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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
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
Standings
Custom test
Problems
#
Name
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1243
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3832
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x12290
1823B
Sort with Step
brute force
,
math
,
sortings
900
x16024
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x16143
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2428
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x7052
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x6140
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10444
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16732
1822C
Bun Lover
math
800
x23014
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24736
1822A
TubeTube Feed
brute force
,
implementation
800
x24257
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x752
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2373
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4967
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14287
1821B
Sort the Subarray
brute force
,
greedy
1100
x18577
1821A
Matching
combinatorics
,
math
800
x19781
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x14687
1820A
Yura's New Name
implementation
,
strings
800
x16683
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x132
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x283
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x638
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1473
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3586
1819A
Constructive Problem
brute force
,
greedy
1300
x12686
1818B
Indivisible
constructive algorithms
900
x14981
1818A
Politics
greedy
,
implementation
800
x12960
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x206
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x260
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x779
1817C
Similar Polynomials
combinatorics
,
math
2400
x979
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x4137
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x11015
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x15265
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17575
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x227
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x348
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1160
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1972
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3040
1815A
Ian and Array Sorting
greedy
,
math
1300
x14113
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x622
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1347
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x869
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10807
1814B
Long Legs
brute force
,
math
1700
x10011
1814A
Coins
implementation
,
math
800
x28902
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5932
1812I
Mountain Climber
*special problem
x268
1812H
Expected Twist
*special problem
,
interactive
x149
1812G
Colour Vision
*special problem
,
implementation
x553
1812F
Factorization
*special problem
,
number theory
x1255
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x4011
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4661
1812C
Digits
*special problem
x1268
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5694
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13291
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1762
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x2075
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1837
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x12320
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7497
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19863
1811B
Conveyor Belts
implementation
,
math
1000
x20365
1811A
Insert Digit
greedy
,
math
,
strings
800
x31099
1810H
Last Number
combinatorics
,
math
2900
x140
1810G
The Maximum Prefix
dp
3200
x712
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x572
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3183
1810D
Climbing the Tree
binary search
,
math
1700
x7443
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14507
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17521
1810A
Beautiful Sequence
brute force
,
greedy
800
x20706
1809G
Prediction
combinatorics
,
dp
,
math
2800
x443
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x767
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x840
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x6298
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12778
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19795
1809A
Garland
implementation
800
x23859
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x443
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x692
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1333
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2314
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3793
1808B
Playing in a Casino
math
,
sortings
1200
x16927
1808A
Lucky Numbers
brute force
,
implementation
900
x18191
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x19343
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18896
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6297
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12992
1807D
Odd Queries
data structures
,
implementation
900
x32647
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x30423
1807B
Grab the Candies
greedy
800
x41875
1807A
Plus or Minus
implementation
800
x61584
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x297
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x354
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2835
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