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Before contest
Codeforces Round 950 (Div. 3)
36:35:34
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Difficulty:
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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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Problems
#
Name
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2458
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3562
226D
The table
constructive algorithms
,
greedy
2100
x948
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11176
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x9484
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x8961
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4898
213D
Stars
constructive algorithms
,
geometry
2300
x335
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x703
209B
Pixels
constructive algorithms
,
math
2100
x360
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2972
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25291
198D
Cube Snake
constructive algorithms
2700
x105
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6055
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x741
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x498
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3858
183A
Headquarters
constructive algorithms
,
math
1700
x529
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2461
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x466
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x247
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4367
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1925
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2192
148C
Terse princess
constructive algorithms
,
greedy
1700
x3071
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x87882
145B
Lucky Number 2
constructive algorithms
1800
x2154
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2140
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x867
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2374
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1324
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x460
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x605
128D
Numbers
constructive algorithms
,
implementation
2000
x1090
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2473
126C
E-reader Display
constructive algorithms
,
greedy
2000
x712
125D
Two progressions
constructive algorithms
,
greedy
2200
x393
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x907
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1068
118B
Present from Lena
constructive algorithms
,
implementation
1000
x28612
110B
Lucky String
constructive algorithms
,
strings
1100
x9981
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x617
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x938
98D
Help Monks
constructive algorithms
2500
x180
97B
Superset
constructive algorithms
,
divide and conquer
2300
x805
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x262
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x402
85A
Domino
constructive algorithms
,
implementation
1300
x1765
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2019
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x634
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12812
74E
Shift It!
constructive algorithms
2800
x143
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3063
63D
Dividing Island
constructive algorithms
1900
x1227
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x606
53C
Little Frog
constructive algorithms
1200
x6236
49C
Disposition
constructive algorithms
,
math
1700
x1649
48H
Black and White
constructive algorithms
2800
x135
45J
Planting Trees
constructive algorithms
1800
x915
45E
Director
constructive algorithms
,
greedy
2000
x526
44J
Triminoes
constructive algorithms
,
greedy
2000
x556
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1051
42D
Strange town
constructive algorithms
,
math
2300
x390
42C
Safe cracking
brute force
,
constructive algorithms
2200
x453
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1906
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3873
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x499
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x679
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2335
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2700
26E
Multithreading
constructive algorithms
2400
x367
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x825
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1363
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3209
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3126
12E
Start of the session
constructive algorithms
2100
x1169
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12544
10E
Greedy Change
constructive algorithms
2600
x808
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4094
7A
Kalevitch and Chess
brute force
,
constructive algorithms
1100
x6886
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x12795
4B
Before an Exam
constructive algorithms
,
greedy
1200
x23838
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