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Codeforces Round (Div. 2)
3 days
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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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Custom test
Problems
#
Name
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1656
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x523
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1174
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2264
522D
Closest Equals
*special problem
,
data structures
2000
x3041
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8747
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6414
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6306
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x38352
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x5946
515E
Drazil and Park
data structures
2300
x2070
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4197
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6593
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20419
513D2
Constrained Tree
constructive algorithms
,
data structures
2600
x369
501D
Misha and Permutations Summation
data structures
2000
x2364
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5530
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15807
500E
New Year Domino
data structures
,
dp
,
dsu
2300
x1406
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1082
494E
Sharti
data structures
,
games
3200
x309
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x519
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6720
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1581
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2185
487D
Conveyor Belts
data structures
2700
x841
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3396
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2169
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2199
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2473
482E
ELCA
data structures
,
trees
3200
x176
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6275
480E
Parking Lot
data structures
,
divide and conquer
2800
x518
477E
Dreamoon and Notepad
data structures
3100
x132
475F
Meta-universe
data structures
2900
x227
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4633
474F
Ant colony
data structures
,
math
,
number theory
2100
x8150
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3187
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x394
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x81
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x769
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x35117
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1369
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1313
460C
Present
binary search
,
data structures
,
greedy
1700
x6094
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9745
455E
Function
data structures
2900
x665
455D
Serega and Fun
data structures
2700
x2848
453E
Little Pony and Lord Tirek
data structures
3100
x678
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1409
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1048
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3223
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3553
444C
DZY Loves Colors
data structures
2400
x2807
442D
Adam and Tree
data structures
,
trees
2600
x967
442C
Artem and Array
data structures
,
greedy
2500
x1639
438D
The Child and Sequence
data structures
,
math
2300
x8038
436F
Banners
brute force
,
data structures
,
dp
3000
x371
436E
Cardboard Box
data structures
,
greedy
2600
x1284
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x914
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2685
427B
Prison Transfer
data structures
,
implementation
1100
x13789
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1407
425C
Sereja and Two Sequences
data structures
,
dp
2300
x886
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x558
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x501
420D
Cup Trick
data structures
2200
x780
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1225
418E
Tricky Password
data structures
3100
x300
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x472
414E
Mashmokh's Designed Problem
data structures
3200
x197
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x676
413E
Maze 2D
data structures
,
divide and conquer
2200
x675
407E
k-d-sequence
data structures
3100
x696
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x203
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x938
398D
Instant Messanger
data structures
x854
396C
On Changing Tree
data structures
,
graphs
,
trees
x1549
392D
Three Arrays
data structures
x211
391D2
Supercollider
data structures
x178
390C
Inna and Candy Boxes
data structures
x625
387E
George and Cards
binary search
,
data structures
2200
x864
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9480
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6205
383A
Milking cows
data structures
,
greedy
1600
x5223
380E
Sereja and Dividing
data structures
2600
x295
380C
Sereja and Brackets
data structures
,
schedules
2000
x14137
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2173
377D
Developing Game
data structures
2400
x1106
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1979
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6343
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x4978
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x179
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x852
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x947
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x3741
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5427
369E
Valera and Queries
binary search
,
data structures
2200
x2072
368B
Sereja and Suffixes
data structures
,
dp
1100
x40164
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2428
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