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Contest is running
Codeforces Round 876 (Div. 2)
01:07:49
Before contest
Codeforces Round 877 (Div. 2)
23:07:49
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2-sat
binary search
bitmasks
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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
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number theory
probabilities
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sortings
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#
Name
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
x1278
1837D
Bracket Coloring
constructive algorithms
,
greedy
x8877
1837C
Best Binary String
constructive algorithms
,
greedy
x15608
1837B
Comparison String
greedy
x17866
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x2831
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x9082
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x20124
1833B
Restore the Weather
greedy
,
sortings
900
x18870
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1321
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2152
1832C
Contrast Value
greedy
,
implementation
1200
x12050
1831B
Array merging
constructive algorithms
,
greedy
x12571
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
x886
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x19634
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x58
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
x390
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1144
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x2600
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x4915
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x8747
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x10389
1825B
LuoTianyi and the Table
greedy
,
math
1000
x11266
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x15509
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x811
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x8091
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x8645
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x6491
1822B
Karina and Array
greedy
,
math
,
sortings
800
x19163
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x1579
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x3569
1821B
Sort the Subarray
brute force
,
greedy
1100
x12919
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x2591
1819A
Constructive Problem
brute force
,
greedy
1300
x9136
1818A
Politics
greedy
,
implementation
800
x10597
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x155
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x7355
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x12319
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1396
1815A
Ian and Array Sorting
greedy
,
math
1300
x10589
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x7694
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x15356
1811A
Insert Digit
greedy
,
math
,
strings
800
x24454
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2245
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x10934
1810A
Beautiful Sequence
brute force
,
greedy
800
x18000
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x549
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x4509
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x9166
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x16063
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x2740
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x13941
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x14443
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x24005
1807B
Grab the Candies
greedy
800
x31316
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x178
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x220
1806B
Mex Master
constructive algorithms
,
greedy
900
x14468
1806A
Walking Master
geometry
,
greedy
,
math
800
x18468
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x218
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x4415
1805B
The String Has a Target
greedy
,
strings
800
x16073
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x3705
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x9338
1804B
Vaccination
greedy
,
implementation
1000
x11880
1804A
Lame King
greedy
,
math
800
x16229
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x10927
1802A
Likes
greedy
,
implementation
800
x13834
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x1404
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x2330
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x4438
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x9077
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x9312
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x15952
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x16941
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x17948
1800B
Count the Number of Pairs
greedy
,
strings
1000
x19474
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x589
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x944
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x4304
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x8702
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x10297
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x6879
1798C
Candy Store
greedy
,
math
,
number theory
1700
x6390
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x13428
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x17405
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x5645
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x11697
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x14478
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x505
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x2858
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x848
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1580
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x18319
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x751
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x9652
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x14962
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x719
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x4642
1793A
Yet Another Promotion
greedy
,
math
800
x16203
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