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Before contest
Codeforces Round 950 (Div. 3)
39:05:26
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→ Filter Problems
Difficulty:
—
two pointers
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
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x13316
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x13946
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x120
682E
Alyona and Triangles
geometry
,
two pointers
2600
x648
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18239
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x579
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9128
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3110
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3310
645C
Enduring Exodus
binary search
,
two pointers
1600
x3166
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2614
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x780
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x572
627E
Orchestra
two pointers
3000
x535
620D
Professor GukiZ and Two Arrays
binary search
,
two pointers
2200
x1649
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1311
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x8849
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2174
611G
New Year and Cake
geometry
,
two pointers
2900
x426
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1450
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2616
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10474
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27774
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x674
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x209
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x852
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x25100
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x11571
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2226
524D
Social Network
greedy
,
two pointers
2100
x946
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6287
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1230
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4149
505C
Mr. Kitayuta, the Treasure Hunter
dfs and similar
,
dp
,
two pointers
1900
x6110
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1150
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6690
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x46892
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3370
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6805
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34784
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12278
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x756
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x5839
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8397
430B
Balls Game
brute force
,
two pointers
1400
x3636
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13076
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1223
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8683
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x675
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x229
391A
Genetic Engineering
implementation
,
two pointers
x1703
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x11942
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x748
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3493
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x656
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x61076
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x915
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12432
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1211
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1271
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x536
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4870
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2909
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7395
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x517
309B
Context Advertising
dp
,
two pointers
2100
x500
309A
Morning run
binary search
,
math
,
two pointers
2000
x460
302B
Eugeny and Play List
binary search
,
implementation
,
two pointers
1200
x7834
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x235
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2938
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4387
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8091
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x48476
264D
Colorful Stones
dp
,
two pointers
2500
x408
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10627
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x406
253D
Table with Letters - 2
brute force
,
two pointers
2000
x811
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10357
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16845
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x877
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x210
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5594
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8345
229D
Towers
dp
,
greedy
,
two pointers
2100
x2123
229A
Shifts
brute force
,
two pointers
1500
x3453
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7179
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2128
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1340
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1331
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1100
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x277
190D
Non-Secret Cypher
two pointers
1900
x2243
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1736
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1291
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x347
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11924
164B
Ancient Berland Hieroglyphs
two pointers
2000
x451
163C
Conveyor
sortings
,
two pointers
2100
x538
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4694
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x168
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