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Educational Codeforces Round 165 (Rated for Div. 2)
34:55:52
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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
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x623
1575K
Knitting Batik
implementation
,
math
2200
x620
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x615
883C
Downloading B++
binary search
,
implementation
2300
x614
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x609
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x609
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x607
1219G
Harvester
implementation
2000
x601
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x600
71D
Solitaire
brute force
,
implementation
2200
x598
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x589
11C
How Many Squares?
implementation
2200
x587
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x581
484C
Strange Sorting
implementation
,
math
2600
x580
883A
Automatic Door
implementation
2200
x573
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x571
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x568
633H
Fibonacci-ish II
data structures
,
implementation
3100
x564
34E
Collisions
brute force
,
implementation
,
math
2000
x563
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x561
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x560
69C
Game
implementation
2000
x557
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x556
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x556
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x555
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x552
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x547
1663E
Are You Safe?
*special problem
,
implementation
x538
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x534
100B
Friendly Numbers
*special problem
,
implementation
1500
x534
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x532
380B
Sereja and Tree
graphs
,
implementation
2400
x527
180A
Defragmentation
implementation
1800
x522
1812G
Colour Vision
*special problem
,
implementation
x521
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x520
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x519
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x516
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x515
100C
A+B
*special problem
,
implementation
1400
x514
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x512
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x511
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x511
1303F
Number of Components
dsu
,
implementation
2800
x510
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x510
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x508
241C
Mirror Box
geometry
,
implementation
2000
x507
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x503
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x497
858E
Tests Renumeration
greedy
,
implementation
2200
x495
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x494
188E
HQ9+
*special problem
,
implementation
1400
x489
1310B
Double Elimination
dp
,
implementation
2500
x488
254E
Dormitory
dp
,
implementation
2100
x484
215C
Crosses
brute force
,
implementation
2100
x480
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x477
70E
Information Reform
dp
,
implementation
,
trees
2700
x476
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x475
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x474
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x474
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x470
132B
Piet
implementation
2100
x470
38D
Vasya the Architect
implementation
1900
x470
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x469
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x461
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x457
1533C
Sweets
*special problem
,
data structures
,
implementation
x456
611F
New Year and Cleaning
binary search
,
implementation
2500
x454
72I
Goofy Numbers
*special problem
,
implementation
1500
x454
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x453
277C
Game
games
,
implementation
2400
x446
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x445
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x437
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x436
188C
LCM
*special problem
,
implementation
,
math
1400
x434
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x427
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x423
784D
Touchy-Feely Palindromes
*special problem
,
implementation
1900
x423
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x417
51D
Geometrical problem
implementation
2200
x417
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x414
1170D
Decoding of Integer Sequences
*special problem
,
data structures
,
implementation
x413
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x411
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x411
93C
Azembler
brute force
,
implementation
2500
x410
1297B
Cartoons
*special problem
,
implementation
,
sortings
x407
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x406
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x405
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x404
761F
Dasha and Photos
brute force
,
data structures
,
dp
,
implementation
2600
x401
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x397
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x396
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x393
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x389
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x386
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x384
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x384
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x371
43E
Race
brute force
,
implementation
,
two pointers
2300
x370
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x368
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