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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1669
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13442
295A
Greg and Array
data structures
,
implementation
1400
x16511
294E
Shaass the Great
dp
,
trees
2300
x918
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x308
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3738
294B
Shaass and Bookshelf
dp
,
greedy
1700
x4417
294A
Shaass and Oskols
implementation
,
math
800
x22603
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1325
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x236
293C
Cube Problem
brute force
,
math
,
number theory
2400
x561
293B
Distinct Paths
brute force
,
combinatorics
2700
x776
293A
Weird Game
games
,
greedy
1500
x2832
292E
Copying Data
data structures
1900
x3993
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2354
292C
Beautiful IP Addresses
brute force
2000
x992
292B
Network Topology
graphs
,
implementation
1200
x7882
292A
SMSC
implementation
1100
x2667
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1284
291D
Parallel Programming
*special problem
,
greedy
1600
x1468
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1668
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3018
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x6020
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x130
290E
HQ
*special problem
,
constructive algorithms
2500
x198
290D
Orange
*special problem
,
implementation
1400
x1788
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1526
290B
QR code
*special problem
,
implementation
1500
x2414
290A
Mysterious strings
*special problem
,
implementation
1400
x2967
289B
Polo the Penguin and Matrix
brute force
,
dp
,
implementation
,
sortings
,
ternary search
1400
x16953
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x8876
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x287
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x679
288C
Polo the Penguin and XOR operation
implementation
,
math
1700
x2258
288B
Polo the Penguin and Houses
combinatorics
1500
x2869
288A
Polo the Penguin and Strings
greedy
1300
x6449
287B
Pipeline
binary search
,
math
1700
x9180
287A
IQ Test
brute force
,
implementation
1100
x19132
286E
Ladies' Shop
constructive algorithms
,
fft
,
math
2800
x822
286D
Tourists
data structures
,
sortings
2600
x373
286C
Main Sequence
greedy
,
implementation
2100
x1333
286B
Shifting
implementation
2200
x1108
286A
Lucky Permutation
constructive algorithms
,
math
1400
x3133
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x963
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1512
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x22732
285B
Find Marble
implementation
1200
x14845
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13189
284B
Cows and Poker Game
brute force
,
implementation
1000
x6704
284A
Cows and Primitive Roots
implementation
,
math
,
number theory
1400
x6453
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x726
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x528
283C
Coin Troubles
dp
2100
x1285
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3621
283A
Cows and Sequence
constructive algorithms
,
data structures
,
implementation
1600
x6513
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3491
282D
Yet Another Number Game
dp
,
games
2100
x1394
282C
XOR and OR
constructive algorithms
,
implementation
,
math
1500
x9186
282B
Painting Eggs
greedy
,
math
1500
x12689
282A
Bit++
implementation
800
x244156
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2946
281A
Word Capitalization
implementation
,
strings
800
x200800
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x202
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1217
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3618
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4452
280A
Rectangle Puzzle
geometry
2000
x1452
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1418
279D
The Minimum Number of Variables
bitmasks
,
dp
2200
x714
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8124
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x49506
279A
Point on Spiral
brute force
,
geometry
,
implementation
1400
x5536
278B
New Problem
brute force
,
strings
1500
x3427
278A
Circle Line
implementation
800
x11517
277E
Binary Tree on Plane
flows
,
trees
2400
x1248
277D
Google Code Jam
dp
,
probabilities
2800
x331
277C
Game
games
,
implementation
2400
x448
277B
Set of Points
constructive algorithms
,
geometry
2300
x787
277A
Learning Languages
dfs and similar
,
dsu
1400
x18322
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1569
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x13293
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x24842
276B
Little Girl and Game
games
,
greedy
1300
x27705
276A
Lunch Rush
implementation
900
x27015
275B
Convex Shape
constructive algorithms
,
implementation
1700
x2795
275A
Lights Out
implementation
900
x29126
274E
Mirror Room
data structures
,
implementation
3000
x303
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1014
274C
The Last Hole!
brute force
,
geometry
2600
x348
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4928
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x9927
273E
Dima and Game
dp
,
games
2600
x363
273D
Dima and Figure
dp
2400
x388
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1178
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2597
272C
Dima and Staircase
data structures
,
implementation
1500
x6706
272B
Dima and Sequence
implementation
,
math
1400
x3939
272A
Dima and Friends
implementation
,
math
1000
x23896
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x480
271D
Good Substrings
data structures
,
strings
1800
x10639
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