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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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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Status
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Custom test
Problems
#
Name
466B
Wonder Room
brute force
,
math
2000
x4583
464C
Substitutes in Number
dp
2100
x1650
464B
Restore Cube
brute force
,
geometry
2000
x1657
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1380
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5296
457C
Elections
brute force
2100
x859
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5111
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4511
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1395
451D
Count Good Substrings
math
2000
x4630
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x7956
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3511
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1057
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1470
435D
Special Grid
brute force
,
dp
,
greedy
2000
x743
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1034
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8140
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2102
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1391
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2163
413D
2048
bitmasks
,
dp
2000
x748
412D
Giving Awards
dfs and similar
2000
x1782
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3956
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x930
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2788
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3072
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x410
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x709
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6059
382B
Number Busters
binary search
,
math
2000
x1382
380C
Sereja and Brackets
data structures
,
schedules
2000
x13480
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1479
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x841
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2836
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x3614
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1201
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x603
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1697
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1268
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x891
360B
Levko and Array
binary search
,
dp
2000
x2693
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4803
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x1940
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1226
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2965
353D
Queue
constructive algorithms
,
dp
2000
x2710
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2034
346B
Lucky Common Subsequence
dp
,
strings
2000
x3309
345C
Counting Fridays
*special problem
2000
x121
345B
Triskaidekaphobia
*special problem
2100
x121
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5380
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x486
340E
Iahub and Permutations
combinatorics
,
math
2000
x2296
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2016
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5765
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x929
335C
More Reclamation
games
2100
x514
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x1842
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6711
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x4702
317B
Ants
brute force
,
implementation
2000
x1541
314C
Sereja and Subsequences
data structures
,
dp
2000
x1758
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1451
313D
Ilya and Roads
dp
2100
x1410
309B
Context Advertising
dp
,
two pointers
2100
x497
309A
Morning run
binary search
,
math
,
two pointers
2000
x457
306C
White, Black and White Again
combinatorics
,
number theory
2100
x434
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x436
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2103
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2044
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1653
292C
Beautiful IP Addresses
brute force
2000
x928
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1267
286C
Main Sequence
greedy
,
implementation
2100
x1282
283C
Coin Troubles
dp
2100
x1229
282D
Yet Another Number Game
dp
,
games
2100
x1372
280A
Rectangle Puzzle
geometry
2000
x1440
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1538
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1589
268E
Playlist
math
,
probabilities
,
sortings
2100
x971
267B
Dominoes
dfs and similar
,
graphs
2000
x607
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1333
264C
Choosing Balls
dp
2000
x2656
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1050
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x758
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1307
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1752
254E
Dormitory
dp
,
implementation
2100
x483
253D
Table with Letters - 2
brute force
,
two pointers
2000
x804
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1010
250E
Mad Joe
brute force
2000
x437
248C
Robo-Footballer
binary search
,
geometry
2000
x792
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x858
243B
Hydra
graphs
,
sortings
2000
x1173
242E
XOR on Segment
bitmasks
,
data structures
2000
x8345
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1802
241C
Mirror Box
geometry
,
implementation
2000
x506
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1017
237E
Build String
flows
,
graphs
2000
x1581
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x542
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