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When submitting a solution in C++, please select either C++14 (GCC 6-32) or C++17 (GCC 7-32) as your compiler.
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Codeforces Round 936 (Div. 2)
2 days
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Difficulty:
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dp
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
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
x11037
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
x16095
1943F
Minimum Hamming Distance
dp
x19
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
x260
1943D1
Counting Is Fun (Easy Version)
combinatorics
,
dp
,
math
x728
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x6692
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x14618
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x26285
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x23165
1939D
Big Persimmon
*special problem
,
dp
,
games
x46
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x11
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x11635
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x6167
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x14983
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x1913
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x2801
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x24742
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x180
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x885
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2198
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3392
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1359
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x3820
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1388
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1384
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x17123
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2554
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1280
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x8722
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x20732
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3028
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x114
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x701
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x11674
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x2766
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x15062
1922F
Replace on Segment
dp
,
graph matchings
2500
x1081
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1039
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3252
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2195
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x699
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x731
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16080
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x3999
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x847
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1571
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x18289
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x483
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x564
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x124
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1144
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1577
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3484
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x16857
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2524
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1773
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x37
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x162
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x65
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x786
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1563
1906J
Count BFS Graph
combinatorics
,
dp
2100
x586
1906H
Twin Friends
combinatorics
,
dp
2200
x564
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x1210
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x792
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x11937
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x666
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3483
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1303
1901D
Yet Another Monster Fight
binary search
,
dp
,
greedy
,
implementation
,
math
1700
x5818
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1692
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3494
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x9848
1900B
Laura and Operations
dp
,
math
900
x15366
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x17060
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x77
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x71
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x162
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x597
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1411
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x9738
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x149
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x66
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x848
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x2890
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1285
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2688
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5178
1883C
Raspberries
dp
,
math
1000
x20989
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4714
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5587
1881E
Block Sequence
dp
1500
x10896
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6300
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x14205
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x210
1875D
Jellyfish and Mex
dp
1600
x7083
1874G
Jellyfish and Inscryption
dp
3500
x61
1874F
Jellyfish and OEIS
dp
3500
x131
1874E
Jellyfish and Hack
dp
,
math
3000
x237
1874D
Jellyfish and Miku
divide and conquer
,
dp
,
math
,
probabilities
2800
x615
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