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Before contest
Codeforces Round 937 (Div. 4)
04:37:57
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Difficulty:
—
greedy
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
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6283
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6283
620C
Pearls in a Row
greedy
1500
x6283
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6279
288A
Polo the Penguin and Strings
greedy
1300
x6256
1168A
Increasing by Modulo
binary search
,
greedy
1700
x6254
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x6251
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6247
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6216
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6201
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6192
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6188
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6184
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6180
1467C
Three Bags
constructive algorithms
,
greedy
1900
x6178
1283E
New Year Parties
dp
,
greedy
1800
x6175
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6156
1009D
Relatively Prime Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
1700
x6118
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6112
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6104
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6096
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6085
494A
Treasure
greedy
1500
x6084
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6082
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6081
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6062
1313C2
Skyscrapers (hard version)
data structures
,
dp
,
greedy
1900
x6060
584C
Marina and Vasya
constructive algorithms
,
greedy
,
strings
1700
x6049
1187C
Vasya And Array
constructive algorithms
,
greedy
,
implementation
1800
x6040
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6037
1861D
Sorting By Multiplication
dp
,
greedy
1800
x6035
760B
Frodo and pillows
binary search
,
greedy
1500
x6011
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x5995
460C
Present
binary search
,
data structures
,
greedy
1700
x5993
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x5962
1453C
Triangles
greedy
,
implementation
1700
x5960
1215D
Ticket Game
games
,
greedy
,
math
1700
x5950
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5936
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x5936
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x5931
808C
Tea Party
constructive algorithms
,
greedy
,
sortings
1400
x5928
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x5922
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x5921
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5918
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x5913
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x5904
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5904
1901D
Yet Another Monster Fight
binary search
,
dp
,
greedy
,
implementation
,
math
1700
x5902
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x5902
749C
Voting
greedy
,
implementation
,
two pointers
1500
x5895
1017C
The Phone Number
constructive algorithms
,
greedy
1600
x5871
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5867
1118D2
Coffee and Coursework (Hard Version)
binary search
,
greedy
1700
x5862
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5856
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x5856
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x5839
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5834
1495B
Let's Go Hiking
games
,
greedy
1900
x5811
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5811
864C
Bus
greedy
,
implementation
,
math
1500
x5808
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5800
464A
No to Palindromes!
greedy
,
strings
1700
x5796
1700D
River Locks
binary search
,
dp
,
greedy
,
math
1900
x5769
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5763
853A
Planning
greedy
1500
x5753
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5745
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5744
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x5727
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5705
190A
Vasya and the Bus
greedy
,
math
1100
x5688
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5686
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5662
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x5652
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5651
1210B
Marcin and Training Camp
brute force
,
greedy
1700
x5651
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5634
12C
Fruits
greedy
,
implementation
,
sortings
1100
x5628
628C
Bear and String Distance
greedy
,
strings
1300
x5626
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5622
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5621
1162B
Double Matrix
brute force
,
greedy
1400
x5619
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x5613
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x5597
1175D
Array Splitting
greedy
,
sortings
1900
x5594
1251D
Salary Changing
binary search
,
greedy
,
sortings
1900
x5587
1000B
Light It Up
greedy
1500
x5569
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5569
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5565
787B
Not Afraid
greedy
,
implementation
,
math
1300
x5565
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5554
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5554
203C
Photographer
greedy
,
sortings
1400
x5551
1268B
Domino for Young
dp
,
greedy
,
math
2000
x5540
985C
Liebig's Barrels
greedy
1500
x5537
1264B
Beautiful Sequence
brute force
,
constructive algorithms
,
greedy
1900
x5518
994B
Knights of a Polygonal Table
greedy
,
implementation
,
sortings
1400
x5505
313C
Ilya and Matrix
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x5504
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5496
712C
Memory and De-Evolution
greedy
,
math
1600
x5488
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5484
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