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Before contest
Codeforces Round 941 (Div. 1)
12:20:35
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
12:20:35
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combinatorics
combine-tags-by-or
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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
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number theory
probabilities
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
#
Name
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1654
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1643
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1640
840C
On the Bench
combinatorics
,
dp
2500
x1637
997C
Sky Full of Stars
combinatorics
,
math
2500
x1629
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1629
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1619
712D
Memory and Scores
combinatorics
,
dp
,
math
2200
x1611
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1608
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1605
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1603
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1602
489F
Special Matrices
combinatorics
,
dp
2100
x1595
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1590
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1578
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2300
x1575
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1567
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1549
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1533
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1522
1866H
Happy Sets
combinatorics
2100
x1518
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1513
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1506
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1506
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1474
156D
Clues
combinatorics
,
graphs
2500
x1464
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1463
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1460
1227F2
Wrong Answer on test 233 (Hard Version)
combinatorics
,
math
2400
x1458
1197E
Culture Code
binary search
,
combinatorics
,
data structures
,
dp
,
shortest paths
,
sortings
2300
x1452
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1448
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1443
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1431
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1417
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x1409
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1405
1942E
Farm Game
combinatorics
,
games
2300
x1397
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1395
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1388
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1386
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1381
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1368
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1361
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1359
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1357
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1349
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1349
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1346
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1340
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1291
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1283
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1266
1109D
Sasha and Interesting Fact from Graph Theory
brute force
,
combinatorics
,
dp
,
math
,
trees
2400
x1264
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1264
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1246
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1243
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1229
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1226
938E
Max History
combinatorics
,
math
2300
x1223
1097F
Alex and a TV Show
bitmasks
,
combinatorics
,
number theory
2500
x1213
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1209
690D2
The Wall (medium)
combinatorics
1800
x1208
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1190
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1184
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1180
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1171
1264D1
Beautiful Bracket Sequence (easy version)
combinatorics
,
dp
,
probabilities
2600
x1170
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1162
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1159
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1149
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1141
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1139
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1135
995F
Cowmpany Cowmpensation
combinatorics
,
dp
,
math
,
trees
2700
x1119
1666F
Fancy Stack
combinatorics
,
dp
,
implementation
2200
x1103
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x1094
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1093
895D
String Mark
combinatorics
,
math
,
strings
2100
x1086
1307E
Cow and Treats
binary search
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
2500
x1075
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1074
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1063
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1063
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1061
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1061
360C
Levko and Strings
combinatorics
,
dp
2500
x1055
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1041
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1040
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1028
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1022
1065E
Side Transmutations
combinatorics
,
strings
2300
x1017
1526E
Oolimry and Suffix Array
combinatorics
,
constructive algorithms
,
math
2400
x1016
1295F
Good Contest
combinatorics
,
dp
,
probabilities
2700
x1007
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x998
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x996
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x981
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x974
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x974
886E
Maximum Element
combinatorics
,
dp
,
math
2400
x972
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x966
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x965
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