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Before contest
Educational Codeforces Round 166 (Rated for Div. 2)
41:16:55
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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
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5264
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4378
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3943
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3429
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2937
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2856
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2613
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1331
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10236
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9779
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9342
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8029
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7594
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7383
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6924
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6912
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6472
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6283
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6230
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6083
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6060
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6030
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5812
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5755
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5750
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5609
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5530
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5525
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5325
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5294
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5229
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4952
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4569
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4423
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4383
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4176
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4113
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3302
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3109
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3017
853B
Jury Meeting
greedy
,
sortings
,
two pointers
1800
x2504
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2226
846F
Random Query
data structures
,
math
,
probabilities
,
two pointers
1800
x2209
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1725
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1725
958F2
Lightsabers (medium)
binary search
,
two pointers
1800
x1203
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x11560
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9839
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8041
505C
Mr. Kitayuta, the Treasure Hunter
dfs and similar
,
dp
,
two pointers
1900
x6105
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6034
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5893
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5554
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5552
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5513
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5244
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4923
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4796
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4622
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4332
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4323
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4303
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4255
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4068
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3893
1168B
Good Triple
brute force
,
two pointers
1900
x3502
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3450
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3310
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3026
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x3013
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2940
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2909
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2433
190D
Non-Secret Cypher
two pointers
1900
x2241
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2174
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2128
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x2007
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1939
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1816
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1622
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1222
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x876
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8986
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8362
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5913
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5434
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4866
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4855
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4635
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4495
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4389
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4174
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4164
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4138
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3932
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3920
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3891
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3745
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3689
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3545
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