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Codeforces Round (Div. 2)
2 days
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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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Problems
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Status
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Custom test
Problems
#
Name
1822C
Bun Lover
math
800
x22550
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24341
1822A
TubeTube Feed
brute force
,
implementation
800
x23901
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x723
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2299
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4845
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13866
1821B
Sort the Subarray
brute force
,
greedy
1100
x17591
1821A
Matching
combinatorics
,
math
800
x19551
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13890
1820A
Yura's New Name
implementation
,
strings
800
x16492
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x129
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x274
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x607
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1418
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3485
1819A
Constructive Problem
brute force
,
greedy
1300
x12310
1818B
Indivisible
constructive algorithms
900
x14403
1818A
Politics
greedy
,
implementation
800
x12791
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x186
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x256
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x692
1817C
Similar Polynomials
combinatorics
,
math
2400
x941
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3955
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10639
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x14943
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17081
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x218
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x332
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1078
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1914
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2932
1815A
Ian and Array Sorting
greedy
,
math
1300
x13711
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x527
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1274
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x834
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10450
1814B
Long Legs
brute force
,
math
1700
x9729
1814A
Coins
implementation
,
math
800
x26757
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5835
1812I
Mountain Climber
*special problem
x258
1812H
Expected Twist
*special problem
,
interactive
x138
1812G
Colour Vision
*special problem
,
implementation
x536
1812F
Factorization
*special problem
,
number theory
x968
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3967
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4357
1812C
Digits
*special problem
x1244
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5624
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13150
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1682
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1983
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1767
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11833
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7207
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19225
1811B
Conveyor Belts
implementation
,
math
1000
x19945
1811A
Insert Digit
greedy
,
math
,
strings
800
x30457
1810H
Last Number
combinatorics
,
math
2900
x133
1810G
The Maximum Prefix
dp
3200
x651
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x552
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3065
1810D
Climbing the Tree
binary search
,
math
1700
x7245
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14115
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17284
1810A
Beautiful Sequence
brute force
,
greedy
800
x20502
1809G
Prediction
combinatorics
,
dp
,
math
2800
x429
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x728
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x807
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x6084
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12248
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19318
1809A
Garland
implementation
800
x23635
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x427
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x661
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1275
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2233
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3661
1808B
Playing in a Casino
math
,
sortings
1200
x15549
1808A
Lucky Numbers
brute force
,
implementation
900
x17671
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x18274
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18230
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6032
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12205
1807D
Odd Queries
data structures
,
implementation
900
x30064
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29679
1807B
Grab the Candies
greedy
800
x40622
1807A
Plus or Minus
implementation
800
x58082
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x282
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x342
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2736
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x866
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7373
1806B
Mex Master
constructive algorithms
,
greedy
900
x17318
1806A
Walking Master
geometry
,
greedy
,
math
800
x23169
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x335
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x850
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1554
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6263
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12234
1805B
The String Has a Target
greedy
,
strings
800
x18342
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