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→ Pay attention
Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
number theory
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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Custom test
Problems
#
Name
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3407
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3654
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3672
615D
Multipliers
math
,
number theory
2000
x3777
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
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4173
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4450
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5015
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5717
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6187
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7406
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9854
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1266
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1407
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1506
1055C
Lucky Days
math
,
number theory
1900
x1840
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x1864
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1905
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2069
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2528
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2749
359C
Prime Number
math
,
number theory
1900
x2927
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x2944
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3043
1673D
Lost Arithmetic Progression
combinatorics
,
math
,
number theory
1900
x3183
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3327
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3533
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3681
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3684
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3704
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3902
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3929
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4591
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4780
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x4947
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5020
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
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5230
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5235
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5380
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5473
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6134
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6381
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6570
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7795
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x233
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x739
117B
Very Interesting Game
brute force
,
number theory
1800
x1535
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1627
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2076
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2103
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2362
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2513
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2951
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3194
963A
Alternating Sum
math
,
number theory
1800
x3219
1107D
Compression
dp
,
implementation
,
math
,
number theory
1800
x3669
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3671
7C
Line
math
,
number theory
1800
x4212
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4368
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
16C
Monitor
binary search
,
number theory
1800
x4486
1010C
Border
number theory
1800
x4642
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5122
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5214
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5421
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5519
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5533
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5651
1030D
Vasya and Triangle
geometry
,
number theory
1800
x5669
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5733
1848C
Vika and Price Tags
math
,
number theory
1800
x5912
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5978
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6497
1225D
Power Products
hashing
,
math
,
number theory
1800
x7361
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7510
1034A
Enlarge GCD
number theory
1800
x8271
1295D
Same GCDs
math
,
number theory
1800
x8390
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8796
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8843
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9243
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3041
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3583
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3793
678D
Iterated Linear Function
math
,
number theory
1700
x4261
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4558
923A
Primal Sport
math
,
number theory
1700
x4963
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
x5375
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5573
833A
The Meaningless Game
math
,
number theory
1700
x6012
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6434
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6642
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x6763
1114C
Trailing Loves (or L'oeufs?)
brute force
,
implementation
,
math
,
number theory
1700
x7177
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