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Before contest
Codeforces Round 977 (Div. 2)
2 days
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→ 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
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12658
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x15381
1881D
Divide and Equalize
math
,
number theory
1300
x17107
1881C
Perfect Square
brute force
,
implementation
1200
x17052
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x16923
1877C
Joyboard
math
,
number theory
1200
x10928
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x17009
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x15447
1873E
Building an Aquarium
binary search
,
sortings
1100
x26592
1872D
Plus Minus Permutation
math
1200
x23922
1872C
Non-coprime Split
math
,
number theory
1100
x23367
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11467
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x14141
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x16066
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x11981
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x11218
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16715
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x13467
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x15351
1863C
MEX Repetition
implementation
,
math
1100
x14009
1863B
Split Sort
greedy
,
math
,
sortings
1100
x15260
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x17172
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x20783
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x16920
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16980
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x19511
1857C
Assembly via Minimums
greedy
,
sortings
1200
x25987
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x22977
1853B
Fibonaccharsis
binary search
,
brute force
,
math
1200
x17407
1851D
Prefix Permutation Sums
implementation
,
math
1300
x15192
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x19111
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x23167
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x14940
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x16895
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x19374
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x18904
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x15645
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x18025
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x17049
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x22437
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11962
1839B
Lamps
greedy
,
sortings
1100
x15120
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x16395
1836B
Astrophysicists
greedy
,
math
1100
x12637
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13274
1832C
Contrast Value
greedy
,
implementation
1200
x20733
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x21941
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x17525
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x19996
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x19016
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13557
1826B
Lunatic Never Content
math
,
number theory
1100
x17638
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x15183
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x12280
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16718
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14279
1821B
Sort the Subarray
brute force
,
greedy
1100
x18539
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x14659
1819A
Constructive Problem
brute force
,
greedy
1300
x12672
1815A
Ian and Array Sorting
greedy
,
math
1300
x14106
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19846
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14491
1808B
Playing in a Casino
math
,
sortings
1200
x16872
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x19308
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18878
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12971
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x23556
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x22455
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x11352
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x15966
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x13813
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x20289
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15809
1792B
Stand-up Comedian
greedy
,
math
1200
x21349
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x22582
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x28340
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x20171
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x17217
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x20027
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x13246
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8967
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17766
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x18074
1778B
The Forbidden Permutation
greedy
,
math
1300
x13295
1776H
Beppa and SwerChat
two pointers
1300
x6390
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x13878
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x12005
1769C2
Подкрутка II
*special problem
,
dp
1300
x965
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x969
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x14182
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13651
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14600
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16939
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x20282
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x17620
1753A1
Make Nonzero Sum (easy version)
constructive algorithms
,
dp
,
greedy
1300
x14904
1747C
Swap Game
games
1200
x21210
1746C
Permutation Operations
constructive algorithms
,
greedy
,
implementation
,
math
1300
x12797
1744D
Divisibility by 2^n
greedy
,
math
,
sortings
1200
x21394
1743C
Save the Magazines
constructive algorithms
,
dp
,
greedy
1100
x19158
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