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Before contest
Codeforces Round 941 (Div. 1)
3 days
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Before contest
Codeforces Round 941 (Div. 2)
3 days
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number theory
combine-tags-by-or
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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
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geometry
graph matchings
graphs
greedy
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interactive
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probabilities
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Problems
#
Name
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2866
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2927
359C
Prime Number
math
,
number theory
1900
x2928
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2951
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x2959
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2966
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2966
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2981
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3020
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3041
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3043
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3093
1389E
Calendar Ambiguity
math
,
number theory
2200
x3106
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3137
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3160
1673D
Lost Arithmetic Progression
combinatorics
,
math
,
number theory
1900
x3183
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3194
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x3201
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3212
963A
Alternating Sum
math
,
number theory
1800
x3219
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3240
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3269
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3271
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3294
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3330
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3358
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3407
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3506
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3515
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3533
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3583
55D
Beautiful numbers
dp
,
number theory
2500
x3586
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3643
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3655
1107D
Compression
dp
,
implementation
,
math
,
number theory
1800
x3669
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3673
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3673
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3682
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3684
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3704
615D
Multipliers
math
,
number theory
2000
x3777
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3793
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3906
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3916
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3930
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3962
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3976
177B1
Rectangular Game
number theory
1000
x3980
1056B
Divide Candies
math
,
number theory
1600
x4062
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4074
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4173
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4204
7C
Line
math
,
number theory
1800
x4213
154B
Colliders
math
,
number theory
1600
x4222
678D
Iterated Linear Function
math
,
number theory
1700
x4261
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4285
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4328
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4368
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4403
1195D2
Submarine in the Rybinsk Sea (hard edition)
combinatorics
,
math
,
number theory
1800
x4411
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4451
16C
Monitor
binary search
,
number theory
1800
x4486
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4560
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4592
1010C
Border
number theory
1800
x4643
375A
Divisible by Seven
math
,
number theory
1600
x4645
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4646
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4709
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4729
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4763
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4780
68A
Irrational problem
implementation
,
number theory
1100
x4794
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x4925
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x4947
923A
Primal Sport
math
,
number theory
1700
x4963
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x4998
630K
Indivisibility
math
,
number theory
1500
x5013
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5016
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5022
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5093
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5121
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5123
248B
Chilly Willy
math
,
number theory
1400
x5186
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5214
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5230
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5235
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5275
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5376
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5381
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5422
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5435
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5474
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5521
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5533
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5539
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5573
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5652
1030D
Vasya and Triangle
geometry
,
number theory
1800
x5672
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5717
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