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Before contest
Codeforces Round 949 (Div. 2)
09:21:02
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Difficulty:
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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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Status
Standings
Custom test
Problems
#
Name
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17636
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x340
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1517
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8725
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12897
1826B
Lunatic Never Content
math
,
number theory
1100
x16008
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14590
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14252
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19338
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x126
1824D
LuoTianyi and the Function
data structures
3000
x460
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1267
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2508
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4363
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10891
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x797
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1201
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3673
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11750
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15405
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15851
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2330
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6573
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5661
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9801
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16016
1822C
Bun Lover
math
800
x22396
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24160
1822A
TubeTube Feed
brute force
,
implementation
800
x23709
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x713
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2269
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4788
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13706
1821B
Sort the Subarray
brute force
,
greedy
1100
x17132
1821A
Matching
combinatorics
,
math
800
x19424
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13539
1820A
Yura's New Name
implementation
,
strings
800
x16404
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x128
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x249
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x601
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1406
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3451
1819A
Constructive Problem
brute force
,
greedy
1300
x12152
1818B
Indivisible
constructive algorithms
900
x14139
1818A
Politics
greedy
,
implementation
800
x12729
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x182
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x252
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x676
1817C
Similar Polynomials
combinatorics
,
math
2400
x932
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3895
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10424
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x14793
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16975
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x215
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x330
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1060
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1882
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2878
1815A
Ian and Array Sorting
greedy
,
math
1300
x13548
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x471
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1261
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x825
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10269
1814B
Long Legs
brute force
,
math
1700
x9610
1814A
Coins
implementation
,
math
800
x26074
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5806
1812I
Mountain Climber
*special problem
x257
1812H
Expected Twist
*special problem
,
interactive
x136
1812G
Colour Vision
*special problem
,
implementation
x530
1812F
Factorization
*special problem
,
number theory
x962
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3953
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4345
1812C
Digits
*special problem
x1229
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5590
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13094
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1642
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1935
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1745
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11667
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7099
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19030
1811B
Conveyor Belts
implementation
,
math
1000
x19803
1811A
Insert Digit
greedy
,
math
,
strings
800
x30185
1810H
Last Number
combinatorics
,
math
2900
x132
1810G
The Maximum Prefix
dp
3200
x643
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x545
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2995
1810D
Climbing the Tree
binary search
,
math
1700
x7152
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x13903
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17204
1810A
Beautiful Sequence
brute force
,
greedy
800
x20428
1809G
Prediction
combinatorics
,
dp
,
math
2800
x422
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x713
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x796
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5940
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12016
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19131
1809A
Garland
implementation
800
x23483
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x423
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x654
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