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Before contest
Codeforces Round 946 (Div. 3)
29:47:13
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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
#
Name
25A
IQ test
brute force
1300
x81504
4C
Registration System
data structures
,
hashing
,
implementation
1300
x77522
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x70269
189A
Cut Ribbon
brute force
,
dp
1300
x62941
451B
Sort the Array
implementation
,
sortings
1300
x43205
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x38573
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x35357
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x32436
1360D
Buying Shovels
math
,
number theory
1300
x30897
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29124
1328B
K-th Beautiful String
binary search
,
brute force
,
combinatorics
,
implementation
,
math
1300
x28180
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27557
276B
Little Girl and Game
games
,
greedy
1300
x27315
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27102
1335D
Anti-Sudoku
constructive algorithms
,
implementation
1300
x26653
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x26231
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x26063
450B
Jzzhu and Sequences
implementation
,
math
1300
x25393
1352D
Alice, Bob and Candies
implementation
1300
x24932
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x24462
545D
Queue
greedy
,
implementation
,
sortings
1300
x24135
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23474
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x22632
508B
Anton and currency you all know
greedy
,
math
,
strings
1300
x22107
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x21742
1692F
3SUM
brute force
,
math
1300
x21415
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21306
1285B
Just Eat It!
dp
,
greedy
,
implementation
1300
x21105
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x20927
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20797
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20208
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19861
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19771
1203C
Common Divisors
implementation
,
math
1300
x19698
1366B
Shuffle
math
,
two pointers
1300
x19653
1476B
Inflation
binary search
,
brute force
,
greedy
,
math
1300
x19506
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19346
1341B
Nastya and Door
greedy
,
implementation
1300
x19053
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x18808
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18642
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18488
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18429
1037C
Equalize
dp
,
greedy
,
strings
1300
x18342
1618D
Array and Operations
dp
,
greedy
,
math
1300
x18325
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18309
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x18062
1433E
Two Round Dances
combinatorics
,
math
1300
x18055
1698C
3SUM Closure
brute force
,
data structures
1300
x17963
1373C
Pluses and Minuses
math
1300
x17950
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17804
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x17680
617B
Chocolate
combinatorics
1300
x17353
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17329
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x17320
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17038
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17028
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x16968
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16951
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16795
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16694
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x16577
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x16509
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x16498
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16476
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16422
330B
Road Construction
constructive algorithms
,
graphs
1300
x16381
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16310
1418B
Negative Prefixes
greedy
,
sortings
1300
x16300
1627B
Not Sitting
games
,
greedy
,
sortings
1300
x16297
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16263
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16258
1603A
Di-visible Confusion
constructive algorithms
,
math
,
number theory
1300
x16187
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16163
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x16098
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16083
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x16055
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15976
1612C
Chat Ban
binary search
,
math
1300
x15904
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15890
352B
Jeff and Periods
implementation
,
sortings
1300
x15846
570B
Simple Game
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1300
x15784
1693A
Directional Increase
greedy
1300
x15684
1555B
Two Tables
brute force
1300
x15645
1311C
Perform the Combo
brute force
1300
x15605
1443B
Saving the City
dp
,
greedy
,
math
,
sortings
1300
x15509
1943A
MEX Game 1
games
,
greedy
1300
x15474
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x15436
1077C
Good Array
1300
x15395
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x15293
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15253
1733C
Parity Shuffle Sorting
constructive algorithms
,
sortings
1300
x15137
1260B
Obtain Two Zeroes
binary search
,
math
1300
x15108
1249C1
Good Numbers (easy version)
brute force
,
greedy
,
implementation
1300
x15082
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x15022
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x14951
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x14883
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14772
1217A
Creating a Character
binary search
,
math
1300
x14652
1881D
Divide and Equalize
math
,
number theory
1300
x14628
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14606
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