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Before contest
Codeforces Round 941 (Div. 1)
08:27:07
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Before contest
Codeforces Round 941 (Div. 2)
08:27:07
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combine-tags-by-or
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2-sat
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bitmasks
brute force
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combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
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dsu
expression parsing
fft
flows
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graph matchings
graphs
greedy
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Problems
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Name
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x143
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x211
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x210
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x224
1381E
Origami
geometry
,
math
,
sortings
3300
x100
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x282
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x295
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x313
1558F
Strange Sort
data structures
,
sortings
3300
x349
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x514
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x296
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x97
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x113
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x177
528E
Triangles 3000
geometry
,
sortings
3100
x214
720D
Slalom
data structures
,
dp
,
sortings
3100
x222
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x319
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x326
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x441
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x526
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x225
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x258
778E
Selling Numbers
dp
,
sortings
3000
x299
773E
Blog Post Rating
data structures
,
sortings
3000
x315
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x446
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x454
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x525
559E
Gerald and Path
dp
,
sortings
3000
x854
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2044
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x102
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x204
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x265
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x411
48F
Snow sellers
greedy
,
sortings
2800
x133
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x162
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x367
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x423
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x533
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x565
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x639
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x804
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1049
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2647
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x285
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x334
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x374
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x390
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x391
1214F
Employment
greedy
,
sortings
2700
x422
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x469
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x558
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x580
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x624
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x766
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x799
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1364
140F
New Year Snowflake
geometry
,
sortings
2600
x359
286D
Tourists
data structures
,
sortings
2600
x371
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x413
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x477
173E
Camping Groups
data structures
,
sortings
2600
x534
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x718
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x727
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x807
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x835
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x904
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x923
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x925
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x945
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x967
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x985
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1080
887F
Row of Models
greedy
,
sortings
2500
x160
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x337
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x344
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x448
681E
Runaway to a Shadow
geometry
,
sortings
2500
x448
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x503
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x507
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x514
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x652
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x693
15D
Map
data structures
,
implementation
,
sortings
2500
x707
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x751
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x763
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x769
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x815
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x849
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x850
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x876
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x897
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x973
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1002
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