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m1.codeforces.com
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Contest is running
Codeforces Round 877 (Div. 2)
01:56:28
*has extra registration
→ Filter Problems
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
Standings
Custom test
Problems
#
Name
1839E
Decreasing Game
constructive algorithms
,
dp
,
greedy
,
interactive
x426
1839D
Ball Sorting
data structures
,
dp
,
sortings
x829
1839C
Insert Zero and Invert Prefix
constructive algorithms
,
greedy
x6249
1839B
Lamps
data structures
,
greedy
,
sortings
x8773
1839A
The Good Array
greedy
,
math
x11744
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
x1294
1837E
Playoff Fixing
combinatorics
,
trees
x1431
1837D
Bracket Coloring
constructive algorithms
,
greedy
x8926
1837C
Best Binary String
constructive algorithms
,
greedy
x15711
1837B
Comparison String
greedy
x17972
1837A
Grasshopper on a Line
constructive algorithms
,
math
x21158
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x2866
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x4212
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x6293
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x9132
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x20243
1833B
Restore the Weather
greedy
,
sortings
900
x18962
1833A
Musical Puzzle
implementation
,
strings
800
x24729
1832F
Zombies
binary search
,
dp
3200
x168
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x1483
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1331
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2160
1832C
Contrast Value
greedy
,
implementation
1200
x12115
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x13743
1832A
New Palindrome
strings
800
x19566
1831B
Array merging
constructive algorithms
,
greedy
x12672
1831A
Twin Permutations
constructive algorithms
x17466
1830F
The Third Grace
data structures
,
dp
x41
1830E
Bully Sort
data structures
,
math
x73
1830D
Mex Tree
brute force
,
dp
,
trees
x266
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
x904
1830B
The BOSS Can Count Pairs
brute force
,
math
x2873
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
x8012
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x4065
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x5625
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x10295
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x12299
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x16184
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x19687
1829B
Blank Space
implementation
800
x26131
1829A
Love Story
implementation
,
strings
800
x28602
1828B
Permutation Swap
math
,
number theory
900
x14948
1828A
Divisible Array
constructive algorithms
,
math
800
x18464
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x59
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x169
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x391
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x686
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1151
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x2611
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x13015
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x233
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1068
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x4943
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x8780
1826B
Lunatic Never Content
math
,
number theory
1100
x11125
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x10425
1825B
LuoTianyi and the Table
greedy
,
math
1000
x11288
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x15551
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x81
1824D
LuoTianyi and the Function
data structures
3000
x259
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x813
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x1867
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x3138
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x8116
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x460
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x912
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x2742
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x8674
1823B
Sort with Step
brute force
,
math
,
sortings
900
x11905
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x13248
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x1562
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x4345
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x3471
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x6507
1822D
Super-Permutation
constructive algorithms
,
math
1200
x11654
1822C
Bun Lover
math
800
x17887
1822B
Karina and Array
greedy
,
math
,
sortings
800
x19199
1822A
TubeTube Feed
brute force
,
implementation
800
x19280
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x499
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x1579
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x3574
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x9923
1821B
Sort the Subarray
brute force
,
greedy
1100
x12944
1821A
Matching
combinatorics
,
math
800
x16073
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x10183
1820A
Yura's New Name
implementation
,
strings
800
x13660
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x87
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x163
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x446
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1043
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x2600
1819A
Constructive Problem
brute force
,
greedy
1300
x9153
1818B
Indivisible
constructive algorithms
900
x10532
1818A
Politics
greedy
,
implementation
800
x10625
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x88
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x155
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x440
1817C
Similar Polynomials
combinatorics
,
math
2400
x723
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x2724
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x7373
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