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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
39:58:25
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Difficulty:
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data structures
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
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1107
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9112
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x364
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x427
1137E
Train Car Selection
data structures
,
greedy
2700
x488
1136E
Nastya Hasn't Written a Legend
binary search
,
data structures
2200
x1037
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x944
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x398
1129D
Isolation
data structures
,
dp
2900
x936
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x895
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x247
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x646
1117G
Recursive Queries
data structures
2500
x637
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1805
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x838
1110F
Nearest Leaf
data structures
,
trees
2600
x1674
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x277
1109E
Sasha and a Very Easy Test
data structures
,
number theory
2700
x491
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x242
1108E2
Array and Segments (Hard version)
data structures
,
implementation
2100
x2108
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x984
1106E
Lunar New Year and Red Envelopes
data structures
,
dp
2100
x2311
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13855
1106B
Lunar New Year and Food Ordering
data structures
,
implementation
1500
x6680
1104B
Game with string
data structures
,
implementation
,
math
1200
x14391
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4388
1100F
Ivan and Burgers
data structures
,
divide and conquer
,
greedy
,
math
2500
x2077
1100B
Build a Contest
data structures
,
implementation
1300
x10875
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x906
1098D
Eels
data structures
2800
x700
1093G
Multidimensional Queries
bitmasks
,
data structures
2300
x1818
1093E
Intersection of Permutations
data structures
2400
x1481
1092D2
Great Vova Wall (Version 2)
data structures
,
implementation
2200
x2819
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x972
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x477
1089K
King Kog's Reception
data structures
2400
x1064
1088F
Ehab and a weird weight formula
data structures
,
trees
2800
x487
1085G
Beautiful Matrix
combinatorics
,
data structures
,
dp
2900
x504
1083F
The Fair Nut and Amusing Xor
data structures
3300
x264
1083E
The Fair Nut and Rectangles
data structures
,
dp
,
geometry
2400
x3751
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x223
1083C
Max Mex
data structures
,
trees
2900
x836
1083A
The Fair Nut and the Best Path
data structures
,
dp
,
trees
1800
x5177
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x96
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x668
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x2849
1076G
Array Game
data structures
,
games
3000
x434
1076E
Vasya and a Tree
data structures
,
trees
1900
x3596
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x859
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6302
1070E
Getting Deals Done
binary search
,
data structures
2100
x1189
1070C
Cloud Computing
data structures
,
greedy
2000
x1994
1070B
Berkomnadzor
data structures
,
greedy
2400
x467
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x5982
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x795
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1698
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2288
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x8311
1060G
Balls and Pockets
data structures
3400
x131
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1349
1056H
Detect Robots
data structures
,
strings
3200
x142
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x237
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1959
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x346
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x863
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x159
1045G
AI robots
data structures
2200
x1517
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x313
1044F
DFS
data structures
2700
x498
1044D
Deduction Queries
data structures
,
dsu
2400
x967
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x214
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1233
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5681
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1437
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3497
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x5783
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9224
1039E
Summer Oenothera Exhibition
data structures
3400
x262
1039D
You Are Given a Tree
data structures
,
dp
,
trees
2800
x1632
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x770
1037H
Security
data structures
,
string suffix structures
3200
x951
1037F
Maximum Reduction
combinatorics
,
data structures
,
math
2500
x928
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x429
1030F
Putting Boxes Together
data structures
2500
x788
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1707
1023G
Pisces
data structures
,
flows
,
trees
3400
x111
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x3942
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x325
1017G
The Tree
data structures
3200
x783
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3323
1010E
Store
data structures
2700
x318
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5058
1007D
Ants
2-sat
,
data structures
,
trees
3200
x254
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x11967
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20099
1004F
Sonya and Bitwise OR
bitmasks
,
data structures
,
divide and conquer
2600
x689
1004E
Sonya and Ice Cream
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
trees
2400
x1006
1000G
Two-Paths
data structures
,
dp
,
trees
2700
x549
1000F
One Occurrence
data structures
,
divide and conquer
2400
x3491
1000C
Covered Points Count
data structures
,
implementation
,
sortings
1700
x6415
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