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Before contest
Codeforces Round 952 (Div. 4)
13:22:15
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Difficulty:
—
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
180C
Letter
dp
1400
x7131
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x317
176D
Hyper String
dp
2500
x305
176B
Word Cut
dp
1700
x1725
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x261
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x294
174B
File List
dp
,
greedy
,
implementation
1400
x2200
173C
Spiral Maximum
brute force
,
dp
1900
x966
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2101
166E
Tetrahedron
dp
,
math
,
matrices
1500
x20188
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x347
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6311
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11936
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1540
163A
Substring and Subsequence
dp
1700
x2627
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x463
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13798
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4260
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1452
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x161
156C
Cipher
combinatorics
,
dp
2000
x2303
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x464
150D
Mission Impassable
dp
,
strings
2600
x589
149D
Coloring Brackets
dp
1900
x3603
148E
Porcelain
dp
1900
x3818
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6849
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1890
142C
Help Caretaker
brute force
,
dp
2300
x903
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x867
140E
New Year Garland
combinatorics
,
dp
2600
x875
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x168
138D
World of Darkraft
dp
,
games
2500
x474
137D
Palindromes
dp
,
strings
1900
x1481
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x606
132C
Logo Turtle
dp
1800
x2280
128C
Games with Rectangle
combinatorics
,
dp
2000
x2717
126D
Fibonacci Sums
dp
,
math
2300
x808
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x18105
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x694
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x590
120F
Spiders
dp
,
greedy
,
trees
1400
x3520
119C
Education Reform
dp
2000
x870
118D
Caesar's Legions
dp
1700
x16846
115E
Linear Kingdom Races
data structures
,
dp
2400
x1389
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x376
111D
Petya and Coloring
combinatorics
,
dp
2300
x720
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1297
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3207
107D
Crime Management
dp
,
graphs
,
matrices
2400
x401
107C
Arrangement
bitmasks
,
dp
2400
x363
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3306
106C
Buns
dp
1700
x5754
101E
Candies and Stones
divide and conquer
,
dp
2500
x478
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x672
101B
Buses
binary search
,
data structures
,
dp
1700
x2508
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x457
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1404
95D
Horse Races
dp
,
math
2500
x418
95B
Lucky Numbers
dp
,
greedy
1800
x1182
93E
Lostborn
dp
,
math
,
number theory
2600
x436
93D
Flags
dp
,
math
,
matrices
2500
x336
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x511
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x853
87C
Interesting Game
dp
,
games
,
math
2000
x1312
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x688
83E
Two Subsequences
bitmasks
,
dp
2800
x459
83D
Numbers
dp
,
math
,
number theory
2400
x827
82D
Two out of Three
dp
2000
x1932
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x329
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x961
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1734
78C
Beaver Game
dp
,
games
,
number theory
2000
x1811
77D
Domino Carpet
dp
,
implementation
2300
x312
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x981
76F
Tourist
binary search
,
data structures
,
dp
2300
x609
76D
Plus and xor
dp
,
greedy
,
math
1700
x2006
76C
Mutation
bitmasks
,
dp
,
math
2700
x272
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1749
74B
Train
dp
,
games
,
greedy
1500
x1499
73C
LionAge II
dp
1800
x2065
72G
Fibonacci army
*special problem
,
dp
1000
x2059
71E
Nuclear Fusion
bitmasks
,
dp
2200
x680
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6265
70E
Information Reform
dp
,
implementation
,
trees
2700
x481
69D
Dot
dp
,
games
1900
x942
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x452
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1347
67C
Sequence of Balls
dp
2600
x631
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2065
66E
Petya and Post
data structures
,
dp
2000
x687
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x717
62E
World Evil
dp
,
flows
2700
x226
58E
Expression
dp
2400
x349
57D
Journey
dp
,
math
2500
x333
56D
Changing a String
dp
2100
x1544
55D
Beautiful numbers
dp
,
number theory
2500
x3629
54D
Writing a Song
brute force
,
dp
,
strings
2100
x516
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1253
53E
Dead Ends
bitmasks
,
dp
2500
x915
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x551
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