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Codeforces Round (Div. 2)
5 days
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Difficulty:
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constructive algorithms
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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Status
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Custom test
Problems
#
Name
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2302
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x4094
550E
Brackets in Implications
constructive algorithms
,
greedy
,
implementation
,
math
2200
x1543
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3806
549G
Happy Line
constructive algorithms
,
greedy
,
sortings
2200
x2742
549B
Looksery Party
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2300
x1623
547D
Mike and Fish
constructive algorithms
,
dfs and similar
,
graphs
2600
x3432
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x14322
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x9046
543E
Listening to Music
constructive algorithms
,
data structures
3200
x363
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x4696
542C
Idempotent functions
constructive algorithms
,
graphs
,
math
2000
x1307
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x691
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2534
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x19671
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x418
534D
Handshakes
binary search
,
constructive algorithms
,
data structures
,
greedy
1900
x2592
534A
Exam
constructive algorithms
,
implementation
,
math
1100
x13035
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2460
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x2339
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x10391
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x6440
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9613
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x3057
513D2
Constrained Tree
constructive algorithms
,
data structures
2600
x413
513A
Game
constructive algorithms
,
math
800
x22070
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x678
509D
Restoring Numbers
constructive algorithms
,
math
2200
x836
509B
Painting Pebbles
constructive algorithms
,
greedy
,
implementation
1300
x10043
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4707
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x6146
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x6068
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x8251
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x6263
493D
Vasya and Chess
constructive algorithms
,
games
,
math
1700
x10340
491A
Up the hill
constructive algorithms
,
implementation
1000
x3647
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2275
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x3186
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x3355
484A
Bits
bitmasks
,
constructive algorithms
1700
x14005
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x8697
482A
Diverse Permutation
constructive algorithms
,
greedy
1200
x10375
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x8567
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x42640
476D
Dreamoon and Sets
constructive algorithms
,
greedy
,
math
1900
x5143
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x867
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x319
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x154
468C
Hack it!
binary search
,
constructive algorithms
,
math
2500
x2858
468A
24 Game
constructive algorithms
,
greedy
,
math
1500
x8698
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x44326
460D
Little Victor and Set
brute force
,
constructive algorithms
,
math
2300
x1063
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6545
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x136
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1862
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x2138
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2653
443A
Anton and Letters
constructive algorithms
,
implementation
800
x118712
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1273
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x12128
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x4211
432E
Square Tiling
constructive algorithms
,
greedy
2300
x825
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2440
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x1068
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x644
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x7043
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x1007
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x5143
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x10660
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x9654
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x6478
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x22167
398C
Tree and Array
constructive algorithms
x226
398A
Cards
constructive algorithms
,
implementation
x970
397B
On Corruption and Numbers
constructive algorithms
,
implementation
,
math
x838
394C
Dominoes
constructive algorithms
,
greedy
x563
390D
Inna and Sweet Matrix
constructive algorithms
x539
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2624
379B
New Year Present
constructive algorithms
,
implementation
1200
x7654
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x730
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1772
369B
Valera and Contest
constructive algorithms
,
implementation
,
math
1400
x6948
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x8935
361A
Levko and Table
constructive algorithms
,
implementation
800
x18038
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x565
359B
Permutation
constructive algorithms
,
dp
,
math
1400
x8852
359A
Table
constructive algorithms
,
greedy
,
implementation
1000
x9364
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x2358
357B
Flag Day
constructive algorithms
,
implementation
1400
x8623
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x1183
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1423
355A
Vasya and Digital Root
constructive algorithms
,
implementation
1100
x9947
354E
Lucky Number Representation
constructive algorithms
,
dfs and similar
,
dp
2200
x940
353D
Queue
constructive algorithms
,
dp
2000
x3241
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2453
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x896
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x9929
341E
Candies Game
constructive algorithms
,
greedy
3000
x629
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x613
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8861
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