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Before contest
Codeforces Round 941 (Div. 1)
25:48:16
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Before contest
Codeforces Round 941 (Div. 2)
25:48:17
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constructive algorithms
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
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Problems
#
Name
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1385
1818B
Indivisible
constructive algorithms
900
x13994
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x664
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3812
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x14669
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16913
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x213
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1843
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2825
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10133
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5782
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3934
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4330
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7004
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x18817
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17114
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5864
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x11865
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7170
1806B
Mex Master
constructive algorithms
,
greedy
900
x17008
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8080
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11984
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12094
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1151
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10788
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x8988
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7193
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x14435
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16892
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1042
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x19331
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18019
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15194
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1041
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14119
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1563
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x783
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x16399
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19186
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x626
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2169
1787A
Exponential Equation
constructive algorithms
,
math
800
x18673
1784B
Letter Exchange
constructive algorithms
1900
x3201
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17123
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x27090
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x213
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7012
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4629
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21042
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x300
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1214
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1684
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7455
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x22953
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22867
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1944
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3207
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x334
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x736
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12455
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x18248
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19290
1774H
Maximum Permutation
constructive algorithms
3500
x129
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x363
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7390
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11529
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x11520
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x21915
1773K
King's Puzzle
constructive algorithms
1900
x1378
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x95
1773F
Football
constructive algorithms
800
x3940
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1477
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2217
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x14847
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x22625
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12757
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x88
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3655
1770B
Koxia and Permutation
constructive algorithms
1000
x18991
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6668
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x13521
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9380
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x365
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3901
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x876
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6261
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15223
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x97
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3273
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16152
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1719
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9139
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x12983
1761A
Two Permutations
brute force
,
constructive algorithms
800
x16759
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4201
1758F
Decent Division
constructive algorithms
,
data structures
3000
x152
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6842
1758B
XOR = Average
constructive algorithms
900
x20055
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24328
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x18459
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