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Educational Codeforces Round 165 (Rated for Div. 2)
23:51:26
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Difficulty:
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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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Custom test
Problems
#
Name
527E
Data Center Drama
dfs and similar
,
graphs
2600
x1803
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4645
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6646
527B
Error Correct System
greedy
1500
x3855
527A
Playing with Paper
implementation
,
math
1100
x14081
526G
Spiders Evil Plan
greedy
,
trees
3300
x689
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2303
526E
Transmitting Levels
dp
,
implementation
2400
x1052
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2094
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2261
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4465
526A
King of Thieves
brute force
,
implementation
1300
x4724
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2723
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1632
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5695
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9175
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13836
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1151
524D
Social Network
greedy
,
two pointers
2100
x939
524C
The Art of Dealing with ATM
binary search
,
sortings
1900
x1979
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1444
524A
Возможно, вы знаете этих людей?
implementation
1600
x1392
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2240
523C
Name Quest
*special problem
,
greedy
1400
x2466
523B
Mean Requests
*special problem
,
implementation
1500
x940
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2566
522D
Closest Equals
*special problem
,
data structures
2000
x2941
522C
Chicken or Fish?
greedy
2100
x708
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8645
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15694
521E
Cycling City
dfs and similar
,
graphs
3100
x916
521D
Shop
greedy
2800
x1481
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1793
520D
Cubes
games
,
greedy
,
implementation
2100
x1532
520C
DNA Alignment
math
,
strings
1500
x4082
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x47764
520A
Pangram
implementation
,
strings
800
x89433
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6162
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6269
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19316
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x37624
519A
A and B and Chess
implementation
900
x18550
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x348
518E
Arthur and Questions
greedy
,
implementation
,
math
,
ternary search
2200
x905
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6672
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x5919
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7795
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9106
516E
Drazil and His Happy Friends
math
,
number theory
3100
x471
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1222
515E
Drazil and Park
data structures
2300
x2052
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2759
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x24904
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7357
515A
Drazil and Date
math
1000
x19518
514E
Darth Vader and Tree
dp
,
matrices
2200
x1364
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4105
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6448
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20140
514A
Chewbaсca and Number
greedy
,
implementation
1200
x45428
513G3
Inversions problem
dp
3100
x251
513G2
Inversions problem
dp
,
probabilities
2400
x626
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1754
513F2
Scaygerboss
flows
2800
x313
513F1
Scaygerboss
flows
2700
x295
513E2
Subarray Cuts
dp
2700
x543
513E1
Subarray Cuts
dp
2600
x465
513D2
Constrained Tree
constructive algorithms
,
data structures
2600
x365
513D1
Constrained Tree
dfs and similar
2400
x425
513C
Second price auction
bitmasks
,
probabilities
2000
x1516
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2561
513B1
Permutations
brute force
1400
x3575
513A
Game
constructive algorithms
,
math
800
x19918
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x500
512D
Fox And Travelling
dp
,
trees
2900
x929
510E
Fox And Dinner
flows
2300
x2140
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5170
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x15040
510B
Fox And Two Dots
dfs and similar
1500
x13378
510A
Fox And Snake
implementation
800
x76673
509F
Progress Monitoring
dp
,
trees
2300
x861
509E
Pretty Song
math
,
strings
2000
x1768
509D
Restoring Numbers
constructive algorithms
,
math
2200
x731
509C
Sums of Digits
dp
,
greedy
,
implementation
2000
x1997
509B
Painting Pebbles
constructive algorithms
,
greedy
,
implementation
1300
x9514
509A
Maximum in Table
brute force
,
implementation
800
x37192
508E
Arthur and Brackets
dp
,
greedy
2200
x1529
508D
Tanya and Password
dfs and similar
,
graphs
2500
x3081
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4410
508B
Anton and currency you all know
greedy
,
math
,
strings
1300
x22042
508A
Pasha and Pixels
brute force
1100
x7788
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2589
507D
The Maths Lecture
dp
,
implementation
2200
x1680
507C
Guess Your Way Out!
implementation
,
math
,
trees
1700
x4273
507B
Amr and Pins
geometry
,
math
1400
x23796
507A
Amr and Music
greedy
,
implementation
,
sortings
1000
x16968
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x683
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2025
505E
Mr. Kitayuta vs. Bamboos
binary search
,
greedy
2900
x1324
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