x2826
177B1
Rectangular Game
number theory
1000
x3989
172D
Calendar Reform
*special problem
,
number theory
1500
x1381
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2685
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1244
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6170
154B
Colliders
math
,
number theory
1600
x4229
150A
Win or Freeze
games
,
math
,
number theory
1400
x7563
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1906
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3512
122A
Lucky Division
brute force
,
number theory
1000
x115721
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1266
117B
Very Interesting Game
brute force
,
number theory
1800
x1535
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1201
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3536
93E
Lostborn
dp
,
math
,
number theory
2600
x433
84A
Toy Army
math
,
number theory
900
x14548
83D
Numbers
dp
,
math
,
number theory
2400
x817
78C
Beaver Game
dp
,
games
,
number theory
2000
x1799
75C
Modified GCD
binary search
,
number theory
1600
x11966
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x949
73E
Morrowindows
math
,
number theory
2400
x322
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6219
68A
Irrational problem
implementation
,
number theory
1100
x4800
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3044
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x234
59B
Fortune Telling
implementation
,
number theory
1200
x6640
55D
Beautiful numbers
dp
,
number theory
2500
x3594
45G
Prime Problem
number theory
2200
x994
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3985
26A
Almost Prime
number theory
900
x28452
17D
Notepad
number theory
2400
x1029
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15009
16C
Monitor
binary search
,
number theory
1800
x4491
10C
Digital Root
number theory
2000
x1390
7C
Line
math
,
number theory
1800
x4229
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