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Codeforces Round 946 (Div. 3)
3 days
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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
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x669
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x669
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x665
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x662
188D
Asterisks
*special problem
,
implementation
1100
x656
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x653
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x653
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x650
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x645
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x643
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x637
1532C
Uniform String
*special problem
,
implementation
x635
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x632
1219G
Harvester
implementation
2000
x631
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x629
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x623
1575K
Knitting Batik
implementation
,
math
2200
x621
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x616
883C
Downloading B++
binary search
,
implementation
2300
x614
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x611
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x609
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x603
71D
Solitaire
brute force
,
implementation
2200
x600
11C
How Many Squares?
implementation
2200
x589
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x588
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x583
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x583
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x581
484C
Strange Sorting
implementation
,
math
2600
x580
883A
Automatic Door
implementation
2200
x574
633H
Fibonacci-ish II
data structures
,
implementation
3100
x570
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x563
34E
Collisions
brute force
,
implementation
,
math
2000
x563
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x562
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x561
69C
Game
implementation
2000
x558
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x557
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x555
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x553
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x548
1663E
Are You Safe?
*special problem
,
implementation
x541
100B
Friendly Numbers
*special problem
,
implementation
1500
x534
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x533
380B
Sereja and Tree
graphs
,
implementation
2400
x530
1812G
Colour Vision
*special problem
,
implementation
x528
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x524
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x522
180A
Defragmentation
implementation
1800
x522
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x520
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x520
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x520
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x516
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x515
1303F
Number of Components
dsu
,
implementation
2800
x515
100C
A+B
*special problem
,
implementation
1400
x515
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x511
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x510
241C
Mirror Box
geometry
,
implementation
2000
x507
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x505
858E
Tests Renumeration
greedy
,
implementation
2200
x497
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x497
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x496
188E
HQ9+
*special problem
,
implementation
1400
x490
1310B
Double Elimination
dp
,
implementation
2500
x488
254E
Dormitory
dp
,
implementation
2100
x484
215C
Crosses
brute force
,
implementation
2100
x480
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x479
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x479
70E
Information Reform
dp
,
implementation
,
trees
2700
x478
38D
Vasya the Architect
implementation
1900
x478
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x477
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x474
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x471
132B
Piet
implementation
2100
x471
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x470
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x470
1533C
Sweets
*special problem
,
data structures
,
implementation
x467
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x458
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x457
72I
Goofy Numbers
*special problem
,
implementation
1500
x456
611F
New Year and Cleaning
binary search
,
implementation
2500
x454
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x449
277C
Game
games
,
implementation
2400
x447
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x438
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x436
188C
LCM
*special problem
,
implementation
,
math
1400
x434
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x430
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x427
784D
Touchy-Feely Palindromes
*special problem
,
implementation
1900
x425
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x423
51D
Geometrical problem
implementation
2200
x418
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x417
1170D
Decoding of Integer Sequences
*special problem
,
data structures
,
implementation
x417
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x415
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x414
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x413
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x412
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x410
93C
Azembler
brute force
,
implementation
2500
x410
1297B
Cartoons
*special problem
,
implementation
,
sortings
x409
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