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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
38:16:16
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Difficulty:
—
dp
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
768D
Jon and Orbs
dp
,
math
,
probabilities
2200
x2754
1860D
Balanced String
dp
2200
x2771
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2778
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2788
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2825
1215E
Marbles
bitmasks
,
dp
2200
x2909
1353F
Decreasing Heights
brute force
,
dp
2200
x3052
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3180
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3195
1110D
Jongmah
dp
2200
x3257
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3319
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3319
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3327
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3351
1467D
Sum of Paths
combinatorics
,
dp
,
math
2200
x3538
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3640
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x3868
13C
Sequence
dp
,
sortings
2200
x4084
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4423
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4480
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4617
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5001
628D
Magic Numbers
dp
2200
x5345
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6130
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6166
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x137
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x167
38F
Smart Boy
dp
,
games
,
strings
2100
x374
212C
Cowboys
combinatorics
,
dp
,
math
2100
x376
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x411
254E
Dormitory
dp
,
implementation
2100
x484
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x487
690D3
The Wall (hard)
dp
2100
x489
309B
Context Advertising
dp
,
two pointers
2100
x498
54D
Writing a Song
brute force
,
dp
,
strings
2100
x503
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x538
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x560
39C
Moon Craters
dp
,
sortings
2100
x568
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x578
50D
Bombing
binary search
,
dp
,
probabilities
2100
x596
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x603
1906J
Count BFS Graph
combinatorics
,
dp
2100
x624
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x670
542F
Quest
dp
,
greedy
2100
x734
852E
Casinos and travel
dp
2100
x808
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x848
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x975
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x977
575F
Bulbo
dp
,
greedy
2100
x983
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1018
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1027
1044C
Optimal Polygon Perimeter
dp
,
geometry
2100
x1202
1163D
Mysterious Code
dp
,
strings
2100
x1210
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1224
283C
Coin Troubles
dp
2100
x1230
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1264
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1291
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1308
282D
Yet Another Number Game
dp
,
games
2100
x1375
587B
Duff in Beach
dp
2100
x1376
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1408
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1411
313D
Ilya and Roads
dp
2100
x1415
1032E
The Unbearable Lightness of Weights
dp
,
math
2100
x1472
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1474
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1498
56D
Changing a String
dp
2100
x1509
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1536
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1574
489F
Special Matrices
combinatorics
,
dp
2100
x1595
464C
Substitutes in Number
dp
2100
x1650
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1654
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1656
1176F
Destroy it!
dp
,
implementation
,
sortings
2100
x1736
1066F
Yet another 2D Walking
dp
2100
x1759
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1779
1510D
Digits
dp
,
math
,
number theory
2100
x1794
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x1858
1120C
Compress String
dp
,
strings
2100
x1870
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1881
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1901
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1961
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x1969
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2033
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2052
229D
Towers
dp
,
greedy
,
two pointers
2100
x2099
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2103
894E
Ralph and Mushrooms
dp
,
graphs
2100
x2136
1201D
Treasure Hunting
binary search
,
dp
,
greedy
,
implementation
2100
x2149
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2163
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2167
988F
Rain and Umbrellas
dp
2100
x2192
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2230
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2233
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2239
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2253
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2263
1106E
Lunar New Year and Red Envelopes
data structures
,
dp
2100
x2314
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2323
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2330
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