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Codeforces Round 940 (Div. 2) and CodeCraft-23
37:34:37
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Difficulty:
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sortings
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
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x574
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x574
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x578
1532D
Teams Forming
*special problem
,
sortings
x579
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x613
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x623
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x634
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x651
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x658
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x668
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x669
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x672
1949F
Dating
greedy
,
sortings
,
trees
x675
1662N
Drone Photo
combinatorics
,
math
,
sortings
x684
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x691
35E
Parade
data structures
,
sortings
2100
x698
15D
Map
data structures
,
implementation
,
sortings
2500
x706
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x716
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x725
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x737
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x749
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x757
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x759
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x767
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x773
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x796
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x797
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x801
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x801
949D
Curfew
binary search
,
brute force
,
greedy
,
sortings
2300
x809
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x811
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x834
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x843
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x843
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x845
847F
Berland Elections
greedy
,
sortings
2100
x847
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x848
611E
New Year and Three Musketeers
data structures
,
greedy
,
sortings
2400
x851
559E
Gerald and Path
dp
,
sortings
3000
x851
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x852
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x874
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x879
958E2
Guard Duty (medium)
binary search
,
dp
,
greedy
,
sortings
2200
x893
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x895
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x896
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x902
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x906
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x908
1906F
Maximize The Value
data structures
,
sortings
2100
x913
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x919
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x923
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x931
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x938
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x964
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x971
268E
Playlist
math
,
probabilities
,
sortings
2100
x971
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x972
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x972
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x974
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x981
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x987
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x993
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x996
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1000
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1004
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1033
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1045
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1055
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1060
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1065
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1076
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x1093
558D
Guess Your Way Out! II
data structures
,
implementation
,
sortings
2300
x1102
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1127
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1128
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1131
731D
80-th Level Archeology
brute force
,
data structures
,
greedy
,
sortings
2200
x1145
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1150
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1172
243B
Hydra
graphs
,
sortings
2000
x1173
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1180
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1184
648B
Собери стол
constructive algorithms
,
sortings
800
x1189
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1191
1005E2
Median on Segments (General Case Edition)
sortings
2400
x1203
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1221
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1224
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1230
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1233
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1253
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1255
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1260
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1287
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1306
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1310
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1311
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1318
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1333
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1344
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1353
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