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Before contest
Codeforces Round 941 (Div. 1)
27:46:27
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Before contest
Codeforces Round 941 (Div. 2)
27:46:27
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→ Filter Problems
Difficulty:
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implementation
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
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Custom test
Problems
#
Name
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14462
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10759
1822A
TubeTube Feed
brute force
,
implementation
800
x23565
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13535
1820A
Yura's New Name
implementation
,
strings
800
x16330
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1385
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3413
1818A
Politics
greedy
,
implementation
800
x12689
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x664
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2825
1814A
Coins
implementation
,
math
800
x25451
1812G
Colour Vision
*special problem
,
implementation
x520
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5561
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1715
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7004
1811B
Conveyor Belts
implementation
,
math
1000
x19681
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x703
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
1809A
Garland
implementation
800
x23380
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3560
1808A
Lucky Numbers
brute force
,
implementation
900
x17272
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17593
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17776
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5843
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11783
1807D
Odd Queries
data structures
,
implementation
900
x28457
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29067
1807A
Plus or Minus
implementation
800
x55266
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x806
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4409
1804B
Vaccination
greedy
,
implementation
1000
x13749
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12875
1802A
Likes
greedy
,
implementation
800
x15500
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1918
1800A
Is It a Cat?
implementation
,
strings
800
x29891
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1151
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11339
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15844
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19313
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3682
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16891
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x15986
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18530
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11339
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23211
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1271
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5734
1791C
Prepend and Append
implementation
,
two pointers
800
x40175
1791B
Following Directions
geometry
,
implementation
800
x41610
1791A
Codeforces Checking
implementation
,
strings
800
x54530
1790C
Premutation
brute force
,
implementation
,
math
1000
x22865
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35514
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x511
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x755
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1563
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8026
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15745
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x783
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19185
1788A
One and Two
brute force
,
implementation
,
math
800
x27367
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x626
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3253
1786A2
Alternating Deck (hard version)
implementation
800
x11199
1786A1
Non-alternating Deck (easy version)
implementation
800
x13585
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x405
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4154
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7008
1778A
Flip Flop Sum
greedy
,
implementation
800
x23730
1775E
The Human Equation
greedy
,
implementation
2100
x3015
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19290
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x636
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1017
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7389
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x453
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x729
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1260
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2217
1772B
Matrix Rotation
brute force
,
implementation
800
x28121
1772A
A+B?
implementation
800
x43715
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x657
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3655
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1309
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x13520
1767A
Cut the Triangle
implementation
800
x20111
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13047
1766B
Notepad#
implementation
1000
x20043
1766A
Extremely Round
brute force
,
implementation
800
x23759
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x560
1765I
Infinite Chess
implementation
,
shortest paths
2800
x181
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1181
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1952
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13857
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16152
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x12983
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22264
1760C
Advantage
data structures
,
implementation
,
sortings
800
x34814
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x41456
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