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Before contest
Codeforces Round 950 (Div. 3)
39:14:23
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Difficulty:
—
implementation
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
81A
Plug-in
implementation
1400
x10250
79B
Colorful Field
implementation
,
sortings
1400
x6856
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12812
78A
Haiku
implementation
,
strings
800
x12024
77D
Domino Carpet
dp
,
implementation
2300
x311
77A
Heroes
brute force
,
implementation
1400
x1750
76E
Points
implementation
,
math
1700
x1662
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1744
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3226
75A
Life Without Zeros
implementation
1000
x25127
74A
Room Leader
implementation
1000
x4951
72I
Goofy Numbers
*special problem
,
implementation
1500
x457
72H
Reverse It!
*special problem
,
implementation
1600
x260
72B
INI-file
*special problem
,
implementation
2200
x76
71D
Solitaire
brute force
,
implementation
2200
x608
71B
Progress Bar
implementation
,
math
1300
x4382
70E
Information Reform
dp
,
implementation
,
trees
2700
x481
69E
Subsegments
data structures
,
implementation
1800
x4043
69C
Game
implementation
2000
x568
69B
Bets
greedy
,
implementation
1200
x3196
69A
Young Physicist
implementation
,
math
1000
x156439
68A
Irrational problem
implementation
,
number theory
1100
x4832
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2063
66C
Petya and File System
data structures
,
implementation
1800
x1000
66B
Petya and Countryside
brute force
,
implementation
1100
x19620
66A
Petya and Java
implementation
,
strings
1300
x6236
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x86
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1322
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1786
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x332
64A
Factorial
*special problem
,
implementation
1300
x2716
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x717
63C
Bulls and Cows
brute force
,
implementation
1700
x1641
63B
Settlers' Training
implementation
1200
x4723
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10935
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x248
62B
Tyndex.Brome
binary search
,
implementation
1800
x1264
61A
Ultra-Fast Mathematician
implementation
800
x104582
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3537
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x606
59B
Fortune Telling
implementation
,
number theory
1200
x6714
59A
Word
implementation
,
strings
800
x163949
57B
Martian Architecture
implementation
1600
x989
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2820
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1123
56B
Spoilt Permutation
implementation
1300
x3631
56A
Bar
implementation
1000
x8361
55A
Flea travel
implementation
,
math
1200
x3344
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x740
54A
Presents
implementation
1300
x2011
53B
Blog Photo
binary search
,
implementation
1700
x1371
53A
Autocomplete
implementation
1100
x4859
52A
123-sequence
implementation
900
x8352
51D
Geometrical problem
implementation
2200
x419
51A
Cheaterius's Problem
implementation
1300
x1785
49D
Game
brute force
,
dp
,
implementation
1800
x1841
49A
Sleuth
implementation
800
x12975
48B
Land Lot
brute force
,
implementation
1200
x2614
48A
Rock-paper-scissors
implementation
,
schedules
900
x5721
47C
Crossword
implementation
2000
x754
47B
Coins
implementation
1200
x13148
46D
Parking Lot
data structures
,
implementation
1800
x961
46B
T-shirts from Sponsor
implementation
1100
x3549
46A
Ball Game
brute force
,
implementation
800
x8413
45A
Codecraft III
implementation
900
x6397
44G
Shooting Gallery
data structures
,
implementation
2500
x369
44C
Holidays
implementation
1300
x3221
44B
Cola
implementation
1500
x1907
44A
Indian Summer
implementation
900
x9581
43E
Race
brute force
,
implementation
,
two pointers
2300
x377
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1051
43B
Letter
implementation
,
strings
1100
x15826
42B
Game of chess unfinished
implementation
1700
x924
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2766
41C
Email address
expression parsing
,
implementation
1300
x3655
41A
Translation
implementation
,
strings
800
x136428
40C
Berland Square
implementation
,
math
2300
x243
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3873
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2838
39H
Multiplication Table
implementation
1300
x2619
39G
Inverse Function
implementation
2400
x125
39F
Pacifist frogs
implementation
1300
x1502
38D
Vasya the Architect
implementation
1900
x479
38B
Chess
brute force
,
implementation
,
math
1200
x3423
38A
Army
implementation
800
x20617
37B
Computer Game
greedy
,
implementation
1800
x870
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x499
36C
Bowls
geometry
,
implementation
2200
x330
36B
Fractal
implementation
1600
x1431
36A
Extra-terrestrial Intelligence
implementation
1300
x2906
35B
Warehouse
implementation
1700
x993
35A
Shell Game
implementation
1000
x6639
34E
Collisions
brute force
,
implementation
,
math
2000
x564
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4085
34A
Reconnaissance 2
implementation
800
x28659
33A
What is for dinner?
greedy
,
implementation
1200
x3882
32E
Hide-and-Seek
geometry
,
implementation
2400
x324
32D
Constellation
implementation
1600
x1242
32B
Borze
expression parsing
,
implementation
800
x59457
31D
Chocolate
dfs and similar
,
implementation
2000
x1000
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