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Before contest
Codeforces Round 941 (Div. 1)
3 days
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Codeforces Round 941 (Div. 2)
3 days
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number theory
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2-sat
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bitmasks
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dfs and similar
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Problems
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Name
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x373
185D
Visit of the Great
math
,
number theory
2600
x378
360D
Levko and Sets
number theory
2600
x384
93E
Lostborn
dp
,
math
,
number theory
2600
x433
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x457
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x494
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x558
1582G
Kuzya and Homework
data structures
,
number theory
2600
x560
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x571
703E
Mishka and Divisors
dp
,
number theory
2600
x585
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x595
982E
Billiard
geometry
,
number theory
2600
x689
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x702
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x737
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x740
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x760
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x806
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x992
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1074
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1176
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1539
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1709
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1798
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x117
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x298
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x467
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x658
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x755
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x757
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x992
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1001
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1037
710D
Two Arithmetic Progressions
math
,
number theory
2500
x1153
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1178
1097F
Alex and a TV Show
bitmasks
,
combinatorics
,
number theory
2500
x1213
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1258
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1264
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1347
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1480
594D
REQ
data structures
,
number theory
2500
x1503
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1556
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2168
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2193
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x2318
55D
Beautiful numbers
dp
,
number theory
2500
x3587
73E
Morrowindows
math
,
number theory
2400
x321
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x332
1045B
Space Isaac
hashing
,
number theory
2400
x487
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x519
293C
Cube Problem
brute force
,
math
,
number theory
2400
x551
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x576
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x616
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x616
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
582C
Superior Periodic Subarrays
number theory
2400
x724
83D
Numbers
dp
,
math
,
number theory
2400
x816
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x852
1007B
Pave the Parallelepiped
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2400
x921
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x944
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x948
585C
Alice, Bob, Oranges and Apples
number theory
2400
x961
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x964
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
17D
Notepad
number theory
2400
x1028
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1061
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1231
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1300
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1346
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1355
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1358
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1406
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1458
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1470
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1504
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1507
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1508
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1649
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1717
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1808
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2041
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3160
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x130
774E
Big Number and Remainder
*special problem
,
math
,
number theory
2300
x206
180B
Divisibility Rules
math
,
number theory
2300
x325
364C
Beautiful Set
brute force
,
number theory
2300
x580
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x857
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x907
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x947
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x997
300E
Empire Strikes Back
binary search
,
math
,
number theory
2300
x1021
915G
Coprime Arrays
math
,
number theory
2300
x1124
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1177
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1180
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1180
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1239
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1366
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1426
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