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Codeforces Global Round 26
3 days
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math
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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Custom test
Problems
#
Name
76E
Points
implementation
,
math
1700
x1665
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
x1746
73E
Morrowindows
math
,
number theory
2400
x324
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1301
72F
Oil
*special problem
,
greedy
,
math
1900
x117
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x906
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x182
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6263
71B
Progress Bar
implementation
,
math
1300
x4389
70A
Cookies
math
1300
x3228
69A
Young Physicist
implementation
,
math
1000
x156740
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x451
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3066
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1787
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x236
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x332
62A
A Student's Dream
greedy
,
math
1300
x3382
61C
Capture Valerian
math
2000
x695
60E
Mushroom Gnomes
math
,
matrices
2600
x317
60D
Savior
brute force
,
dsu
,
math
2500
x398
57E
Chess
math
,
shortest paths
3000
x251
57D
Journey
dp
,
math
2500
x331
57C
Array
combinatorics
,
math
1900
x2361
55A
Flea travel
implementation
,
math
1200
x3345
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1253
50E
Square Equation Roots
math
2300
x347
50A
Domino piling
greedy
,
math
800
x231575
49C
Disposition
constructive algorithms
,
math
1700
x1651
49B
Sum
math
1500
x2402
48C
The Race
math
1800
x759
47A
Triangular numbers
brute force
,
math
800
x14417
44D
Hyperdrive
math
1800
x694
42D
Strange town
constructive algorithms
,
math
2300
x390
40D
Interesting Sequence
math
2600
x128
40C
Berland Square
implementation
,
math
2300
x243
40B
Repaintings
math
1600
x1120
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3874
39D
Cubical Planet
math
1100
x3773
38B
Chess
brute force
,
implementation
,
math
1200
x3425
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x390
34E
Collisions
brute force
,
implementation
,
math
2000
x566
32C
Flea
math
1700
x2070
30A
Accounting
brute force
,
math
1400
x3340
28E
DravDe saves the world
geometry
,
math
2800
x87
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x763
24D
Broken robot
dp
,
math
,
probabilities
2400
x1810
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1220
23D
Tetragon
geometry
,
math
2600
x327
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3212
21B
Intersection
implementation
,
math
2000
x1308
20B
Equation
math
2000
x3682
18B
Platforms
brute force
,
math
1700
x2073
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15287
15B
Laser
math
1800
x1306
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3131
13A
Numbers
implementation
,
math
1000
x7402
11B
Jumping Jack
math
1600
x4370
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12556
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12471
9A
Die Roll
math
,
probabilities
800
x53270
7C
Line
math
,
number theory
1800
x4323
5D
Follow Traffic Rules
implementation
,
math
2100
x1590
4A
Watermelon
brute force
,
math
800
x488065
2B
The least round way
dp
,
math
2000
x10407
1C
Ancient Berland Circus
geometry
,
math
2100
x5513
1B
Spreadsheet
implementation
,
math
1600
x21844
1A
Theatre Square
math
1000
x248389
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