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Codeforces Round (Div. 2)
3 days
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constructive algorithms
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
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6912
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2612
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9135
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2256
241G
Challenging Balloons
constructive algorithms
1900
x541
238B
Boring Partition
constructive algorithms
1800
x1279
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2020
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x558
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1463
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x283
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2475
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3573
226D
The table
constructive algorithms
,
greedy
2100
x953
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11309
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x9628
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9090
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4920
213D
Stars
constructive algorithms
,
geometry
2300
x335
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x706
209B
Pixels
constructive algorithms
,
math
2100
x363
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2977
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25628
198D
Cube Snake
constructive algorithms
2700
x105
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6110
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x798
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x503
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3879
183A
Headquarters
constructive algorithms
,
math
1700
x535
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2475
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x469
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x247
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4397
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1931
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2199
148C
Terse princess
constructive algorithms
,
greedy
1700
x3079
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x89088
145B
Lucky Number 2
constructive algorithms
1800
x2166
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2148
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x915
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2405
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1325
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x462
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x608
128D
Numbers
constructive algorithms
,
implementation
2000
x1094
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2481
126C
E-reader Display
constructive algorithms
,
greedy
2000
x713
125D
Two progressions
constructive algorithms
,
greedy
2200
x394
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x908
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1070
118B
Present from Lena
constructive algorithms
,
implementation
1000
x29051
110B
Lucky String
constructive algorithms
,
strings
1100
x10052
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x634
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x939
98D
Help Monks
constructive algorithms
2500
x181
97B
Superset
constructive algorithms
,
divide and conquer
2300
x809
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x264
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x402
85A
Domino
constructive algorithms
,
implementation
1300
x1770
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2020
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x640
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12979
74E
Shift It!
constructive algorithms
2800
x148
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3088
63D
Dividing Island
constructive algorithms
1900
x1236
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x609
53C
Little Frog
constructive algorithms
1200
x6340
49C
Disposition
constructive algorithms
,
math
1700
x1660
48H
Black and White
constructive algorithms
2800
x137
45J
Planting Trees
constructive algorithms
1800
x923
45E
Director
constructive algorithms
,
greedy
2000
x530
44J
Triminoes
constructive algorithms
,
greedy
2000
x558
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1067
42D
Strange town
constructive algorithms
,
math
2300
x390
42C
Safe cracking
brute force
,
constructive algorithms
2200
x458
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1915
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3933
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x500
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x688
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2364
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2725
26E
Multithreading
constructive algorithms
2400
x368
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x830
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1373
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3246
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3277
12E
Start of the session
constructive algorithms
2100
x1174
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12839
10E
Greedy Change
constructive algorithms
2600
x812
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4263
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x7077
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x13139
4B
Before an Exam
constructive algorithms
,
greedy
1200
x24114
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