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Before contest
Codeforces Round 941 (Div. 1)
29:14:13
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Before contest
Codeforces Round 941 (Div. 2)
29:14:13
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→ Filter Problems
Difficulty:
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implementation
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
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3411
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3406
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3405
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3384
38B
Chess
brute force
,
implementation
,
math
1200
x3382
818D
Multicolored Cars
data structures
,
implementation
1700
x3381
160C
Find Pair
implementation
,
math
,
sortings
1700
x3380
1427D
Unshuffling a Deck
constructive algorithms
,
implementation
2000
x3361
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3355
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3346
120B
Quiz League
implementation
1100
x3333
55A
Flea travel
implementation
,
math
1200
x3329
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3318
958B1
Maximum Control (easy)
implementation
1000
x3305
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3301
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3296
931C
Laboratory Work
implementation
,
math
1700
x3289
847A
Union of Doubly Linked Lists
implementation
1500
x3289
839B
Game of the Rows
brute force
,
greedy
,
implementation
1900
x3257
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3253
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3252
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3238
245E
Mishap in Club
greedy
,
implementation
1400
x3219
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3203
811C
Vladik and Memorable Trip
dp
,
implementation
1900
x3202
44C
Holidays
implementation
1300
x3197
708B
Recover the String
constructive algorithms
,
greedy
,
implementation
,
math
1900
x3193
69B
Bets
greedy
,
implementation
1200
x3183
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3182
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3178
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3176
825D
Suitable Replacement
binary search
,
greedy
,
implementation
1500
x3173
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x3161
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3150
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3137
863D
Yet Another Array Queries Problem
data structures
,
implementation
1800
x3135
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3132
492D
Vanya and Computer Game
binary search
,
implementation
,
math
,
sortings
1800
x3115
198A
About Bacteria
implementation
,
math
1700
x3101
634A
Island Puzzle
constructive algorithms
,
implementation
1300
x3085
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3083
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3072
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3055
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3054
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3045
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3043
436B
Om Nom and Spiders
implementation
,
math
1400
x3039
1775E
The Human Equation
greedy
,
implementation
2100
x3012
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3000
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2961
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2957
818B
Permutation Game
implementation
1600
x2956
290A
Mysterious strings
*special problem
,
implementation
1400
x2941
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2920
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2919
304B
Calendar
brute force
,
implementation
1300
x2917
730H
Delete Them
constructive algorithms
,
implementation
1300
x2916
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x2913
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2902
271C
Secret
constructive algorithms
,
implementation
1500
x2902
1305E
Kuroni and the Score Distribution
constructive algorithms
,
greedy
,
implementation
,
math
2200
x2899
404B
Marathon
implementation
,
math
1500
x2894
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2894
36A
Extra-terrestrial Intelligence
implementation
1300
x2891
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2889
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2871
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2870
417A
Elimination
dp
,
implementation
,
math
1500
x2864
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2859
665A
Buses Between Cities
implementation
1600
x2859
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2857
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2857
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2843
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2840
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x2839
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2839
887C
Solution for Cube
brute force
,
implementation
1500
x2833
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2832
952C
Ravioli Sort
implementation
1600
x2832
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2826
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2825
1092D2
Great Vova Wall (Version 2)
data structures
,
implementation
2200
x2824
635A
Orchestra
brute force
,
implementation
1100
x2818
491A
Up the hill
constructive algorithms
,
implementation
1000
x2817
29B
Traffic Lights
implementation
1500
x2816
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2810
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2787
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2784
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2782
275B
Convex Shape
constructive algorithms
,
implementation
1700
x2782
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2754
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2749
125B
Simple XML
implementation
1000
x2746
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x2745
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2742
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2731
606B
Testing Robots
implementation
1600
x2730
132A
Turing Tape
implementation
1300
x2725
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