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Codeforces Round 941 (Div. 1)
2 days
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Codeforces Round 941 (Div. 2)
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Problems
#
Name
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1384
10C
Digital Root
number theory
2000
x1389
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1406
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1407
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1426
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1444
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1458
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1460
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1470
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1480
594D
REQ
data structures
,
number theory
2500
x1503
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1504
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1506
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1507
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1509
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1512
117B
Very Interesting Game
brute force
,
number theory
1800
x1535
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1536
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1539
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1557
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2300
x1574
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1628
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1639
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1645
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1649
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1670
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1681
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1684
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1709
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1718
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1722
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1767
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1782
1510D
Digits
dp
,
math
,
number theory
2100
x1791
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1791
78C
Beaver Game
dp
,
games
,
number theory
2000
x1798
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1799
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1808
919E
Congruence Equation
chinese remainder theorem
,
math
,
number theory
2100
x1819
1055C
Lucky Days
math
,
number theory
1900
x1840
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x1871
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1906
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1951
906D
Power Tower
chinese remainder theorem
,
math
,
number theory
2700
x1965
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x1971
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x1972
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x1973
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x1983
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2003
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2015
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2036
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2039
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2039
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2040
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2041
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2069
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2078
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2088
776E
The Holmes Children
math
,
number theory
2100
x2097
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2104
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2156
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2170
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2171
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2193
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2211
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x2259
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2285
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2289
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2292
1033D
Divisors
interactive
,
math
,
number theory
2000
x2302
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x2329
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2362
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2400
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2405
955C
Sad powers
binary search
,
math
,
number theory
2100
x2452
1717E
Madoka and The Best University
math
,
number theory
2200
x2456
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2466
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x2506
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2513
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2521
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2528
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
1097D
Makoto and a Blackboard
dp
,
math
,
number theory
,
probabilities
2200
x2557
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2574
1334E
Divisor Paths
combinatorics
,
graphs
,
greedy
,
math
,
number theory
2200
x2587
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2613
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2639
1731E
Graph Cost
dp
,
greedy
,
math
,
number theory
2000
x2643
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2653
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x2653
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2661
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2682
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2685
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2700
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2749
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2749
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2770
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2773
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2778
177B2
Rectangular Game
number theory
1200
x2824
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