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Codeforces Round 937 (Div. 4)
00:21:09
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Name
359C
Prime Number
math
,
number theory
1900
x2915
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2940
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2951
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2951
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2957
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3006
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3019
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3037
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3084
1389E
Calendar Ambiguity
math
,
number theory
2200
x3091
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3116
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3132
1673D
Lost Arithmetic Progression
combinatorics
,
math
,
number theory
1900
x3158
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3166
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3182
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x3189
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3199
963A
Alternating Sum
math
,
number theory
1800
x3207
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3245
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3264
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3284
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3289
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3311
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3386
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3499
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3500
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3524
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3525
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3535
55D
Beautiful numbers
dp
,
number theory
2500
x3558
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3614
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3616
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3634
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3643
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3648
1107D
Compression
dp
,
implementation
,
math
,
number theory
1800
x3664
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3690
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3726
615D
Multipliers
math
,
number theory
2000
x3772
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3786
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3882
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3891
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3924
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3931
177B1
Rectangular Game
number theory
1000
x3955
1056B
Divide Candies
math
,
number theory
1600
x4049
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4050
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4094
7C
Line
math
,
number theory
1800
x4127
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4141
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4182
678D
Iterated Linear Function
math
,
number theory
1700
x4191
154B
Colliders
math
,
number theory
1600
x4194
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4271
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4344
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4351
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4354
1195D2
Submarine in the Rybinsk Sea (hard edition)
combinatorics
,
math
,
number theory
1800
x4399
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4403
16C
Monitor
binary search
,
number theory
1800
x4461
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4529
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4567
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4621
375A
Divisible by Seven
math
,
number theory
1600
x4624
1010C
Border
number theory
1800
x4628
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4692
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4693
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4747
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4753
68A
Irrational problem
implementation
,
number theory
1100
x4782
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x4904
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x4940
923A
Primal Sport
math
,
number theory
1700
x4950
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x4952
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x4987
630K
Indivisibility
math
,
number theory
1500
x4989
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x4990
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5066
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5102
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5105
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5144
248B
Chilly Willy
math
,
number theory
1400
x5163
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5180
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5187
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5261
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5337
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5344
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5391
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5392
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5419
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5447
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5484
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5517
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5555
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5622
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5640
1030D
Vasya and Triangle
geometry
,
number theory
1800
x5656
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5684
1184A1
Heidi Learns Hashing (Easy)
brute force
,
math
,
number theory
1200
x5792
1848C
Vika and Price Tags
math
,
number theory
1800
x5824
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