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Codeforces Round 973 (Div. 2)
13:25:08
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Difficulty:
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brute force
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
#
Name
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x814
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3932
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x17725
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x577
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3238
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1706
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x25732
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x6005
1884A
Simple Design
brute force
,
greedy
,
math
800
x17357
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x1005
1882C
Card Game
brute force
,
greedy
1500
x12226
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x15312
1881C
Perfect Square
brute force
,
implementation
1200
x16970
1881A
Don't Try to Count
brute force
,
strings
800
x31472
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x508
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1250
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1174
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x4074
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x123
1875A
Jellyfish and Undertale
brute force
,
greedy
900
x25055
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1136
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x16919
1873B
Good Kid
brute force
,
greedy
,
math
800
x48080
1873A
Short Sort
brute force
,
implementation
800
x53399
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x4236
1872A
Two Vessels
brute force
,
greedy
,
math
800
x38967
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2333
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x419
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5728
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x757
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x702
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6727
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2747
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x6203
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x16834
1859E
Maximum Monogonosity
brute force
,
dp
,
math
2500
x1764
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16923
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1321
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2810
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x11248
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x12228
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x26391
1854F
Mark and Spaceship
brute force
,
dp
3500
x119
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x414
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3501
1853B
Fibonaccharsis
binary search
,
brute force
,
math
1200
x17334
1853A
Desorting
brute force
,
greedy
,
math
800
x31545
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x29438
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x18940
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x36420
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x10458
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x782
1848D
Vika and Bonuses
binary search
,
brute force
,
math
,
ternary search
2200
x2600
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x328
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12813
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x6989
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x16760
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26814
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7765
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x777
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x12218
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7785
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1786
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x984
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x934
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7775
1834F
Typewriter
brute force
,
math
2500
x523
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4626
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x13273
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2149
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x21740
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x669
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4862
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x26149
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1199
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1591
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x9662
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x15111
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1232
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15991
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2411
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6989
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x6093
1822A
TubeTube Feed
brute force
,
implementation
800
x24191
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2357
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4948
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14222
1821B
Sort the Subarray
brute force
,
greedy
1100
x18421
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x632
1819A
Constructive Problem
brute force
,
greedy
1300
x12639
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x260
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x4096
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3022
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x612
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x860
1814B
Long Legs
brute force
,
math
1700
x9954
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5683
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3164
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14456
1810A
Beautiful Sequence
brute force
,
greedy
800
x20677
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