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Before contest
Codeforces Round (Div. 2)
3 days
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*has extra registration
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Difficulty:
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number theory
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
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interactive
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matrices
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number theory
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Custom test
Problems
#
Name
78C
Beaver Game
dp
,
games
,
number theory
2000
x1824
75C
Modified GCD
binary search
,
number theory
1600
x12254
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x1052
73E
Morrowindows
math
,
number theory
2400
x325
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6299
68A
Irrational problem
implementation
,
number theory
1100
x4856
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3088
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x236
59B
Fortune Telling
implementation
,
number theory
1200
x6760
55D
Beautiful numbers
dp
,
number theory
2500
x3705
45G
Prime Problem
number theory
2200
x1004
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4049
26A
Almost Prime
number theory
900
x29543
17D
Notepad
number theory
2400
x1046
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15531
16C
Monitor
binary search
,
number theory
1800
x4615
10C
Digital Root
number theory
2000
x1414
7C
Line
math
,
number theory
1800
x4454
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