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Before contest
Codeforces Round 937 (Div. 4)
03:11:53
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Difficulty:
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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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Problems
#
Name
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1432
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2300
x1558
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1597
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1629
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1759
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x1960
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x1961
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x1993
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x1996
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2013
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2019
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2046
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2137
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2148
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2287
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x2493
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2505
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2616
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2671
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3181
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4182
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x475
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x540
1575G
GCD Festival
math
,
number theory
2200
x635
45G
Prime Problem
number theory
2200
x983
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1001
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1182
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1239
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1440
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x1536
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1657
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1660
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1671
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1786
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1925
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x1974
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2199
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2215
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x2244
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2274
1717E
Madoka and The Best University
math
,
number theory
2200
x2430
1097D
Makoto and a Blackboard
dp
,
math
,
number theory
,
probabilities
2200
x2543
1334E
Divisor Paths
combinatorics
,
graphs
,
greedy
,
math
,
number theory
2200
x2580
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2591
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x2618
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2663
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2751
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3006
1389E
Calendar Ambiguity
math
,
number theory
2200
x3091
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3891
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x4903
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6084
306C
White, Black and White Again
combinatorics
,
number theory
2100
x434
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x532
225E
Unsolvable
math
,
number theory
2100
x772
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x923
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x928
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x944
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1059
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1375
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1713
1510D
Digits
dp
,
math
,
number theory
2100
x1780
919E
Congruence Equation
chinese remainder theorem
,
math
,
number theory
2100
x1810
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x1962
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2031
776E
The Holmes Children
math
,
number theory
2100
x2071
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2389
955C
Sad powers
binary search
,
math
,
number theory
2100
x2441
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2625
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2632
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2706
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2730
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2758
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2877
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x2951
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3114
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3244
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3264
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3288
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3310
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3616
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4049
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4691
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5391
474F
Ant colony
data structures
,
math
,
number theory
2100
x7528
216E
Martian Luck
math
,
number theory
2000
x539
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1007
10C
Digital Root
number theory
2000
x1383
78C
Beaver Game
dp
,
games
,
number theory
2000
x1790
1033D
Divisors
interactive
,
math
,
number theory
2000
x2284
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2303
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2452
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2550
1731E
Graph Cost
dp
,
greedy
,
math
,
number theory
2000
x2597
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2839
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2950
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2957
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x3189
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3199
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3386
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