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Before contest
Codeforces Round 970 (Div. 3)
08:04:42
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Difficulty:
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dp
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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Problems
#
Name
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6636
213C
Relay Race
dp
2000
x2820
213B
Numbers
combinatorics
,
dp
1900
x1684
209A
Multicolored Marbles
dp
,
math
1600
x2323
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1832
208B
Solitaire
dfs and similar
,
dp
1900
x1354
201C
Fragile Bridges
dp
2000
x1330
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2992
187B
AlgoRace
dp
,
shortest paths
1800
x1952
182E
Wooden Fence
dp
1800
x1447
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1752
176B
Word Cut
dp
1700
x1786
173C
Spiral Maximum
brute force
,
dp
1900
x972
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2137
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12154
163A
Substring and Subsequence
dp
1700
x2686
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x14548
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1458
156C
Cipher
combinatorics
,
dp
2000
x2377
149D
Coloring Brackets
dp
1900
x3765
148E
Porcelain
dp
1900
x3979
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7111
137D
Palindromes
dp
,
strings
1900
x1503
132C
Logo Turtle
dp
1800
x2306
128C
Games with Rectangle
combinatorics
,
dp
2000
x2888
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19078
119C
Education Reform
dp
2000
x882
118D
Caesar's Legions
dp
1700
x17253
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3484
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3420
106C
Buns
dp
1700
x5905
101B
Buses
binary search
,
data structures
,
dp
1700
x2551
95B
Lucky Numbers
dp
,
greedy
1800
x1208
87C
Interesting Game
dp
,
games
,
math
2000
x1336
82D
Two out of Three
dp
2000
x1996
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1763
78C
Beaver Game
dp
,
games
,
number theory
2000
x1855
76D
Plus and xor
dp
,
greedy
,
math
1700
x2049
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1774
73C
LionAge II
dp
1800
x2104
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6432
69D
Dot
dp
,
games
1900
x982
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1391
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2103
66E
Petya and Post
data structures
,
dp
2000
x717
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x734
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1289
49D
Game
brute force
,
dp
,
implementation
1800
x1888
46E
Comb
data structures
,
dp
1900
x951
44H
Phone Number
dp
1700
x1721
41D
Pawn
dp
1900
x2326
39E
What Has Dirichlet Got to Do with That?
dp
,
games
2000
x869
38E
Let's Go Rolling!
dp
,
sortings
1800
x2562
35D
Animals
dp
,
greedy
1700
x3277
30C
Shooting Gallery
dp
,
probabilities
1800
x1931
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4150
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2099
19B
Checkout Assistant
dp
1900
x4692
18E
Flag 2
dp
2000
x1059
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1063
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4988
14E
Camels
dp
1900
x1677
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4459
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3834
8C
Looking for Order
bitmasks
,
dp
2000
x3505
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x13563
4D
Mysterious Present
dp
,
sortings
1700
x10192
2B
The least round way
dp
,
math
2000
x10745
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